KR102734115B1 - A positive electrode and an electrode assembly comprising the positive electrode - Google Patents
A positive electrode and an electrode assembly comprising the positive electrode Download PDFInfo
- Publication number
- KR102734115B1 KR102734115B1 KR1020180151258A KR20180151258A KR102734115B1 KR 102734115 B1 KR102734115 B1 KR 102734115B1 KR 1020180151258 A KR1020180151258 A KR 1020180151258A KR 20180151258 A KR20180151258 A KR 20180151258A KR 102734115 B1 KR102734115 B1 KR 102734115B1
- Authority
- KR
- South Korea
- Prior art keywords
- positive electrode
- cathode
- active material
- insulating coating
- coating portion
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
- 239000011248 coating agent Substances 0.000 claims abstract description 39
- 238000000576 coating method Methods 0.000 claims abstract description 39
- 239000007774 positive electrode material Substances 0.000 claims abstract description 22
- 239000007773 negative electrode material Substances 0.000 claims abstract description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 35
- 229910052759 nickel Inorganic materials 0.000 claims description 17
- 229920001940 conductive polymer Polymers 0.000 claims description 14
- 239000006182 cathode active material Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 9
- 229910017052 cobalt Inorganic materials 0.000 claims description 7
- 239000010941 cobalt Substances 0.000 claims description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 5
- 238000003475 lamination Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 12
- 239000010406 cathode material Substances 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- -1 Nickel-Cobalt-Manganese-Aluminum Chemical compound 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 150000002642 lithium compounds Chemical class 0.000 description 1
- 229910021450 lithium metal oxide Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/258—Modular batteries; Casings provided with means for assembling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
본 발명에 따른 양극은, 음극 및 분리막과 함께 적층되어 전극조립체를 구성하는 양극으로써, 판 모양의 양극집전체; 양극집전체의 표면에 도포되는 양극활물질; 및 상기 양극활물질이 표면에 도포된 유지부와 미도포된 무지부의 경계에 접착되는 절연코팅부;를 포함하고, 상기 절연코팅부는 순간적으로 발생하는 단락전류의 흐름은 방지하되, 과충전에 의한 미세전류의 흐름은 허용한다.
본 발명에 따른 전극조립체는, 양극집전체의 표면에 양극활물질이 도포된 유지부와 미도포된 무지부의 경계에서 상기 양극집전체의 표면에 절연코팅부가 부착된 양극; 음극집전체의 표면에 음극활물질이 도포된 음극; 및 상기 양극과 음극 사이에 적층되는 분리막;을 포함하고, 온도상승에 따른 분리막의 수축에 의해서 상기 양극의 절연코팅부에 상기 음극이 접촉하게 되면 상기 음극과 양극 사이로 미세전류가 흘러 충전량(SOC: State of charge)이 감소되는 것을 특징으로 한다.The positive electrode according to the present invention is a positive electrode that is laminated together with a negative electrode and a separator to form an electrode assembly, and includes a plate-shaped positive electrode current collector; a positive electrode active material applied to a surface of the positive electrode current collector; and an insulating coating portion adhered to a boundary between a holding portion on which the positive electrode active material is applied to a surface and a non-coated portion; wherein the insulating coating portion prevents the flow of a short-circuit current that occurs momentarily, but allows the flow of a microcurrent due to overcharge.
An electrode assembly according to the present invention comprises: a positive electrode having an insulating coating portion attached to the surface of a positive electrode current collector at a boundary between a supporting portion having a positive electrode active material applied to the surface of the positive electrode current collector and a non-coated non-coating portion; a negative electrode having a negative electrode active material applied to the surface of an negative electrode current collector; and a separator laminated between the positive electrode and the negative electrode, characterized in that when the negative electrode comes into contact with the insulating coating portion of the positive electrode due to shrinkage of the separator due to an increase in temperature, a microcurrent flows between the negative electrode and the positive electrode, thereby decreasing the state of charge (SOC).
Description
본 발명은 이차전지에 내장되는 전극조립체 및 상기 전극조립체를 구성하는 양극에 관한 것으로써, 더욱 상세하게는 니켈 함량이 높은 NCMA(Nickel-Cobalt-Manganese-Aluminum) 양극활물질을 사용할 때 발생할 수 있는 열폭주 현상을 방지할 수 있는 양극 및 상기 양극을 포함하는 전극조립체에 관한 것이다.The present invention relates to an electrode assembly built into a secondary battery and a cathode constituting the electrode assembly, and more specifically, to a cathode capable of preventing a thermal runaway phenomenon that may occur when using an NCMA (Nickel-Cobalt-Manganese-Aluminum) cathode active material having a high nickel content, and an electrode assembly including the cathode.
