KR20120136888A - Secondary battery of novel structure - Google Patents
Secondary battery of novel structure Download PDFInfo
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- KR20120136888A KR20120136888A KR1020110056082A KR20110056082A KR20120136888A KR 20120136888 A KR20120136888 A KR 20120136888A KR 1020110056082 A KR1020110056082 A KR 1020110056082A KR 20110056082 A KR20110056082 A KR 20110056082A KR 20120136888 A KR20120136888 A KR 20120136888A
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- secondary battery
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- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
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Abstract
Description
본 발명은 신규한 구조의 이차전지에 관한 것으로서, 더욱 상세하게는 전지케이스에 양극/분리막/음극 구조의 전극조립체를 수납하고 열융착에 의해 외주면을 밀봉한 이차전지로서, 내부 실란트층/금속 배리어 층/외부 수지층의 단면 구조로 이루어진 밀봉부의 단면을 포함하는 전지케이스의 외주면 전부에 외부로부터 수분의 유입을 방지하고 절연저항이 향상되도록, 전기 절연성의 고분자 코팅층이 형성되어 있는 것을 특징으로 하는 이차전지에 관한 것이다.The present invention relates to a secondary battery having a novel structure, and more particularly, a secondary battery in which an electrode assembly of a cathode / separation membrane / cathode structure is housed in a battery case and sealed on an outer circumferential surface by thermal fusion, and includes an inner sealant layer / metal barrier. An electrically insulating polymer coating layer is formed on all of the outer circumferential surfaces of the battery case including the end face of the sealing part having the cross-sectional structure of the layer / outer resin layer to prevent the inflow of moisture from the outside and to improve the insulation resistance. It relates to a battery.
모바일 기기에 대한 기술 개발과 수요가 증가함에 따라 에너지원으로서의 이차전지의 수요가 급격히 증가하고 있고, 그러한 이차전지 중 높은 에너지 밀도와 방전 전압의 리튬 이차전지에 대해 많은 연구가 행해졌고 또한 상용화되어 널리 사용되고 있다.As technology development and demand for mobile devices have increased, the demand for secondary batteries as energy sources has been rapidly increasing. Many researches have been conducted on lithium secondary batteries with high energy density and discharge voltage among such secondary batteries. .
리튬 이차전지는 그것의 외형에 따라 크게 원통형 전지, 각형 전지, 파우치형 전지 등으로 분류되며, 전해액의 형태에 따라 리튬이온 전지, 리튬이온 폴리머 전지, 리튬 폴리머 전지 등으로 분류되기도 한다.Lithium secondary batteries are largely classified into cylindrical batteries, square batteries, pouch-type batteries, and the like according to their appearance, and may be classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, and the like depending on the type of electrolyte.
모바일 기기의 소형화에 대한 최근의 경향으로 인해, 두께가 얇은 각형 전지, 파우치형 전지에 대한 수요가 증가하고 있으며, 특히, 형태의 변형이 용이하고 제조비용이 저렴하며 중량이 작은 파우치형 전지에 대한 관심이 높은 실정이다.Due to the recent trend toward the miniaturization of mobile devices, there is an increasing demand for thinner rectangular batteries and pouch-type batteries. In particular, for pouch-type batteries that are easy to deform, low in manufacturing cost and light in weight. Interest is high.
일반적으로, 파우치형 전지는 라미네이트 시트의 파우치형 케이스 내부에 전극조립체와 전해질이 수납되고, 케이스의 외곽이 밀봉되어 있는 전지를 말한다. In general, a pouch type battery refers to a battery in which an electrode assembly and an electrolyte are housed inside a pouch type case of a laminate sheet, and the outside of the case is sealed.
