KR20150037392A - Secondary battery with improved safety - Google Patents
Secondary battery with improved safety Download PDFInfo
- Publication number
- KR20150037392A KR20150037392A KR20130116934A KR20130116934A KR20150037392A KR 20150037392 A KR20150037392 A KR 20150037392A KR 20130116934 A KR20130116934 A KR 20130116934A KR 20130116934 A KR20130116934 A KR 20130116934A KR 20150037392 A KR20150037392 A KR 20150037392A
- Authority
- KR
- South Korea
- Prior art keywords
- secondary battery
- pouch
- nonyltetracarboxylic
- acid
- thermosetting material
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/121—Organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/133—Thickness
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
본 발명은 안전성이 향상된 이차전지에 관한 것으로, 보다 구체적으로는 파우치용 이차전지의 전지케이스인 파우치에 연성(ductility)을 갖는 열경화성 물질을 포함시켜, 네일(nail)과 같은 날카로운 전도성 침상형 물체가 파우치를 손상시킬 때 연성을 갖는 열경화성 물질이 상기 침상형 물체를 둘러싸고 경화되도록 함으로써 추가적인 열 전도나 쇼트를 방지하는 이차전지에 관한 것이다.
[0001] The present invention relates to a secondary battery having improved safety, and more particularly, to a secondary battery having a pouch which is a battery case of a pouch secondary battery, which includes a ductile thermosetting material and a sharp conductive needle-shaped object such as a nail The present invention relates to a secondary battery which prevents additional heat conduction or short-circuiting by allowing a thermosetting substance having flexibility when the pouch is damaged to surround and cure the needle-shaped body.
최근 에너지 저장 기술에 대한 관심이 갈수록 높아지고 있다. 휴대폰, 캠코더 및 노트북 PC 등 적용분야가 확대되면서 전기 화학 소자의 연구와 개발에 대한 노력이 점점 구체화되고 있다. 전기 화학 소자는 이러한 측면에서 가장 주목받고 있는 분야이고, 그 중에서도 충·방전이 가능한 리튬 이차전지의 개발은 관심의 초점이 되고 있다.Recently, interest in energy storage technology is increasing. With the expansion of applications such as mobile phones, camcorders and notebook PCs, efforts for research and development of electrochemical devices are becoming more and more specified. Electrochemical devices have attracted the greatest attention in this respect, and among them, the development of lithium secondary batteries capable of being charged and discharged has become the focus of attention.
특히, 리튬 이차전지는 화석 연료를 사용하는 기존의 가솔린 차량, 디젤 차량 등의 대기오염 등을 해결하기 위한 방안으로 제시되고 있는 전기자동차(EV), 하이브리드 전기자동차(HEV) 등의 동력원으로서도 주목받고 있다.In particular, lithium secondary batteries are attracting attention as power sources for electric vehicles (EVs) and hybrid electric vehicles (HEVs), which are proposed as solutions for air pollution of existing gasoline vehicles and diesel vehicles using fossil fuels have.
소형 모바일 기기들에는 디바이스 1 대당 하나 또는 두서너 개의 전지셀들이 사용됨에 반하여, 보조 전력장치 또는 자동차 등과 같은 중대형 디바이스에는 고출력 대용량의 필요성으로 인해, 다수의 전지셀을 전기적으로 연결한 전지모듈이 사용된다.In small mobile devices, one or two or fewer battery cells are used per device, whereas a middle or large type device such as an auxiliary power device or an automobile is used with a battery module in which a plurality of battery cells are electrically connected due to the necessity of a high output large capacity .
전지모듈은 가능하면 작은 크기와 중량으로 제조되는 것이 바람직하므로, 높은 집적도로 충적될 수 있고 용량 대비 중량이 작은 각형 전지, 파우치형 전지 등이 중대형 전지모듈의 전지셀(단위전지)로서 주로 사용되고 있다. Since the battery module is preferably made as small in size and weight as possible, a prismatic battery, a pouch-shaped battery, or the like, which can be filled with a high degree of integration and has a small weight to capacity, is mainly used as a battery cell (unit cell) of a middle- or large- .