개인 휴대단말, 전기 자동차 분야를 포함하여 여러 분야에서 에너지원으로서 이차전지의 수요가 급격히 증가하고 있다.The demand for secondary batteries as an energy source is rapidly increasing in various fields, including personal mobile devices and electric vehicles.
일차전지와는 달리 충방전이 가능한 이차전지는 디지털 기기 뿐만 아니라 전기 자동차 등과 같은 운송수단용으로도 개발이 이뤄지고 있다.Unlike primary batteries, secondary batteries that can be recharged are being developed not only for digital devices but also for transportation such as electric vehicles.
이차전지는 양극과 음극의 재질 및 외부 형상에 따라 다양하게 분류될 수 있으나, 이 중에서 리튬 화합물 재질을 사용하는 리튬 이차전지는 용량이 크고 자가 방전율이 적어 다양한 기기의 전원장치로써 널리 사용되고 있다.Secondary batteries can be classified in various ways depending on the materials of the positive and negative electrodes and the external shape, but among these, lithium secondary batteries that use lithium compound materials have large capacity and low self-discharge rate, so they are widely used as power supplies for various devices.
그리고, 상기 리튬 이차전지는 다양한 형태로 제조 가능한데, 대표적으로 원통형(cylinder type), 각형(prismatic type), 파우치형(pouch type)으로 구분될 수 있다.In addition, the lithium secondary battery can be manufactured in various forms, and can be typically classified into a cylindrical type, a prismatic type, and a pouch type.
위와 같은 분류는 케이스의 형태에 따라서 나눠지되, 케이스의 형태와 상관없이 이차전지는 케이스 내부에 전기 에너지를 충방전하는 전극조립체가 내장되는 구조를 갖는다. 상기 전극조립체는 음극, 분리막, 양극이 반복적층되는 구조를 가지며, 전해액과 함께 케이스(파우치 또는 원통케이스 등)에 함께 내장된다.The above classification is divided according to the shape of the case, but regardless of the shape of the case, the secondary battery has a structure in which an electrode assembly for charging and discharging electric energy is built into the case. The electrode assembly has a structure in which a cathode, a separator, and anode are repeatedly laminated, and are built together with an electrolyte in a case (such as a pouch or cylindrical case).
상기 양극, 음극, 분리막 각각의 재료는 전지수명, 충방전 용량, 온도특성 및 안정성 등을 고려하여 선택되며, 리튬 이온이 양극의 리튬 금속 산화물로부터 음극으로 삽입(Intercalation) 및 탈리(Deintercalation)되는 과정이 반복되면서, 리튬 이차 전지의 충방전이 진행된다.The materials for each of the above positive electrode, negative electrode, and separator are selected in consideration of battery life, charge/discharge capacity, temperature characteristics, and stability, and the charging/discharging of a lithium secondary battery progresses as the process of lithium ions being inserted (intercalated) and deintercalated (deintercalated) from the lithium metal oxide of the positive electrode to the negative electrode is repeated.
한편, 상기 전극조립체는 대표적으로 권취형(젤리롤형), 적층형(스택형), 스택앤폴딩형 등으로 구분되어 제조된다. 이중 적층형 전극조립체는 금속 호일로 제조되는 집전체의 표면에 활물질을 코팅하고 건조 및 프레싱한 후, 요구되는 폭과 길이를 갖도록 재단하여 음극과 양극을 제조한 다음에 상기 음극과 양극 사이에 분리막을 적층하여 제조된다. Meanwhile, the electrode assembly is typically manufactured by dividing into a coiling type (jelly roll type), a stack type (stack type), and a stack-and-fold type. A double-stacked electrode assembly is manufactured by coating an active material on the surface of a current collector manufactured from a metal foil, drying and pressing it, then cutting it to have the required width and length to manufacture a negative electrode and a positive electrode, and then laminating a separator between the negative electrode and the positive electrode.
즉, 양극을 제조공정 중 노칭가공된 후 개별 양극(1)으로 절단되기 전의 모습이 도시된 도 1 에 도시된 바와 같이, 양극집전체가 연속적으로 공급되는 동안 상기 양극집전체의 표면에는 양극활물질(1a)이 도포되어 상기 양극활물질(1a)이 도포된 유지부와 미도포된 무지부(도 3 에 표시된 유지부와 무지부 참조)로 나눠지고, 상기 무지부는 전극탭(1b)으로 가공된다. That is, as shown in Fig. 1, which shows the appearance of the positive electrode before being cut into individual positive electrodes (1) after being notched during the manufacturing process, while the positive electrode current collector is continuously supplied, the positive electrode active material (1a) is applied to the surface of the positive electrode current collector, and is divided into a holding portion where the positive electrode active material (1a) is applied and a non-applied portion (see the holding portion and non-applied portion shown in Fig. 3), and the non-applied portion is processed into an electrode tab (1b).