도 1을 참조하면 라미네이트 시트(10)는 최외곽을 이루는 외부 수지층(11), 물질의 관통을 방지하는 금속 배리어층(12), 접착층(13), 및 밀봉을 위한 내부 실란트층(14)으로 구성되어 있다. 경우에 따라서는, 접착층(13)이 포함되지 않을 수도 있다.Referring to FIG. 1, the
금속 배리어층은 파우치형 전지의 기계적 강도를 향상시키고, 공기, 습기 등과 같은 외부 불순물들이 전지의 내부로 유입되는 것을 방지하며 알루미늄 시트가 주로 사용된다. The metal barrier layer improves the mechanical strength of the pouch-type battery, prevents foreign impurities such as air, moisture, and the like from entering the inside of the battery, and an aluminum sheet is mainly used.
그러나, 상기 알루미늄 시트는 파우치형 케이스의 외곽의 단면 및 가스배출(degassing) 부위에서 외부로 직접 노출되어 있으므로, 이 경우 밀봉부의 절연저항이 저하될 수 있는 문제가 있다. 특히, 전극 탭들이 노출된 부위에서는 외력 인가시 전극 탭들이 알루미늄 시트와 직접 접촉되어 단락을 일으킬 수 있다.However, since the aluminum sheet is directly exposed to the outside from the cross section of the outer portion of the pouch type case and the degassing portion, there is a problem that the insulation resistance of the sealing portion may be lowered. In particular, the electrode tabs may be in direct contact with the aluminum sheet and may cause a short circuit when an external force is applied at the portions where the electrode tabs are exposed.
또한, 수분 차단성이 없는 외부 피복층이 상기 외곽 단면 및 디개싱 부위에서 외부에 직접적으로 노출되므로, 전지 내부로 수분이 유입되어, 수명특성의 저하, 장기 보관특성의 저하와 같은 문제를 일으킬 수 있다.In addition, since the outer coating layer having no moisture barrier property is directly exposed to the outside at the outer cross section and the degassing portion, moisture may flow into the battery, causing problems such as deterioration of life characteristics and deterioration of long-term storage characteristics. .
따라서, 상기와 같은 전지 성능이 저하되는 문제를 근본적으로 방지하고, 전지의 안정성을 확보할 수 있는 기술에 대한 필요성이 높은 실정이다.Therefore, there is a high need for a technology capable of fundamentally preventing the above-described problem of deterioration of battery performance and securing battery stability.
특히, 전기자동차, 하이브리드 자동차 등의 전원으로서 중대형 전지팩에 사용되는 이차전지는 장기간의 수명이 필요하고 다수의 전지셀들이 밀집되는 특성상 안전성 확보가 매우 중요하다.In particular, a secondary battery used in a medium-large battery pack as a power source of an electric vehicle, a hybrid vehicle, etc. needs a long lifespan, and it is very important to secure safety due to the fact that many battery cells are concentrated.
또한, 전지는 전지케이스가 자체로 높은 기계적 강성을 발휘할 수 있을 때, 침상 관통 등에 대해 우수한 저항성을 발휘할 수 있고, 다수의 전지들을 사용하여 중대형 전지팩을 구성할 때 우수한 구조적 안정성을 발휘할 수 있다.In addition, when the battery case can exhibit high mechanical rigidity by itself, the battery can exhibit excellent resistance against needle penetration and the like, and can exhibit excellent structural stability when constructing a medium-large battery pack using a plurality of batteries.
전지케이스에 상기와 같은 기계적 강성을 제공하는 하나의 방안으로는 동일한 소재에서 전지케이스의 두께를 두껍게 구성하는 것이지만, 이 경우, 전지의 경량화와 전지의 조립 특성이 저하되므로, 바람직하지 않다.One method of providing the above-mentioned mechanical rigidity to the battery case is to configure the thickness of the battery case thickly from the same material, but in this case, the weight of the battery and the assembly characteristics of the battery are deteriorated, which is not preferable.
따라서, 상기와 같은 안전성과 안정성을 모두 만족시킬 수 있는 이차전지에 대한 수요가 높다.Therefore, there is a high demand for a secondary battery that can satisfy both the above safety and stability.