파우치형 이차전지는 이차전지의 포장재로서 파우치를 사용한 이차전지를 지칭하는 것으로, 전지의 전기 화학적 성질에 대한 보완 및 방열성 등을 제고하기 위하여 가스 배리어(gas barrier) 층이 개재된 형태로 구성된다. 이러한 이차전지용 파우치의 일 양태는 도 1에 도시된 것과 같은 단면을 가질 수 있다. 도 1을 참조하면, 파우치용 필름은 내층(11), 가스 배리어 층(13) 및 외층(15, 17)을 포함한다. 이 때, 내층(11)은 전지가 내장된 후에 전지에 접착되는 층으로, 폴리프로필렌 등으로 형성될 수 있다. 가스 배리어 층(13)은 외부의 수분, 가스 등이 전지 어셈블리 측으로 침투하는 것을 방지하며, 파우치의 기계적 강도 향상과 함께 파우치에 주입된 화학 물질이 외부로 유출되는 것을 방지하기 위한 것으로, 주로 알루미늄 박막(Al foil)이 사용되어 왔다. 또한, 외층(15, 17)은 이차전지를 외부의 충격으로부터 보호하는 역할을 하며, 각각 나일론 수지 층과 폴리에틸렌 테레프탈레이트(poly ethylene terephthalate, PET) 수지 층일 수 있다. 도 1에 개재된 파우치에서는 내층이 가장 두껍고 외층이 가장 얇은 구조를 갖는데, 일례로 이차전지용 파우치로 사용하기 위해 내층 70㎛, 알루미늄 호일 층 40㎛, 나일론 층 15㎛, PET 층 9㎛의 치수를 갖는 파우치 필름을 제조할 수 있다. 또한, 층간 부착을 위해 상기 층 각각의 사이에는 접착층(12, 14, 16)이 존재할 수 있다.A pouch-type secondary battery refers to a secondary battery using a pouch as a packaging material for a secondary battery, and has a gas barrier layer interposed therebetween in order to complement the electrochemical properties of the battery and to improve heat dissipation. One aspect of such a pouch for a secondary battery may have a cross section as shown in Fig. Referring to Figure 1, the pouch film comprises an
이와 같은 구조를 갖는 파우치를 외장케이스로 하는 파우치형 이차전지는 중량이 작고 형태 변형이 용이하다는 장점이 있지만, 이러한 장점으로 인하여 기계적 물성이 우수하지 못하다는 문제점도 가지고 있다. 예를 들어, 도 2를 참조하여 설명하면, 전도성 침상형 물체(21)가 파우치형 이차전지(22)의 파우치 필름(24)을 지나 전극조립체(23)에 침투하거나 관통하는 경우, 과도한 전류 흐름으로 인해 국부적 에너지 집중이 발생하여 전지 온도가 비정상적으로 상승하고 이로 인해 전지가 발화 또는 폭발하는 위험이 있다.
The pouch-type secondary battery using the pouch having the above-described structure as an external case is advantageous in that it is small in weight and easily deformed in shape. However, the pouch type secondary battery has a problem that mechanical properties are not excellent due to such advantages. 2, when the conductive needle-
본 발명에서는 전도성 침상형 물체가 파우치 이차전지에 침투하거나 관통하는 경우, 전도성 침상형 물체와 전극조립체간의 접촉 또한 전도성 침상형 물체와 전해액간의 접촉을 차단함으로써 과도한 전류의 흐름을 저지하여 국부적인 에너지 집중에 따른 온도의 상승 및 이로 인한 발화 또는 폭발의 위험을 낮추고자 한다.
In the present invention, when the conductive needle-shaped body penetrates or penetrates the pouch secondary battery, the contact between the conductive needle-shaped body and the electrode assembly and the contact between the conductive needle-shaped body and the electrolyte are blocked to prevent excessive current flow, To reduce the risk of ignition or explosion.
본 발명은 전술한 기술적 과제를 해결하기 위한 것으로, 본 발명의 일 양태에서는 100 내지 120℃에서 열경화하고 연성(ductility)을 갖는 열경화성 물질을 포함하는 파우치를 구비한 이차전지가 제공된다.SUMMARY OF THE INVENTION The present invention provides a secondary battery having a pouch including a thermosetting material having a thermosetting and ductility at 100 to 120 ° C in an embodiment of the present invention.
상기 연성을 갖는 열경화성 물질은 필름 형태로 포함될 수 있다.The soft thermosetting material may be included in the form of a film.
상기 파우치는 내층, 배리어층 및 외층으로 구성되고, 상기 연성을 갖는 열경화성 물질이 배리어층과 외층 사이에 또는 외층 상에 적층되어 필름 형태로 포함될 수 있다.The pouch may be comprised of an inner layer, a barrier layer and an outer layer, and the soft thermosetting material may be laminated between the barrier layer and the outer layer or on the outer layer to be included in the form of a film.
상기 연성을 갖는 열경화성 물질은 1 내지 100㎛ 두께의 필름 형태로 포함될 수 있다.The flexible thermosetting material may be included in the form of a film having a thickness of 1 to 100 mu m.
상기 연성을 갖는 열경화성 물질은 스티렌-부타디엔 고무, 폴리비닐리덴 풀루오라이드-헥사플루오로프로필렌, 폴리비닐리덴 풀루오라이드-트리클로로에틸렌, 폴리메틸메타크릴레이트, 폴리아크릴로니트릴, 폴리비닐피롤리돈, 폴리비닐아세테이트, 폴리에틸렌-비닐 아세테이트 공중합체, 폴리에틸렌옥사이드, 셀룰로오스 아세테이트, 셀룰로오스 아세테이트 부틸레이트, 셀룰로오스 아세테이트 프로피오네이트, 시아노에틸풀루란, 시아노에틸폴리비닐알콜, 시아노에틸셀룰로오스, 시아노에틸수크로오스, 풀루란, 카르복실 메틸 셀룰로오스, 폴리이미드 및 이들의 혼합물로 이루어진 군에서 선택된 1종 이상일 수 있다.The flexible thermosetting material may be selected from the group consisting of styrene-butadiene rubber, polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-trichlorethylene, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrole Polyvinyl acetate, polyethylene-vinyl acetate copolymer, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethylpolyvinyl alcohol, cyanoethylcellulose, cyano Ethyl cellulose, sucrose, ethyl sucrose, pullulan, carboxymethylcellulose, polyimide, and mixtures thereof.