그리고, 무지부와 유지부의 경계 부근에서 전극탭(1b)에는 양극활물질(1a)의 탈리를 방지하고 단락 발생 가능성을 낮추기 위해 상기 양극활물질(1a)의 도포와 함께(또는 양극활물질의 도포 전후에) 절연물질(1c)이 코팅되거나 절연테이프가 접착되었다. 이와 같이 가공된 후, 적절한 크기로 절단되어 개별 양극들(1)로 제조가 이뤄진다. And, in order to prevent detachment of the positive electrode active material (1a) and reduce the possibility of occurrence of a short circuit near the boundary between the non-conductive portion and the maintenance portion, an insulating material (1c) is coated or an insulating tape is adhered to the electrode tab (1b) together with the application of the positive electrode active material (1a) (or before or after the application of the positive electrode active material). After processing in this manner, it is cut into an appropriate size and manufactured into individual positive electrodes (1).
한편, 전기자동차용으로 사용되는 중대형 리튬이온전지의 경우, 부피당 에너지 밀도 증가를 위해 니켈(Ni) 함량이 높은 NCMA(Nickel-Cobalt-Manganese-Aluminum) 양극활물질이 도포된 양극이 사용된다.Meanwhile, in the case of medium and large-sized lithium-ion batteries used for electric vehicles, a cathode coated with NCMA (Nickel-Cobalt-Manganese-Aluminum) cathode active material with a high nickel (Ni) content is used to increase energy density per volume.
하지만, 니켈이 고함량 함유된 NCMA 양극활물질은 열안정성(thermal stability) 측면에서 매우 불안정한 측면이 있다. 가령, 차량의 운행조건을 고려해 차량에 탑재되는 이차전지는 150℃ 에서 2시간 이상 작동이 가능한 상태를 유지하여야 한다. However, NCMA cathode materials with high nickel content have a very unstable aspect in terms of thermal stability. For example, considering the vehicle's operating conditions, secondary batteries installed in vehicles must be able to operate at 150℃ for more than 2 hours.
이때, 양극에 접착된 절연물질(1c) 또는 절연테이프는 하드쇼트(hard short : 양극과 음극이 직접적으로 맞닿아 저항이 낮아지며 순간적으로 고전류가 흘러 발생하는 단락)에 의한 단락 발생을 방지하더라도, 이차전지 내부에서 이러한 고온에서는 온도상승에 따라 양극의 자가발열, 분리막 수축에 의한 하드쇼트등이 발생할 가능성을 완전하게 차단하긴 어려웠다.At this time, even if the insulating material (1c) or insulating tape attached to the positive electrode prevents a short circuit due to a hard short (a short circuit that occurs when the positive and negative electrodes directly contact each other, causing a decrease in resistance and a high current to flow momentarily), it was difficult to completely block the possibility of a hard short occurring due to self-heating of the positive electrode or shrinkage of the separator as a result of a temperature rise at such a high temperature inside the secondary battery.
특히, 이러한 문제는 이차전지가 만충전 상태일 때(SOC[State of charge]가 1[100%] 일때) 또는 SOC 가 1을 초과한 과충전 상태일 때 발생가능성이 급격히 상승하는 문제가 있었다.In particular, there was a problem in which the possibility of such problems occurring sharply increased when the secondary battery was fully charged (when the SOC [State of Charge] was 1 [100%]) or when the SOC exceeded 1 and was in an overcharged state.
따라서, 본 발명은 용량 증대를 위해 니켈이 고함량 함유된 NCMA 양극활물질을 사용하더라도 SOC 를 1 미만으로 의도적으로 낮춰서 열안정성을 높일 수 있는 양극 및 상기 양극을 포함하는 전극조립체를 제공하는 것에 주목적이 있다.Accordingly, the main purpose of the present invention is to provide a cathode and an electrode assembly including the cathode, which can increase thermal stability by intentionally lowering the SOC to less than 1 even when using an NCMA cathode active material having a high nickel content for capacity increase.