본 발명은 상기와 같은 종래기술의 문제점과 과거로부터 요청되어온 기술적 과제를 해결하는 것을 목적으로 한다.SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the prior art and the technical problems required from the past.
본원의 발명자들은 라미네이트 시트 단면을 포함한 파우치 케이스의 외주면 전부에 전기 절연층 또는 기계적 강성이 향상된 전기 절연층을 코팅시키거나, 선택적으로, 서로 다른 물성을 갖는 코팅층을 형성시키는 경우, 라미네이트 시트 단면의 노출 가능성을 최소화하여 안전성을 담보하면서, 얇은 두께에도 불구하고 우수한 기계적 특성을 발휘할 수 있고, 특정 부위에만 선택적으로 절연층을 코팅시키는 경우에 비해 제조공정성이 향상됨을 확인하고 본 발명을 완성하게 되었다.When the inventors of the present invention coat an electrical insulating layer or an electrical insulating layer having improved mechanical rigidity on all of the outer circumferential surface of the pouch case including the laminate sheet cross section, or optionally, forming a coating layer having different physical properties, the laminate sheet cross section is exposed. While minimizing the possibility and ensuring safety, excellent mechanical properties can be exhibited despite the thin thickness, and compared to the case where the insulating layer is selectively coated only on a specific site, the manufacturing processability is improved and the present invention has been completed.
따라서, 본 발명에 따른 이차전지는 전지케이스에 양극/분리막/음극 구조의 전극조립체를 수납하고 열융착에 의해 외주면을 밀봉한 이차전지로서, 내부 실란트층/금속 배리어 층/외부 수지층의 단면 구조로 이루어진 밀봉부의 단면을 포함하는 전지케이스의 외주면 전부에 외부로부터 수분의 유입을 방지하고 절연저항이 향상되도록, 전기 절연성의 고분자 코팅층이 형성되어 있는 것을 특징으로 한다.Accordingly, the secondary battery according to the present invention is a secondary battery in which an electrode assembly of a cathode / separation membrane / cathode structure is housed in a battery case and sealed an outer circumferential surface by thermal fusion, and has a cross-sectional structure of an inner sealant layer, a metal barrier layer, and an outer resin layer. An electrically insulating polymer coating layer is formed on all of the outer circumferential surfaces of the battery case including the end surface of the sealing part to prevent the inflow of moisture from the outside and to improve the insulation resistance.
따라서, 본 발명에 따른 이차전지는 전지케이스의 외주면 전부에 전기 절연층을 형성시킴으로써 라미네이트 시트 단면의 절연저항을 향상시키는 동시에 외부로부터 수분이 유입되는 것을 방지하여 수명특성, 장기 보관특성을 향상시키는 효과를 발휘한다. Therefore, the secondary battery according to the present invention improves the insulation resistance of the cross section of the laminate sheet by forming an electrical insulation layer on the entire outer circumferential surface of the battery case and prevents water from flowing in from the outside, thereby improving the life characteristics and long-term storage characteristics. Exert.
상기 전극조립체로부터 연장되어 외부로 노출되어 있는 전극 탭들이 전지케이스와 접하는 접합단면의 전극 탭들의 상하면에는 절연성 필름 층이 더 형성되어 있을 수 있다.An insulating film layer may be further formed on the upper and lower surfaces of the electrode tabs of the junction section in which the electrode tabs extending from the electrode assembly and exposed to the outside are in contact with the battery case.
일반적으로, 양극 탭은 알루미늄 시트로 이루어지고, 음극 탭은 구리 시트로 이루어지므로, 열융착 시 전극 탭들이 형성된 부위는 밀봉력이 저하된다. 따라서, 전극 탭들이 형성된 부위에는 밀봉성이 향상되도록 절연테이프로 전극 탭들의 상하면을 감쌀 수 있다. In general, since the positive electrode tab is made of an aluminum sheet and the negative electrode tab is made of a copper sheet, the sealing force is deteriorated in a portion where the electrode tabs are formed during thermal welding. Therefore, the upper and lower surfaces of the electrode tabs may be wrapped around the electrode tabs with insulating tape to improve sealing.