상기 이차전지는 리튬 이차전지일 수 있다.The secondary battery may be a lithium secondary battery.
본 발명의 다른 양태에 따르면, 전술한 이차전지를 단위전지로 포함하는 것을 특징으로 하는 디바이스가 제공된다.According to another aspect of the present invention, there is provided a device comprising the above-described secondary battery as a unit cell.
상기 디바이스는 전기자동차, 하이브리드 전기자동차, 플러그-인 하이브리드 전기자동차, 또는 전력저장장치일 수 있다.
The device may be an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.
본 발명에서는 파우치에 연성을 갖는 열경화성 물질이 포함되어 있어, 전도성 침상형 물체가 이차전지에 침투되거나 관통되는 경우, 상기 열경화성 물질이 전도성 침상형 물체를 둘러싸서 경화되므로 전도성 침상형 물체가 전해액이나 전극조립체와 직접 접촉하지 않게 된다. In the present invention, a thermosetting material having ductility is contained in the pouch, so that when the conductive needle-like object penetrates or penetrates into the secondary battery, the thermosetting material is cured by surrounding the conductive needle-shaped object, so that the conductive needle- So that it is not in direct contact with the assembly.
또한, 전도성 침상형 물체가 침투된 후에 발생한 열에 의해 상기 열경화성 물질이 경화되므로, 전도성 침상형 물체에 의한 추가적인 열전도나 쇼트가 방지될 수 있다. Further, since the thermosetting material is cured by the heat generated after the conductive needle-shaped object is infiltrated, additional heat conduction or shot by the conductive needle-like object can be prevented.
그 결과, 상기 파우치를 구비한 이차전지는 보다 향상된 안전성을 갖게 된다.
As a result, the secondary battery having the pouch has improved safety.
도 1은 종래 파우치의 일 양태의 단면을 개략적으로 나타낸 것이다.
도 2는 종래 이차전지에 전도성 침상형 물체가 관통하는 경우를 개략적으로 나타낸 도면이다.
도 3은 본 발명의 일 양태에 따른 이차전지에 전도성 침상형 물체가 관통하는 경우를 개략적으로 나타낸 도면이다.BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 schematically illustrates a cross section of one embodiment of a conventional pouch.
FIG. 2 is a view schematically showing a case where a conductive needle-shaped object passes through a conventional secondary battery.
3 is a schematic view illustrating a case where a conductive needle-shaped object passes through a secondary battery according to an embodiment of the present invention.
이하, 본 발명을 상세히 설명하기로 한다. 본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니 되며, 발명자는 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.Hereinafter, the present invention will be described in detail. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.
본 발명에 따른 이차전지는 전극조립체가 파우치형 전지케이스에 수납되어 있는 이차전지로서, 상기 파우치는 연성을 갖는 열경화성 물질을 포함한다.The secondary battery according to the present invention is a secondary battery in which an electrode assembly is housed in a pouch-shaped battery case, and the pouch includes a soft thermosetting material.
본원 명세서에서 '연성'이라 함은 연성을 갖는 열경화성 물질에 네일과 같은 침상형 물질이 가해질 때 상기 열경화성 물질이 침상형 물질을 둘러싸도록 늘어날 수 있는 물성을 의미하는 것으로 이해한다.In the present specification, 'soft' is understood as meaning that the thermosetting material can be stretched so as to surround the needle-shaped material when the needle-like material such as nail is applied to the thermosetting material having ductility.
또한, 본원 명세서에서 '열경화성'이라 함은 전지에서 고온의 열이 발생할 때 경화될 수 있는 물성을 의미하는 것으로 이해한다. The term 'thermosetting' in the present specification is understood to mean a physical property that can be cured when high-temperature heat is generated in a battery.
연성을 갖는 열경화성 물질은 필름 형태로 파우치에 포함될 수 있다. 연성을 갖는 열경화성 물질의 파우치내 위치는 특별히 제한되지는 않는다. 본 발명의 예시적인 일 양태에서, 연성을 갖는 열경화성 물질은 배리어층(알루미늄층)과 외층 사이에 또는 최외층으로 배치될 수 있으며, 이러한 양태에서는 전지 충, 방전시에 발생하는 열의 열전도 저하에 의한 열폭발이 방지되는 한편, 열경화성 물질이 조기에, 예컨대, 침상형 물질에 의한 손상이 일어나기 전에 경화되는 것이 방지된다.Flexible thermosetting materials may be included in the pouch in film form. The position of the thermosetting substance having ductility in the pouch is not particularly limited. In an exemplary embodiment of the present invention, the soft thermosetting material may be disposed between the barrier layer (the aluminum layer) and the outer layer or as the outermost layer, and in such an embodiment, the thermal conductivity of the battery, While thermal explosion is prevented, the thermosetting material is prevented from curing early, for example, before damage by the acicular material occurs.