전술한 바와 같은 목적을 달성하기 위한 본 발명은, 음극 및 분리막과 함께 적층되어 전극조립체를 구성하는 양극에 있어서, 판 모양의 양극집전체; 양극집전체의 표면에 도포되는 양극활물질; 및 상기 양극활물질이 표면에 도포된 유지부와 미도포된 무지부의 경계에 접착되는 절연코팅부;를 포함하고, 상기 절연코팅부는 순간적으로 발생하는 단락전류의 흐름은 방지하되, 과충전에 의한 미세전류의 흐름은 허용하는 것을 특징으로 한다.In order to achieve the above-mentioned object, the present invention comprises a positive electrode configured to be laminated together with a negative electrode and a separator to form an electrode assembly, the positive electrode current collector having a plate shape; a positive electrode active material applied to a surface of the positive electrode current collector; and an insulating coating portion adhered to a boundary between a holding portion on which the positive electrode active material is applied to a surface and a non-coated portion; wherein the insulating coating portion is characterized in that it prevents the flow of a short-circuit current that occurs momentarily, but allows the flow of a microcurrent due to overcharge.
상기 절연코팅부는 전도성이 없는 폴리머와 전도성을 갖는 폴리머가 혼합되어 제조된다.The above insulating coating portion is manufactured by mixing a non-conductive polymer and a conductive polymer.
그리고, 상기 양극활물질은 니켈, 코발트, 망간, 알루미늄이 혼합되어 제조되되, 니켈, 코발트, 망간, 알루미늄 중 니켈의 함유율이 가장 높게 제조된다.And, the above cathode active material is manufactured by mixing nickel, cobalt, manganese, and aluminum, and is manufactured with the highest content of nickel among nickel, cobalt, manganese, and aluminum.
아울러, 상기 절연코팅부가 양극집전체의 표면에 접착됐을 때의 높이는 상기 양극집전체의 표면에 양극활물질이 도포된 높이 보다 낮거나 같게 구성된다.In addition, the height of the insulating coating portion when adhered to the surface of the positive electrode collector is configured to be lower than or equal to the height at which the positive electrode active material is applied to the surface of the positive electrode collector.
또한, 본 발명은 위와 같은 양극을 포함하는 전극조립체를 추가적으로 제공한다. 본 발명에 따른 전극조립체는 양극집전체의 표면에 양극활물질이 도포된 유지부와 미도포된 무지부의 경계에서 상기 양극집전체의 표면에 절연코팅부가 부착된 양극; 음극집전체의 표면에 음극활물질이 도포된 음극; 및 상기 양극과 음극 사이에 적층되는 분리막;을 포함하고, 온도상승에 따른 분리막의 수축에 의해서 상기 양극의 절연코팅부에 상기 음극이 접촉하게 되면 상기 음극과 양극 사이로 미세전류가 흘러 충전량(SOC: State of charge)이 감소되는 것을 특징으로 한다.In addition, the present invention additionally provides an electrode assembly including the positive electrode as described above. The electrode assembly according to the present invention includes a positive electrode having an insulating coating portion attached to the surface of a positive electrode current collector at a boundary between a supporting portion having a positive electrode active material applied to the surface of the positive electrode current collector and a non-coated non-coated portion; a negative electrode having a negative electrode active material applied to the surface of an anode current collector; and a separator laminated between the positive electrode and the negative electrode, and is characterized in that when the negative electrode comes into contact with the insulating coating portion of the positive electrode due to shrinkage of the separator due to an increase in temperature, a microcurrent flows between the negative electrode and the positive electrode, thereby decreasing the state of charge (SOC).
상기 양극은 분리막과 적층될 때, 절연코팅부가 상기 분리막과 맞닿은 상태로 적층이 이뤄진다. 그리고, 상기 음극은 양극 보다 더 긴 길이를 갖는다.When the above anode is laminated with a separator, the lamination is performed in a state where the insulating coating portion is in contact with the separator. In addition, the cathode has a longer length than the anode.
이와 같은 전극조립체는 파우치에 내장되어 이차전지로 제조될 수 있으며, 상기 이차전지들은 복수 개가 서로 간에 전기적으로 연결되어 이차전지모듈로 제조될 수 있다.An electrode assembly like this can be manufactured into a secondary battery by being built into a pouch, and a plurality of the secondary batteries can be electrically connected to each other to manufacture a secondary battery module.
상기와 같은 구성을 갖는 본 발명은 절연코팅부가 순간적으로 발생하는 단락전류의 흐름은 방지하면서도 과충전에 의한 미세전류의 흐름은 허용함으로써 위험온도에 도달하기 전에 SOC 가 감소되어 열폭주 현상발생을 방지할 수 있다.The present invention having the above configuration prevents the flow of short-circuit current that occurs momentarily in the insulating coating portion while allowing the flow of microcurrent due to overcharge, thereby reducing the SOC before reaching a dangerous temperature and preventing the occurrence of a thermal runaway phenomenon.