상기 고분자 코팅층은, 다음의 예로 한정되는 것은 아니지만, 바람직하게는, 폴리부틸렌테레프탈레이트(PBT), 폴리에틸렌테레프탈레이트(PET), 아로마틱 폴리아마이드, 폴리아마이드(PA), 폴리카보네이트(PC), 폴리스티렌(PS), 폴리페닐렌설파이드(PPS), 열방성 액정고분자, 폴리술폰, 폴리에테르술폰(PES), 폴리에테르이미드(PEI), 폴리에테르에테르케톤(PEEK), 폴리아릴레이트, 폴리메틸메틸아크릴레이트(PMMA), 폴리비닐알코올(PVA), 폴리프로필렌(PP), 폴리에틸렌(PE), 폴리아크릴로니트릴-부타디엔스타이렌 공중합체(PAN-PB-PS), 폴리테트라메틸렌옥사이드-1,4-부탄디올 공중합체(폴리부틸렌테레프랄레이트 탄성체), 스티렌을 포함하는 공중합체, 불소계 수지, 폴리비닐클로라이드(PVC), 및 폴리아크릴로니트릴(PAN)로 이루어진 군으로부터 선택된 하나 이상이 것으로 이루어질 수 있다. The polymer coating layer is not limited to the following examples, but preferably, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), aromatic polyamide, polyamide (PA), polycarbonate (PC), polystyrene (PS), polyphenylene sulfide (PPS), thermotropic liquid crystal polymer, polysulfone, polyether sulfone (PES), polyetherimide (PEI), polyether ether ketone (PEEK), polyarylate, polymethylmethylacrylic Rate (PMMA), polyvinyl alcohol (PVA), polypropylene (PP), polyethylene (PE), polyacrylonitrile-butadiene styrene copolymer (PAN-PB-PS), polytetramethylene oxide-1,4- At least one selected from the group consisting of butanediol copolymer (polybutylene terephthalate elastomer), copolymer comprising styrene, fluorine resin, polyvinyl chloride (PVC), and polyacrylonitrile (PAN) Can be done.
상기 고분자 층의 두께는 밀봉부 단면의 두께 대비 1% 내지 20%인 것이 바람직한 바, 상기 고분자 층의 두께가 밀봉부 단면 두께 대비 너무 작은 경우에는 소망하는 기계적 강성을 얻을 수 없고, 반대로 너무 큰 경우에는 파우치형 이차전지의 두께가 두꺼워지므로 바람직하지 않다. 더욱 바람직한 두께는 1% 내지 10%일 수 있다.It is preferable that the thickness of the polymer layer is 1% to 20% of the thickness of the cross section of the seal. If the thickness of the polymer layer is too small compared to the thickness of the seal section, the desired mechanical rigidity cannot be obtained. Is not preferable because the thickness of the pouch type secondary battery becomes thick. More preferred thickness may be 1% to 10%.
또한, 상기 고분자 층은 전극 탭의 길이 대비 30 내지 50%에 대응하는 길이만큼 전지케이스의 외주면을 감싸는 것이 바람직하다. In addition, the polymer layer preferably surrounds the outer circumferential surface of the battery case by a length corresponding to 30 to 50% of the length of the electrode tab.