연성을 갖는 열경화성 물질이 필름 형태의 파우치에 포함될 때, 상기 필름은 1 내지 100㎛ 두께를 가질 수 있다. 상기 필름이 하한치보다 얇을 경우에는 침상형 물질에 의해 필름이 용이하게 관통될 수 있고, 상기 필름이 상한치보다 두꺼울 경우에는 전지의 전체 부피가 불필요하게 증가할 수 있다. When a flexible thermoset material is included in a film-form pouch, the film may have a thickness of 1 to 100 mu m. If the film is thinner than the lower limit, the film can easily penetrate by the needle-shaped material. If the film is thicker than the upper limit value, the total volume of the battery may unnecessarily increase.
연성을 갖는 열경화성 물질은 연성을 갖고 100 내지 120℃에서 열경화하는 특성을 갖는 것이 바람직하다. 이는 일반적으로 150℃ 이상에서 전지 또는 셀의 발화가 발생할 수 있기 때문이다. 연성을 갖는 열경화성 물질의 비제한적인 예로는 스티렌-부타디엔 고무, 폴리비닐리덴 풀루오라이드-헥사풀루오로프로필렌, 폴리비닐리덴 풀루오라이드-트리클로로에틸렌, 폴리메틸메타크릴레이트, 폴리아크릴로니트릴, 폴리비닐피롤리돈, 폴리비닐아세테이트, 폴리에틸렌-비닐 아세테이트 공중합체, 폴리에틸렌옥사이드, 셀룰로오스 아세테이트, 셀룰로오스 아세테이트 부틸레이트, 셀룰로오스 아세테이트 프로피오네이트, 시아노에틸풀루란, 시아노에틸폴리비닐알콜, 시아노에틸셀룰로오스, 시아노에틸수크로오스, 풀루란, 카르복실 메틸 셀룰로오스, 폴리이미드 및 이들의 혼합물로 이루어진 군에서 선택된 1종 이상을 들 수 있으나, 이에 제한되는 것은 아니다.It is preferable that the thermosetting substance having ductility has a ductility and a property of thermosetting at 100 to 120 캜. This is because the ignition of a cell or a cell may occur at a temperature of 150 ° C or higher. Non-limiting examples of flexible thermosetting materials include styrene-butadiene rubber, polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-trichlorethylene, polymethyl methacrylate, polyacrylonitrile , Polyvinyl pyrrolidone, polyvinyl acetate, polyethylene-vinyl acetate copolymer, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethylpolyvinyl alcohol, cyano But is not limited to, at least one selected from the group consisting of ethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, polyimide, and mixtures thereof.
본 발명에 따라 전술한 구조를 갖는 파우치에 이차전지용 전극조립체가 수납되는 양태를 도 3을 참조하여 설명할 때, 전도성 침상형 물체(31)가 파우치형 이차전지(32) 내부를 관통하는 경우, 전극조립체(33)에 침투하는 침상형 물체(31)를 열경화성 필름(35)이 감싸면서 열경화성 필름(35)이 침상형 물체(31)를 둘러싸며 경화되어 추가적인 열 전도나 쇼트를 방지하므로 이차전지의 안전성이 향상되는 결과를 갖게 된다.3, when the conductive needle-
본 발명에서 사용되는 이차전지는 리튬 이차전지일 수 있다. The secondary battery used in the present invention may be a lithium secondary battery.
리튬 이차전지는 양극, 음극, 분리막 및 리튬함유 비수계 전해액으로 구성되어 있다. The lithium secondary battery comprises a positive electrode, a negative electrode, a separator, and a lithium-containing non-aqueous electrolyte.
상기 양극은 예를 들어, 양극 합제를 NMP 등의 용매에 혼합하여 만들어진 슬러리를 음극 집전체 상에 도포한 후 건조 및 압연하여 제조될 수 있다. 양극 합제는 양극 활물질 이외에 선택적으로 도전재, 바인더, 충진제 등이 포함될 수 있다. The anode may be prepared, for example, by applying a slurry prepared by mixing a cathode mixture to a solvent such as NMP, and then drying and rolling the cathode slurry. In addition to the positive electrode active material, the positive electrode mixture may optionally contain a conductive material, a binder, a filler, and the like.