상기 절연코팅부는 종래에 사용되던 전도성이 없는 폴리머에 전도성을 갖는 폴리머를 첨가하여 제조될 수 있으므로 종래의 생산공정을 그대로 사용할 수 있다. 즉, 생산공정의 변경없이 제조되므로 생산비 증가를 억제할 수 있다.Since the above-mentioned insulating coating part can be manufactured by adding a conductive polymer to a conventionally used non-conductive polymer, the conventional production process can be used as is. In other words, since it is manufactured without changing the production process, an increase in production costs can be suppressed.
도 1 은 양극 제조 공정 중 노칭가공된 후 개별 양극으로 절단되기 전의 모습이 도시된 평면도.
도 2 는 본 발명의 제1실시예에 따른 양극의 평면도.
도 3 은 본 발명의 제1실시예에 따른 양극의 측면도.
도 4 는 본 발명의 제2실시예에 따른 전극조립체 일부분의 측면도.
도 5 는 도 4 의 'A' 부분 확대도로써, 절연코팅부가 대전류의 흐름은 차단하고, 미세전류의 흐름은 허용하는 것을 표시한 도면.
도 6 은 본 발명에 따른 양극이 적층된 전극조립체에서 과충전이 발생했을 때 SOC 가 하강하여 온도가 떨어지는 것이 표시된 그래프.Figure 1 is a plan view showing the appearance before being cut into individual anodes after being notched during the anode manufacturing process.
Figure 2 is a plan view of an anode according to the first embodiment of the present invention.
Figure 3 is a side view of an anode according to the first embodiment of the present invention.
Figure 4 is a side view of a portion of an electrode assembly according to a second embodiment of the present invention.
Figure 5 is an enlarged view of part 'A' of Figure 4, showing that the insulating coating portion blocks the flow of large current and allows the flow of microcurrent.
Figure 6 is a graph showing that the SOC decreases and the temperature drops when overcharge occurs in an electrode assembly having stacked positive electrodes according to the present invention.
이하, 첨부된 도면에 의거하여 본 발명에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. 그러나 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다.Hereinafter, the present invention will be described in detail based on the attached drawings so that a person having ordinary skill in the art to which the present invention pertains can easily practice the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.
본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서는 동일한 참조 부호를 붙이도록 한다.In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.
또한, 본 명세서 및 특허청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정하여 해석되어서는 안되며, 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.In addition, terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of the present invention based on the principle that an inventor can appropriately define the concept of a term in order to explain his or her own invention in the best way.
본 발명은 용량 증대를 위해 니켈이 고함량으로 함유된 양극활물질을 사용하더라도 열안정성을 높일 수 있는 양극(10) 및 상기 양극을 포함하는 전극조립체에 관한 것이다. 본 발명은 양극을 제1실시예로 제공하고, 상기 양극이 포함된 전극조립체를 제2실시예로 제공한다. 이하, 도면을 참조하여 본 발명에 따른 실시예들을 보다 더 상세하게 설명한다.The present invention relates to a positive electrode (10) capable of increasing thermal stability even when using a positive electrode active material containing a high nickel content for capacity increase, and an electrode assembly including the positive electrode. The present invention provides the positive electrode as a first embodiment, and an electrode assembly including the positive electrode as a second embodiment. Hereinafter, embodiments according to the present invention will be described in more detail with reference to the drawings.
제1실시예First embodiment
본 발명은 전극조립체에 적층되는 양극(10)을 제1실시예로 제공한다. 도 2 와 도 3 은 본 발명의 제1실시예에 따른 양극(10)의 평면도와 측면도를 도시하였다. The present invention provides a positive electrode (10) laminated on an electrode assembly as a first embodiment. Figures 2 and 3 illustrate a plan view and a side view of the positive electrode (10) according to the first embodiment of the present invention.
도면을 참조하면, 상기 양극(10)은 사각형 판 모양의 양극집전체(11)의 양면 각각의 표면에 양극활물질(12)이 도포되고 절연코팅부(13)가 도포 또는 코팅된다. 이때, 상기 절연코팅부(13)는 양극활물질(12)이 표면에 도포된 양극집전체(11)의 유지부와 양극활물질(12)이 표면에 미도포된 무지부의 경계를 이루는 위치(도 3 에 도시된 바와 같이 상면 또는 하면은 무지부에 접하고 측면은 양극활물질에 접하는 위치)에 배치된다. 상기 절연코팅부(13)는 분리막의 수축이 발생하더라도 양극집전체(11)가 음극집전체에 직접적으로 맞닿아 저항이 낮아지며 대전류가 흐름으로써 순간적으로 발생하는 하드쇼트(hard short)를 방지하는 기능을 제공한다.Referring to the drawing, the positive electrode (10) is formed by applying a positive electrode active material (12) to each surface of both sides of a square plate-shaped positive electrode collector (11) and applying or coating an insulating coating portion (13). At this time, the insulating coating portion (13) is positioned at a boundary between a support portion of the positive electrode collector (11) on which the positive electrode active material (12) is applied to the surface and a non-coated portion on which the positive electrode active material (12) is not applied to the surface (as shown in FIG. 3, the upper or lower surface is in contact with the non-coated portion and the side is in contact with the positive electrode active material). The insulating coating portion (13) provides a function of preventing a hard short that occurs momentarily when the positive electrode collector (11) directly contacts the negative electrode collector, thereby lowering the resistance and allowing a large current to flow even when shrinkage of the separator occurs.