상기 전극조립체는 양극과 음극 및 그 사이에 개재되어 있는 분리막으로 이루어진 구조라면 특별히 제한되지 않으며, 예를 들어, 폴딩형, 스택형 또는 스택/폴딩형 구조를 들 수 있다. 스택/폴딩형 구조의 전극조립체에 대한 자세한 내용은 본 출원인의 한국 특허출원공개 제2001-0082058호, 제2001-0082059호 및 제2001-0082060호에 개시되어 있으며, 상기 출원은 본 발명의 내용에 참조로서 합체된다.The electrode assembly is not particularly limited as long as it is a structure consisting of a cathode and an anode, and a separator interposed therebetween, and examples thereof include a folding type, a stack type, or a stack / folding type structure. Details of the electrode assembly of the stack / foldable structure are disclosed in Korean Patent Application Publication Nos. 2001-0082058, 2001-0082059, and 2001-0082060, which are described in the context of the present invention. Incorporated by reference.
본 발명은 또한, 상기와 같이 파우치형 이차전지의 외주면 전부에 절연성의 고분자 코팅층이 형성된 이차전지의 제조방법을 제공한다.The present invention also provides a method of manufacturing a secondary battery in which an insulating polymer coating layer is formed on all of the outer circumferential surface of the pouch type secondary battery.
구체적으로, 상기 제조방법은,Specifically, the manufacturing method,
내부 실란트층/금속 배리어 층/외부 수지층의 단면 구조로 이루어진 파우치형 전지케이스의 수납부에 양극/분리막/음극 구조의 전극조립체를 수납하는 과정; 전지케이스의 외주면 밀봉부를 고온의 실링 툴로 압착하여 융점이 낮은 내부 실란트층을 용융 및 상호 접착시켜 밀봉하는 과정; 상기 밀봉 이후에 파우치 형 이차전지 내의 가스를 외부로 배출시킨 후 전기 절연성을 갖는 코팅물질로 코팅하는 과정; 을 포함하는 것으로 구성될 수 있다. Storing an electrode assembly having a positive electrode / separation membrane / cathode structure in a pouch-type battery case accommodating a cross-sectional structure of an inner sealant layer / metal barrier layer / outer resin layer; Pressing the outer circumferential surface sealing portion of the battery case with a high-temperature sealing tool to melt and mutually bond and seal the inner sealant layer having a low melting point; Discharging the gas in the pouch-type secondary battery to the outside after the sealing, and then coating the coating material with electrical insulation; As shown in FIG.
하나의 바람직한 예에서, 상기 코팅과정은, In one preferred embodiment, the coating process,
파우치형 전지케이스 내에 수납되어 밀봉된 이차전지에 전압을 연결하고 충방전 사이클을 실시하여 활성화시키는 활성화 과정; 가스 포집부의 일측 단부를 천공하여 가스를 제거하는 디개싱 과정; 상기 천공부를 다시 밀봉시키는 리실링 과정; 및 An activation process of connecting a voltage to the sealed secondary battery contained in the pouch-type battery case and activating it by performing a charge / discharge cycle; A degassing process of removing gas by puncturing one end of the gas collecting part; A resealing process of resealing the perforations; And
코팅물질로 파우치형 케이스의 외주면을 코팅하는 과정; 을 포함하는 것으로 구성될 수 있다. Coating an outer circumferential surface of the pouch type case with a coating material; As shown in FIG.
이때, 상기 코팅은 특정한 코팅법으로 한정되는 것은 아니나, 바람직하게는 딥-코팅법(dip-coating), 스프레이 코팅법 등에 의해 수행될 수 있다. In this case, the coating is not limited to a specific coating method, but may be preferably performed by dip-coating, spray coating, or the like.
본 발명에 따른 이차전지는 바람직하게는 리튬 이차전지일 수 있으며, 특히, 리튬 함유 전해액이 겔의 형태로 전극조립체에 함침되어 있는, 이른바, 리튬 이온 폴리머 전지에 바람직하게 적용될 수 있다.The secondary battery according to the present invention may preferably be a lithium secondary battery, and particularly, may be preferably applied to a so-called lithium ion polymer battery in which a lithium-containing electrolyte is impregnated into the electrode assembly in the form of a gel.