상기 양극 활물질은 전기화학적 반응을 일으킬 수 있는 물질로서, 리튬 전이금속 산화물로서, 2 이상의 전이금속을 포함하고, 예를 들어, 1 또는 그 이상의 전이금속으로 치환된 리튬 코발트 산화물(LiCoO2), 리튬 니켈 산화물(LiNiO2) 등의 층상 화합물; 1 또는 그 이상의 전이금속으로 치환된 리튬 망간 산화물; 화학식 LiNi1-yMyO2(여기서, M = Co, Mn, Al, Cu, Fe, Mg, B, Cr, Zn 또는 Ga 이고 상기 원소 중 하나 이상의 원소를 포함, 0.01≤y≤0.7 임)으로 표현되는 리튬 니켈계 산화물; Li1 + zNi1 /3Co1 /3Mn1 /3O2, Li1 + zNi0 .4Mn0 .4Co0 .2O2 등과 같이 Li1 + zNibMncCo1 -(b+c+d)MdO(2-e)Ae (여기서, -0.5≤z≤0.5, 0.1≤b≤0.8, 0.1≤c≤0.8, 0≤d≤0.2, 0≤e≤0.2, b+c+d<1 임, M = Al, Mg, Cr, Ti, Si 또는 Y 이고, A = F, P 또는 Cl 임)으로 표현되는 리튬 니켈 코발트 망간복합산화물; 화학식 Li1 + xM1 - yM'yPO4 -zXz(여기서, M = 전이금속, 바람직하게는 Fe, Mn, Co 또는 Ni 이고, M' = Al, Mg 또는 Ti 이고, X = F, S 또는 N 이며, -0.5≤x≤+0.5, 0≤y≤0.5, 0≤z≤0.1 임)로 표현되는 올리빈계 리튬금속 포스페이트 등을 들 수 있지만, 이들만으로 한정되는 것은 아니다.The cathode active material is a material capable of causing an electrochemical reaction. Examples of the lithium transition metal oxide include lithium cobalt oxide (LiCoO 2 ) containing two or more transition metals and substituted with one or more transition metals, lithium Layered compounds such as nickel oxide (LiNiO 2 ); Lithium manganese oxide substituted with one or more transition metals; Formula LiNi 1-y M y O 2 ( where, M = Co, Mn, Al , Cu, Fe, Mg, B, Cr, Zn or Ga and Lim, 0.01≤y≤0.7 include one or more elements of the element) A lithium nickel-based oxide represented by the following formula: Li 1 + z Ni 1/3 Co 1/3 Mn 1/3 O 2, Li 1 + z Ni 0 .4 Mn 0 .4 Co 0 .2 O 2 Li , such as 1 + z Ni b Mn c Co 1 - (b + c + d) M d O (2-e) A e where -0.5? z? 0.5, 0.1? b? 0.8, 0.1? c? 0.8, 0? d? 0.2, , b + c + d < 1, M = Al, Mg, Cr, Ti, Si or Y, and A = F, P or Cl; Formula Li 1 + x M 1 - and y M 'y PO 4 -z X z ( wherein, M = a transition metal, preferably Fe, Mn, Co or Ni, M' = Al, Mg or Ti, X = F, S or N, and -0.5? X? +0.5, 0? Y? 0.5, and 0? Z? 0.1), but the present invention is not limited thereto.
상기 도전재는 통상적으로 양극 활물질을 포함한 혼합물 전체 중량을 기준으로 1 내지 30 중량%로 첨가된다.The conductive material is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture including the cathode active material.
이러한 도전재는 당해 전지에 화학적 변화를 유발하지 않으면서 도전성을 가진 것이라면 특별히 제한되는 것은 아니며, 예를 들어, 천연 흑연이나 인조 흑연 등의 흑연; 카본블랙, 아세틸렌 블랙, 케첸 블랙, 채널 블랙, 퍼네이스 블랙, 램프 블랙, 서머 블랙 등의 카본블랙; 탄소 섬유나 금속 섬유 등의 도전성 섬유; 불화 카본, 알루미늄, 니켈 분말 등의 금속 분말; 산화아연, 티탄산 칼륨 등의 도전성 위스키; 산화 티탄 등의 도전성 금속 산화물; 폴리페닐렌 유도체 등의 도전성 소재 등이 사용될 수 있다. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.
상기 바인더는 활물질과 도전재 등의 결합과 집전체에 대한 결합에 조력하는 성분으로서, 통상적으로 양극 활물질을 포함하는 혼합물 전체 중량을 기준으로 1 내지 30 중량%로 첨가된다. 이러한 바인더의 예로는, 폴리불화비닐리덴, 폴리비닐알코올, 카르복시메틸셀룰로우즈(CMC), 전분, 히드록시프로필셀룰로우즈, 재생 셀룰로우즈, 폴리비닐피롤리돈, 테트라플루오로에틸렌, 폴리에틸렌, 폴리프로필렌, 에틸렌-프로필렌-디엔 테르 폴리머(EPDM), 술폰화 EPDM, 스티렌 브티렌 고무, 불소 고무, 다양한 공중합제 등을 들 수 있다. The binder is a component which assists in bonding of the active material and the conductive material and bonding to the current collector, and is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture containing the cathode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, and various copolymers.
상기 충진제는 전극의 팽창을 억제하는 성분으로서 선택적으로 사용되며, 당해 전지에 화학적 변화를 유발하지 않으면서 섬유상 재료라면 특별히 제한되는 것은 아니며, 예를 들어, 폴리에틸렌, 폴리프로필렌 등의 올리핀계 중합제; 유리섬유, 탄소섬유 등의 섬유상 물질이 사용된다.The filler is optionally used as a component for suppressing the expansion of the electrode, and is not particularly limited as long as it is a fibrous material without causing any chemical change in the battery. Examples of the filler include olefin-based polymerizers such as polyethylene and polypropylene; Fibrous materials such as glass fibers and carbon fibers are used.