하지만, 본 발명에 따른 상기 절연코팅부(13)는 순간적으로 발생하는 단락전류의 흐름은 방지하되, 과충전에 의한(또는 만충전 상태일 때) 미세전류의 흐름은 허용하도록 구성된다.However, the insulating coating portion (13) according to the present invention is configured to prevent the flow of short-circuit current that occurs momentarily, but to allow the flow of microcurrent due to overcharge (or when in a fully charged state).
다른 조합들도 가능할 것이나, 이 실시예에서 상기 절연코팅부(13)는 전기 전도성이 없는 폴리머와 전기 전도성을 갖는 폴리머가 혼합되어 제조된다. 이때, 전도성 폴리머와 비전도성폴리머의 혼합비 및 혼합방법은 반복 실험 등을 통해 최적의 값으로 선정될 수 있다.Other combinations may be possible, but in this embodiment, the insulating coating portion (13) is manufactured by mixing a non-conductive polymer and an electrically conductive polymer. At this time, the mixing ratio and mixing method of the conductive polymer and the non-conductive polymer can be selected as optimal values through repeated experiments, etc.
아울러, 도 3 에 도시된 바와 같이 이 실시예에서 상기 절연코팅부(13)가 양극집전체(11)의 표면에 접착됐을 때의 높이는 상기 양극집전체(11)의 표면에 양극활물질(12)이 도포된 높이와 같게 구성되거나 약간 낮게 구성될 수 있다. In addition, as shown in FIG. 3, in this embodiment, the height of the insulating coating portion (13) when adhered to the surface of the positive electrode current collector (11) may be configured to be the same as or slightly lower than the height at which the positive electrode active material (12) is applied to the surface of the positive electrode current collector (11).
제2실시예Second embodiment
본 발명은 위와 같은 양극(10)을 포함하는 전극조립체를 제2실시예로 제공한다.The present invention provides an electrode assembly including the above-described positive electrode (10) as a second embodiment.
도 4 는 본 발명의 제2실시예에 따른 전극조립체 일부분의 측면도이고, 도 5 는 도 4 의 'A' 부분 확대도로써, 절연코팅부가 대전류의 흐름은 차단하고(A), 미세전류의 흐름은 허용하는 것(B)을 표시한 도면이다. 도 4, 5 를 참조하면, 본 발명에 따른 전극조립체는 양극집전체(11)의 표면에 양극활물질(12)이 도포된 유지부와 미도포된 무지부의 경계에서 상기 양극집전체(11)의 표면에 절연코팅부(13)가 부착된 양극(10); 음극집전체(21)의 표면에 음극활물질(22)이 도포된 음극(20); 및 상기 양극(10)과 음극(20) 사이에 적층되는 분리막(30);을 포함하여 적층되는 구조를 갖는다. FIG. 4 is a side view of a part of an electrode assembly according to a second embodiment of the present invention, and FIG. 5 is an enlarged view of part 'A' of FIG. 4, which is a drawing showing that an insulating coating part blocks the flow of large current (A) and allows the flow of microcurrent (B). Referring to FIGS. 4 and 5, the electrode assembly according to the present invention has a laminated structure including a positive electrode (10) having an insulating coating part (13) attached to the surface of a positive electrode current collector (11) at a boundary between a supporting part on which a positive electrode active material (12) is coated on the surface of the positive electrode current collector (11) and a non-coated non-coated part; a negative electrode (20) having a negative electrode active material (22) coated on the surface of an negative electrode current collector (21); and a separator (30) laminated between the positive electrode (10) and the negative electrode (20).
그리고, 이때, 온도상승에 따른 분리막(30)의 수축에 의해서 상기 양극(10)의 절연코팅부(13)에 상기 음극(20)이 접촉하게 되면 상기 음극(20)과 양극(10) 사이로 미세전류가 흘러 충전량(SOC: State of charge)이 감소된다.And, at this time, when the cathode (20) comes into contact with the insulating coating portion (13) of the anode (10) due to the shrinkage of the separator (30) due to the temperature rise, a microcurrent flows between the cathode (20) and the anode (10), thereby reducing the state of charge (SOC).