본 발명은 또한 상기 이차전지를 단위전지로서 포함하고 있는 중대형 전지모듈을 제공한다.The present invention also provides a medium-large battery module including the secondary battery as a unit cell.
본 발명에 따른 이차전지는, 특히, 장시간의 수명과 우수한 내구성이 요구되는 고출력 대용량의 전지, 또는 이러한 전지를 단위전지로서 다수 개 포함하는 중대형 전지모듈에 바람직하게 사용될 수 있다. 상기 중대형 전지모듈은, 예를 들어, 전기자동차, 하이브리드 전기자동차, 플러그-인 하이브리드 전기자동차, 전력저장장치 등의 동력원으로 사용될 수 있다.The secondary battery according to the present invention can be preferably used for a high output large capacity battery which requires a long service life and excellent durability or a middle or large battery module including a plurality of such batteries as a unit battery. The medium-large battery module may be used as a power source of, for example, an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.
이러한 중대형 전지모듈의 구조 및 제조방법은 당업계에 공지되어 있으므로, 그에 대한 자세한 설명을 본 명세서에서는 생략한다. Since the structure and manufacturing method of such a medium-large battery module are well known in the art, a detailed description thereof will be omitted herein.
이상에서 설명한 바와 같이, 본 발명에 따른 이차전지는 전지케이스의 외주면 전부에 전기 절연층을 형성시킴으로써 라미네이트 시트 단면의 절연저항을 향상시키는 동시에 외부로부터 수분이 유입되는 것을 방지하여 수명특성, 장기 보관특성을 향상시키는 효과를 발휘한다. As described above, the secondary battery according to the present invention improves the insulation resistance of the cross section of the laminate sheet by forming an electrical insulation layer on all of the outer circumferential surface of the battery case and at the same time prevents the inflow of moisture from the outside life and long-term storage characteristics Exert the effect of improving.
본 발명은 무기물 입자의 첨가에 의해 기계적 강성이 향상되므로, 침상관통과 같은 외력에 의한 이차전지의 안전성을 향상시키기 위해서 별도의 셀 케이스를 사용하지 않을 수 있으므로, 제조공정성이 향상되는 동시에 전지팩 구성 시 경량화를 달성할 수 있다.In the present invention, since the mechanical rigidity is improved by the addition of the inorganic particles, a separate cell case may not be used to improve the safety of the secondary battery due to external forces such as needle penetration. Light weight can be achieved.
또한, 본 발명은 파우치형 이차전지의 일면 및 타면이 서로 다른 물성을 갖도록 코팅층을 형성시킴으로써 전지팩 구성 시 경량화를 도모하는 동시에 기계적 강성의 향상을 구현할 수 있다.In addition, the present invention can form a coating layer such that one surface and the other surface of the pouch-type secondary battery has different physical properties, thereby achieving a reduction in weight when constructing a battery pack and improving mechanical rigidity.
도 1은 종래의 파우치형 이차전지의 일반적인 구조에 대한 정면 투시도다;
도 2는 파우치형 이차전지의 일반적인 구조에 대한 분해 사시도이다;
도 3은 본 발명에 따른 이차전지의 제조방법에 대한 모식도이다;
도 4는 본 발명에 따른 이차전지를 딥-코팅법에 의해서 제조하는 과정에 대한 모식도이다. 1 is a front perspective view of a general structure of a conventional pouch type secondary battery;
2 is an exploded perspective view of a general structure of the pouch type secondary battery;
3 is a schematic view of a manufacturing method of a secondary battery according to the present invention;
4 is a schematic diagram of a process for manufacturing a secondary battery according to the present invention by a dip-coating method.
이하에서는, 본 발명의 실시예에 따른 도면을 참조하여 설명하지만, 이는 본 발명의 더욱 용이한 이해를 위한 것으로, 본 발명의 범주가 그것에 의해 한정되는 것은 아니다.Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.