상기 양극 집전체는 일반적으로 3 내지 500 ㎛의 두께로 만들어진다. 이러한 양극 집전체는, 당해 전지에 화학적 변화를 유발하지 않으면서 도전성을 가진 것이라면 특별히 제한되는 것은 아니며, 예를 들어, 스테인리스 스틸, 알루미늄, 니켈, 티탄, 소성 탄소, 또는 알루미늄이나 스테인리스 스틸의 표면에 카본, 니켈, 티탄, 은 등으로 표면처리한 것 등이 사용될 수 있다. 집전체는 그것의 표면에 미세한 요철을 형성하여 양극 활물질의 접착력을 높일 수도 있으며, 필름, 시트, 호일, 네트, 다공질체, 발포체, 부직포체 등 다양한 형태가 가능하다.The cathode current collector is generally made to have a thickness of 3 to 500 mu m. Such a positive electrode collector is not particularly limited as long as it has conductivity without causing chemical change to the battery, and may be formed on the surface of stainless steel, aluminum, nickel, titanium, sintered carbon or aluminum or stainless steel Carbon, nickel, titanium, silver, or the like may be used. The current collector may have fine irregularities on the surface thereof to increase the adhesive force of the cathode active material, and various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric are possible.
상기 음극은, 예를 들어, 음극 집전체 상에 음극 활물질을 포함하고 있는 음극 합제를 도포한 후 건조하여 제조되며, 상기 음극 합제에는, 필요에 따라, 앞서 설명한 바와 같은 도전재, 바인더, 충진제 등의 성분들이 포함될 수 있다. The negative electrode is prepared, for example, by applying a negative electrode mixture containing a negative electrode active material on a negative electrode collector and then drying the same. The negative electrode mixture may contain a conductive material, a binder, a filler, May be included.
상기 음극 활물질로는, 예를 들어, 천연 흑연, 인조 흑연, 팽창 흑연, 탄소섬유, 난흑연화성 탄소, 카본블랙, 카본나노튜브, 플러렌, 활성탄 등의 탄소 및 흑연재료; 리튬과 합금이 가능한 Al, Si, Sn, Ag, Bi, Mg, Zn, In, Ge, Pb, Pd, Pt, Ti 등의 금속 및 이러한 원소를 포함하는 화합물; 금속 및 그 화합물과 탄소 및 흑연재료의 복합물; 리튬 함유 질화물 등을 들 수 있다. 그 중에서도 탄소계 활물질, 규소계 활물질, 주석계 활물질, 또는 규소-탄소계 활물질이 더욱 바람직하며, 이들은 단독으로 또는 둘 이상의 조합으로 사용될 수도 있다.Examples of the negative electrode active material include carbon and graphite materials such as natural graphite, artificial graphite, expanded graphite, carbon fiber, non-graphitizable carbon, carbon black, carbon nanotube, fullerene and activated carbon; Metals such as Al, Si, Sn, Ag, Bi, Mg, Zn, In, Ge, Pb, Pd, Pt and Ti which can be alloyed with lithium and compounds containing these elements; Complexes of metals and their compounds and carbon and graphite materials; Lithium-containing nitrides, and the like. Among them, a carbon-based active material, a silicon-based active material, a tin-based active material, or a silicon-carbon based active material is more preferable, and these may be used singly or in combination of two or more.
상기 음극 집전체는 일반적으로 3 내지 500 ㎛의 두께로 만든다. 이러한 음극 집전체는, 당해 전지에 화학적 변화를 유발하지 않으면서 높은 도전성을 가지는 것이라면 특별히 제한되는 것은 아니며, 예를 들어, 구리, 스테인리스 스틸, 알루미늄, 니켈, 티탄, 소성 탄소, 구리나 스테인리스 스틸의 표면에 카본, 니켈, 티탄, 은 등으로 표면처리한 것, 알루미늄-카드뮴 합금 등이 사용될 수 있다. 또한, 양극 집전체와 마찬가지로, 표면에 미세한 요철을 형성하여 음극 활물질의 결합력을 강화시킬 수도 있으며, 필름, 시트, 호일, 네트, 다공질체, 발포체, 부직포체 등 다양한 형태로 사용될 수 있다. The negative electrode collector is generally made to have a thickness of 3 to 500 mu m. The negative electrode current collector is not particularly limited as long as it has high conductivity without causing chemical change in the battery. Examples of the negative electrode current collector include copper, stainless steel, aluminum, nickel, titanium, sintered carbon, copper or stainless steel Surface-treated with carbon, nickel, titanium, silver or the like, aluminum-cadmium alloy, or the like can be used. In addition, like the positive electrode collector, fine unevenness can be formed on the surface to enhance the bonding force of the negative electrode active material, and it can be used in various forms such as films, sheets, foils, nets, porous bodies, foams and nonwoven fabrics.
상기 분리막은 양극과 음극 사이에 개재되며, 높은 이온 투과도와 기계적 강도를 가지는 절연성의 얇은 박막이 사용된다. 분리막의 기공 직경은 일반적으로 0.01 ~ 10 ㎛이고, 두께는 일반적으로 5 ~ 300 ㎛이다. 이러한 분리막으로는, 예를 들어, 내화학성 및 소수성의 폴리프로필렌 등의 올레핀계 폴리머; 유리섬유 또는 폴리에틸렌 등으로 만들어진 시트나 부직포 등이 사용된다. 전해질로서 폴리머 등의 고체 전해질이 사용되는 경우에는 고체 전해질이 분리막을 겸할 수도 있다. The separation membrane is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 mu m and the thickness is generally 5 to 300 mu m. Such separation membranes include, for example, olefinic polymers such as polypropylene, which are chemically resistant and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like is used. When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane.