상기 양극(10)은 분리막(30)과 적층될 때, 절연코팅부(13)가 상기 분리막(30)과 맞닿은 상태로 적층이 이뤄지고, 상기 음극(20)은 양극(10) 보다 더 긴 길이를 갖는다. 상기 분리막(30)은 고온이 발생하면 수축이 발생할 수 있으며, 수축이 이뤄질 때 절연코팅부(13)는 음극(20)의 음극활물질(22) 또는 음극집전체(21)에 맞닿을 수 있다.When the above positive electrode (10) is laminated with the separator (30), the insulating coating portion (13) is laminated in a state where it comes into contact with the separator (30), and the negative electrode (20) has a longer length than the positive electrode (10). The separator (30) may shrink when a high temperature occurs, and when shrinkage occurs, the insulating coating portion (13) may come into contact with the negative electrode active material (22) of the negative electrode (20) or the negative electrode current collector (21).
이와 같은 전극조립체는 파우치에 내장되어 이차전지로 제조될 수 있으며, 상기 이차전지들은 복수 개가 서로 간에 전기적으로 연결되어 이차전지모듈로 제조될 수 있다.An electrode assembly like this can be manufactured into a secondary battery by being built into a pouch, and a plurality of the secondary batteries can be electrically connected to each other to manufacture a secondary battery module.
한편, 본 발명의 실시예1, 2 에서 상기 양극활물질(12)은 니켈, 코발트, 망간, 알루미늄이 혼합되어 제조되되, 이 중 니켈의 함유율이 가장 높게 제조된다. 즉, 상기 양극활물질(12)은 NCMA(니켈-코발트-망간-알루미늄)양극재이다. NCMA 양극재는 NCM(니켈-코발트-망간)양극재에 알루미늄을 추가로 첨가하는 대신 코발트의 비중을 10% 이하로 낮춘 양극재로써 부피당 에너질 밀도가 증가되는 장점을 갖는다. Meanwhile, in Examples 1 and 2 of the present invention, the cathode active material (12) is manufactured by mixing nickel, cobalt, manganese, and aluminum, and among these, the content of nickel is manufactured to be the highest. That is, the cathode active material (12) is an NCMA (nickel-cobalt-manganese-aluminum) cathode material. The NCMA cathode material is a cathode material in which aluminum is additionally added to the NCM (nickel-cobalt-manganese) cathode material, but the specific gravity of cobalt is lowered to 10% or less, and has the advantage of increased energy density per volume.
하지만, 일반적으로 NCMA 양극재는 니켈 함량이 높아 에너지 밀도가 증가하여 배터리 성능이 향상되고 비싼 코발트 비중이 낮아져 생산원가가 낮아지는 장점을 가지나, 니켈 함량이 증가할 수록 열안정성(thermal stability)이 불안정해지는 단점이 있다. However, in general, NCMA cathode materials have the advantage of increased energy density due to high nickel content, which improves battery performance, and lowers production costs due to lower proportion of expensive cobalt, but have the disadvantage of unstable thermal stability as nickel content increases.
그러나, 본 발명이 적용되는 이차전지는 과충전 또는 만충전 상태일때(SOC 가 1 이상일 때) 양극과 음극 사이의 미세전류의 흐름을 허용하여 충전전압을 낮춤으로써 SOC 를 1 미만으로 떨어뜨려 열적안정성을 확보할 수 있다.However, the secondary battery to which the present invention is applied can secure thermal stability by lowering the charging voltage by allowing the flow of microcurrent between the positive and negative electrodes when in an overcharged or fully charged state (when the SOC is 1 or higher), thereby lowering the SOC to less than 1.
즉, 양극활물질(12)에 니켈이 높게 함유될 경우 종래 구조에서는 이차전지가 대략 150℃ 이상까지 도달한 후, 10분 전후로 자가 발열에 의해 발화가 발생하는 경우가 많았다. 하지만, 본 발명에 따른 양극이 적층된 전극조립체에서는 양극활물질(12)에 동일비율로 니켈이 함유된 경우라도 도 6 에 도시된 바와 같이, 150℃ 근방에서 SOC가 떨어지는 효과로 150℃ 에 도달 후에도 꾸준히 SOC가 빠지면서 발화가 발생하지 않았다. 즉, 미세전류가 흐름에 따라 충전전류가 소모되면서 충전전압이 낮아지고 시간이 지남에 따라 전극조립체 바디 자체의 온도가 완만하게 하강하게 된다.That is, when the positive electrode active material (12) contains a high amount of nickel, in the conventional structure, after the secondary battery reaches about 150°C or higher, there were many cases where ignition occurred due to self-heating in about 10 minutes. However, in the electrode assembly in which the positive electrodes are laminated according to the present invention, even when the positive electrode active material (12) contains nickel at the same ratio, as shown in FIG. 6, even after reaching 150°C, the SOC steadily decreased due to the effect of the SOC dropping around 150°C, so that ignition did not occur. That is, as the charging current is consumed as the microcurrent flows, the charging voltage decreases, and the temperature of the electrode assembly body itself gradually decreases over time.