도 2를 참조하면, 파우치형 이차전지(100)는, 전극조립체(30), 전극조립체(30)로부터 연장되어 있는 전극 탭들(40, 50), 전극 탭들(40, 50)에 용접되어 있는 전극리드(60, 70), 및 전극조립체(30)를 수용하는 전지케이스(20)를 포함하는 것으로 구성되어 있다.Referring to FIG. 2, the pouch type
전극조립체(30)는 분리막이 개재된 상태에서 양극과 음극이 순차적으로 적층되어 있는 발전소자로서, 스택형 또는 스택/폴딩형 구조로 이루어져 있다. 전극 탭들(40, 50)은 전극조립체(30)의 각 극판으로부터 연장되어 있고, 전극리드(60, 70)는 각 극판으로부터 연장된 복수 개의 전극 탭들(40, 50)과, 예를 들어, 용접에 의해 각각 전기적으로 연결되어 있으며, 전지케이스(20)의 외부로 일부가 노출되어 있다. 또한, 전극리드(60, 70)의 상하면 일부에는 전지케이스(20)와의 밀봉도를 높이고 동시에 전기적 절연상태를 확보하기 위하여 절연필름(80)이 부착되어 있다.The
전지케이스(10)는 알루미늄 라미네이트 시트로 이루어져 있고, 전극조립체(30)를 수용할 수 있는 공간을 제공하며, 전체적으로 파우치 형상을 가지고 있다.The
이차전지(100)는 전지케이스(20)의 수납부에 전극조립체(30)를 장착한 상태에서 전지케이스(20) 외주면의 접촉부위를 상호 열융착시켜 제조한다.The
이때, 최내층에 해당하는 내주 실란트층이 서로 대면하고 있는 상기 본체와 덮개의 실링부에 열을 가하는 경우, 내부 실란트층이 용융되면서 본체와 덮개가 융착에 의해 결합 및 밀봉된다. At this time, when the inner peripheral sealant layers corresponding to the innermost layer apply heat to the sealing portions of the main body and the cover, the main sealant and the cover are joined and sealed by fusion while the inner sealant layer is melted.
도 2와 같은 전극 조립체 수납 과정(S1), 전지 케이스 밀봉 과정(S2)을 거친 이차전지(100)은 도 3에 도시된 바와 같이 전압을 연결하고 충방전 사이클을 실시하여 활성화시키는 활성화 과정(S31), 활성화 과정 중에 발생된 가스를 외부로 배출하는 디개싱 과정(S32), 가스 배출을 위해 천공한 일측 단부를 재차 밀봉시키는 리실링 과정(S33) 및 절연성의 고분자 코팅물질 또는 무기물 입자가 함유된 절연성의 고분자 코팅물질로 이차전지(100)의 외주면 전부에 코팅층을 형성시키는 과정(S34)의 과정을 거친다. As shown in FIG. 3, the
도 4에는 딥-코팅법에 의해 본 발명에 따른 이차전지를 제조하는 과정이 모식적으로 도시되어 있다. 도 4를 참조하면, 코팅물질(210)이 담겨있는 코팅용기(200)에 이차전지(100)를 전극 탭의 길이 대비 30 내지 50%에 대응하는 길이까지 담갔다가 뺀 후 건조시키는 과정을 통해 이차전지(100)의 외주면에는 절연성의 고분자 코팅층(110)이 형성된다.
4 schematically shows a process of manufacturing a secondary battery according to the present invention by a dip-coating method. Referring to FIG. 4, the
이상 본 발명의 실시예에 따른 도면을 참조하여 설명하였지만, 본 발명이 속한 분야에서 통상의 지식을 가진 자라면 상기 내용을 바탕으로 본 발명의 범주 내에서 다양한 응용 및 변형을 행하는 것이 가능할 것이다.
Although described with reference to the drawings according to an embodiment of the present invention, those of ordinary skill in the art will be able to perform various applications and modifications within the scope of the present invention based on the above contents.