상기 리튬염 함유 비수계 전해액은 전해액과 리튬염으로 이루어져 있으며, 상기 전해액으로는 비수계 유기용매, 유기 고체 전해질, 무기 고체 전해질 등이 사용된다.The lithium salt-containing nonaqueous electrolyte solution is composed of an electrolyte solution and a lithium salt. As the electrolyte solution, a nonaqueous organic solvent, an organic solid electrolyte, and an inorganic solid electrolyte may be used.
상기 비수계 유기용매로는, 예를 들어, N-메틸-2-피롤리디논, 프로필렌 카르보네이트, 에틸렌 카르보네이트, 부틸렌 카르보네이트, 디메틸 카르보네이트, 디에틸 카르보네이트, 감마-부틸로 락톤, 1,2-디메톡시 에탄, 테트라히드록시 프랑(franc), 2-메틸 테트라하이드로푸란, 디메틸술폭시드, 1,3-디옥소런, 포름아미드, 디메틸포름아미드, 디옥소런, 아세토니트릴, 니트로메탄, 포름산 메틸, 초산메틸, 인산 트리에스테르, 트리메톡시 메탄, 디옥소런 유도체, 설포란, 메틸 설포란, 1,3-디메틸-2-이미다졸리디논, 프로필렌 카르보네이트 유도체, 테트라하이드로푸란 유도체, 에테르, 피로피온산 메틸, 프로피온산 에틸 등의 비양자성 유기용매가 사용될 수 있다. Examples of the non-aqueous organic solvent include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma -Butyrolactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane , Acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate Nonionic organic solvents such as tetrahydrofuran derivatives, ethers, methyl pyrophosphate, ethyl propionate and the like can be used.
상기 유기 고체 전해질로는, 예를 들어, 폴리에틸렌 유도체, 폴리에틸렌 옥사이드 유도체, 폴리프로필렌 옥사이드 유도체, 인산 에스테르 폴리머, 폴리 에지테이션 리신(agitation lysine), 폴리에스테르 술파이드, 폴리비닐알코올, 폴리 불화 비닐리덴, 이온성 해리기를 포함하는 중합제 등이 사용될 수 있다. Examples of the organic solid electrolyte include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, A polymer containing an ionic dissociation group and the like may be used.
상기 무기 고체 전해질로는, 예를 들어, Li3N, LiI, Li5NI2, Li3N-LiI-LiOH, LiSiO4, LiSiO4-LiI-LiOH, Li2SiS3, Li4SiO4, Li4SiO4-LiI-LiOH, Li3PO4-Li2S-SiS2 등의 Li의 질화물, 할로겐화물, 황산염 등이 사용될 수 있다. Examples of the inorganic solid electrolyte include Li 3 N, LiI, Li 5 NI 2 , Li 3 N-LiI-LiOH, LiSiO 4 , LiSiO 4 -LiI-LiOH, Li 2 SiS 3 , Li 4 SiO 4 , Nitrides, halides and sulfates of Li such as Li 4 SiO 4 -LiI-LiOH and Li 3 PO 4 -Li 2 S-SiS 2 can be used.
상기 리튬염은 상기 비수계 전해질에 용해되기 좋은 물질로서, 예를 들어, LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2) 2NLi, 클로로 보란 리튬, 저급 지방족 카르본산 리튬, 4 페닐 붕산 리튬, 이미드 등이 사용될 수 있다.The lithium salt is a material that is readily soluble in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4, LiBF 4, LiB 10 Cl 10, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF 6, LiSbF 6, LiAlCl 4, CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.
또한, 전해액에는 충방전 특성, 난연성 등의 개선을 목적으로, 예를 들어, 피리딘, 트리에틸포스파이트, 트리에탄올아민, 환상 에테르, 에틸렌 디아민, n-글라임(glyme), 헥사 인산 트리 아미드, 니트로벤젠 유도체, 유황, 퀴논 이민 염료, N-치환 옥사졸리디논, N,N-치환 이미다졸리딘, 에틸렌 글리콜 디알킬 에테르, 암모늄염, 피롤, 2-메톡시 에탄올, 삼염화 알루미늄 등이 첨가될 수도 있다. 경우에 따라서는, 불연성을 부여하기 위하여, 사염화탄소, 삼불화에틸렌 등의 할로겐 함유 용매를 더 포함시킬 수도 있고, 고온 보존 특성을 향상시키기 위하여 이산화탄산 가스를 더 포함시킬 수도 있다. For the purpose of improving the charge / discharge characteristics and the flame retardancy, the electrolytic solution is preferably mixed with an organic solvent such as pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, glyme, Benzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrrole, 2-methoxyethanol, . In some cases, a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further added to impart nonflammability, or a carbon dioxide gas may be further added to improve high-temperature storage characteristics.