Claims (14)
내부 실란트층/금속 배리어 층/외부 수지층의 단면 구조로 이루어진 파우치형 전지케이스의 수납부에 양극/분리막/음극 구조의 전극조립체를 수납하는 과정;
전지케이스의 외주면 밀봉부를 고온의 실링 툴로 압착하여 융점이 낮은 내부 실란트층을 용융 및 상호 접착시켜 밀봉하는 과정;
상기 밀봉 이후에 파우치 형 이차전지 내의 가스를 외부로 배출시킨 후 전기 절연성을 갖는 코팅물질로 코팅하는 과정;
을 포함하는 것을 특징으로 하는 이차전지의 제조방법.As a method of manufacturing a secondary battery,
Storing an electrode assembly having a positive electrode / separation membrane / cathode structure in a pouch-type battery case accommodating a cross-sectional structure of an inner sealant layer / metal barrier layer / outer resin layer;
Pressing the outer circumferential surface sealing portion of the battery case with a high-temperature sealing tool to melt and mutually bond and seal the inner sealant layer having a low melting point;
Discharging the gas in the pouch-type secondary battery to the outside after the sealing, and then coating the coating material with electrical insulation;
Method for manufacturing a secondary battery comprising a.
The method of claim 12, wherein the coating is performed by a spray coating method.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014152171A1 (en) * | 2013-03-14 | 2014-09-25 | Solicore, Inc. | Batteries comprising a multilayer dielectric and sealing film and method of making the batteries |
| USD912614S1 (en) | 2019-01-04 | 2021-03-09 | Pure Watercraft, Inc. | Battery pack |
| US11183739B2 (en) | 2017-11-13 | 2021-11-23 | Pure Watercraft, Inc. | Batteries for electric marine propulsion systems, and associated systems and methods |
| US11688899B2 (en) | 2018-08-21 | 2023-06-27 | Pure Watercraft, Inc. | Batteries for electric marine propulsion systems, and associated systems and methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102069211B1 (en) * | 2016-03-30 | 2020-01-22 | 주식회사 엘지화학 | Lithium secondary battery and method for fabricating the same |
| KR102754813B1 (en) * | 2019-12-17 | 2025-01-13 | 주식회사 엘지에너지솔루션 | Pouch cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101108447B1 (en) * | 2006-08-28 | 2012-02-08 | 주식회사 엘지화학 | Manufacturing method of pouch type secondary battery excellent in sealing property |
| KR101150253B1 (en) * | 2007-09-21 | 2012-06-12 | 주식회사 엘지화학 | Secondary battery having improved prevention property against humidity permeability |
| KR101136799B1 (en) * | 2008-04-18 | 2012-04-19 | 주식회사 엘지화학 | Slim Type Battery Pack |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014152171A1 (en) * | 2013-03-14 | 2014-09-25 | Solicore, Inc. | Batteries comprising a multilayer dielectric and sealing film and method of making the batteries |
| US9876199B2 (en) | 2013-03-14 | 2018-01-23 | Brightvolt, Inc. | Batteries comprising a mulitlayer dielectric and sealing film and method of making the batteries |
| US10439173B2 (en) | 2013-03-14 | 2019-10-08 | Brightvolt, Inc. | Batteries comprising a mulitlayer dielectric and sealing film and method of making the batteries |
| US10991921B2 (en) | 2013-03-14 | 2021-04-27 | Brightvolt, Inc. | Batteries comprising a multilayer dielectric and sealing film and method of making the batteries |
| US11183739B2 (en) | 2017-11-13 | 2021-11-23 | Pure Watercraft, Inc. | Batteries for electric marine propulsion systems, and associated systems and methods |
| US11688899B2 (en) | 2018-08-21 | 2023-06-27 | Pure Watercraft, Inc. | Batteries for electric marine propulsion systems, and associated systems and methods |
| USD912614S1 (en) | 2019-01-04 | 2021-03-09 | Pure Watercraft, Inc. | Battery pack |
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