상기와 같은 이차전지는 소형 디바이스의 전원으로 사용되는 전지셀에 사용될 수 있을 뿐만 아니라, 고온 안정성 및 긴 사이클 특성과 높은 레이트 특성 등이 요구되는 중대형 디바이스의 전원으로 사용되는 다수의 전지셀들을 포함하는 중대형 전지모듈에 단위전지로도 바람직하게 사용될 수 있다.Such a secondary battery includes a plurality of battery cells used as a power source for a middle- or large-sized device requiring high temperature stability, long cycle characteristics, and high rate characteristics, And may be suitably used as a unit cell in a middle- or large-sized battery module.
상기 중대형 디바이스의 바람직한 예로는 전지적 모터에 의해 동력을 받아 움직이는 파워 툴(power tool); 전기자동차(Electric Vehicle, EV), 하이브리드 전기자동차(Hybrid Electric Vehicle, HEV), 플러그-인 하이브리드 전기자동차(Plug-in Hybrid Electric Vehicle, PHEV) 등을 포함하는 전기차; 전기 자전거(E-bike), 전기 스쿠터(E-scooter)를 포함하는 전기 이륜차; 전기 골프 카트(electric golf cart) 등을 들 수 있으나, 이에 한정되는 것은 아니다.
Preferred examples of the above medium to large devices include a power tool that is powered by an electric motor and moves; An electric vehicle including an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and the like; An electric motorcycle including an electric bike (E-bike) and an electric scooter (E-scooter); An electric golf cart, and the like, but the present invention is not limited thereto.
23: 전극조립체
24, 34: 파우치23: electrode assembly
24, 34: Pouch
Claims (8)
A secondary battery comprising a pouch comprising a thermosetting material thermally cured at 100-120 < 0 > C and having ductility.
상기 연성을 갖는 열경화성 물질이 필름 형태로 포함되어 있는 것을 특징으로 하는 이차전지.
The method according to claim 1,
Wherein the flexible thermosetting material is contained in a film form.
상기 파우치가 내층, 배리어층 및 외층으로 구성되고,
상기 연성을 갖는 열경화성 물질이 배리어층과 외층 사이에 또는 외층 상에 적층되어 필름 형태로 포함되어 있는 것을 특징으로 하는 이차전지.
The method according to claim 1,
Wherein the pouch comprises an inner layer, a barrier layer and an outer layer,
Wherein the flexible thermosetting material is laminated between the barrier layer and the outer layer or on the outer layer and is contained in the form of a film.
상기 연성을 갖는 열경화성 물질이 1 내지 100㎛ 두께의 필름 형태로 포함되어 있는 것을 특징으로 하는 이차전지.
The method of claim 1,
Wherein the flexible thermosetting material is contained in the form of a film having a thickness of 1 to 100 mu m.
상기 연성을 갖는 열경화성 물질이 스티렌-부타디엔 고무, 폴리비닐리덴 풀루오라이드-헥사풀루오로프로필렌, 폴리비닐리덴 풀루오라이드-트리클로로에틸렌, 폴리메틸메타크릴레이트, 폴리아크릴로니트릴, 폴리비닐피롤리돈, 폴리비닐아세테이트, 폴리에틸렌-비닐 아세테이트 공중합체, 폴리에틸렌옥사이드, 셀룰로오스 아세테이트, 셀룰로오스 아세테이트 부틸레이트, 셀룰로오스 아세테이트 프로피오네이트, 시아노에틸풀루란, 시아노에틸폴리비닐알콜, 시아노에틸셀룰로오스, 시아노에틸수크로오스, 풀루란, 카르복실 메틸 셀룰로오스, 폴리이미드 및 이들의 혼합물로 이루어진 군에서 선택된 1종 이상인 것을 특징으로 하는 이차전지.
The method according to claim 1,
Wherein the flexible thermoset material is selected from the group consisting of styrene-butadiene rubber, polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-trichlorethylene, polymethyl methacrylate, polyacrylonitrile, Polyvinyl acetate, polyethylene-vinyl acetate copolymer, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethylpolyvinyl alcohol, cyanoethylcellulose, Wherein the secondary battery is at least one selected from the group consisting of novolac, sucrose, nonyltetracarboxylic acid, nonyltetracarboxylic acid, nonyltetracarboxylic acid, nonyltetracarboxylic acid, nonyltetracarboxylic acid, nonyltetracarboxylic acid,
상기 이차전지는 리튬 이차전지인 것을 특징으로 하는 이차전지.
6. The method according to any one of claims 1 to 5,
Wherein the secondary battery is a lithium secondary battery.
A device according to claim 6, comprising a unit cell.
상기 디바이스는 전기자동차, 하이브리드 전기자동차, 플러그-인 하이브리드 전기자동차, 또는 전력저장장치 인 것을 특징으로 하는 디바이스.
8. The method of claim 7,
Wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.
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| US11024909B2 (en) | 2016-09-13 | 2021-06-01 | Lg Chem, Ltd. | Secondary battery having a case including a liquid-phase short-circuit prevention layer |
| KR20180115064A (en) * | 2017-04-12 | 2018-10-22 | 주식회사 엘지화학 | Battery Cell Comprising Hot-melting Adhesive Part |
| US11024929B2 (en) | 2018-01-09 | 2021-06-01 | Lg Chem, Ltd. | Battery pack including release cover |
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| KR101702071B1 (en) | 2017-02-02 |
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