상기와 같은 구성을 갖는 본 발명은 절연코팅부(13)가 순간적으로 발생하는 단락전류의 흐름은 방지하면서도 과충전에 의한 양극(10)과 음극(20) 사이의 미세전류의 흐름은 허용함으로써 위험온도에 도달하기 전에 SOC 가 감소되어 열폭주 현상발생을 방지할 수 있다.The present invention having the above configuration prevents the flow of short-circuit current that occurs momentarily through the insulating coating portion (13) while allowing the flow of microcurrent between the positive electrode (10) and the negative electrode (20) due to overcharge, thereby reducing the SOC before reaching a dangerous temperature and preventing the occurrence of a thermal runaway phenomenon.
상기 절연코팅부(13)는 종래에 사용되던 전도성이 없는 폴리머에 전도성을 갖는 폴리머를 첨가하여 제조될 수 있으므로 종래의 생산공정을 그대로 사용할 수 있다. 즉, 생산공정의 변경없이 제조되므로 생산비 증가를 억제할 수 있다.The above-mentioned insulating coating portion (13) can be manufactured by adding a conductive polymer to a non-conductive polymer used in the past, so that the conventional production process can be used as is. In other words, since it is manufactured without changing the production process, an increase in production costs can be suppressed.
이상에서 본 발명은 비록 한정된 실시예와 도면에 의해 설명되었으나, 본 발명은 이것에 의해 한정되지 않으며, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 본 발명의 기술사상과 아래에 기재될 특허청구범위의 균등범위 내에서 다양한 실시가 가능하다.Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto, and various embodiments are possible within the scope equivalent to the technical idea of the present invention and the scope of the patent claims to be described below by a person skilled in the art to which the present invention pertains.
10 : 양극
11 : 양극집전체
12 : 양극활물질
13 : 절연코팅부
20 : 음극
30 : 분리막10 : Bipolar
11: Bipolar collector
12: Bipolar active material
13: Insulating coating part
20 : Negative
30 : Membrane
Claims (10)
판 모양의 양극집전체;
양극집전체의 표면에 도포되는 양극활물질; 및
상기 양극활물질이 표면에 도포된 유지부와 미도포된 무지부의 경계에 접착되는 절연코팅부;를 포함하고,
상기 절연코팅부는 분리막의 수축에 의해 음극과 접촉하여 순간적으로 발생하는 단락전류의 흐름은 방지하되, 과충전에 의한 미세전류의 흐름은 허용하며,
상기 절연코팅부는 전도성이 없는 폴리머와 전도성을 갖는 폴리머가 혼합되어 제조되는 것을 특징으로 하는 양극.
In the positive electrode, which is laminated together with the negative electrode and the separator to form an electrode assembly,
Plate-shaped anode collector;
A cathode active material applied to the surface of the cathode current collector; and
Including an insulating coating portion adhered to the boundary between the maintenance portion on which the above-mentioned positive electrode active material is applied to the surface and the uncoated portion;
The above insulating coating portion prevents the flow of short-circuit current that occurs momentarily when the separator contracts and comes into contact with the cathode, but allows the flow of microcurrent due to overcharging.
An anode characterized in that the insulating coating portion is manufactured by mixing a non-conductive polymer and a conductive polymer.
상기 양극활물질은 니켈, 코발트, 망간, 알루미늄이 혼합되어 제조된 것을 특징으로 하는 양극.
In paragraph 1,
The above cathode active material is a cathode characterized in that it is manufactured by mixing nickel, cobalt, manganese, and aluminum.
상기 양극활물질은 니켈, 코발트, 망간, 알루미늄 중 니켈의 함유율이 가장 높은 것을 특징으로 하는 양극.
In the third paragraph,
The above cathode active material is a cathode characterized by having the highest content of nickel among nickel, cobalt, manganese, and aluminum.
상기 절연코팅부가 양극집전체의 표면에 접착됐을 때의 높이는 상기 양극집전체의 표면에 양극활물질이 도포된 높이 보다 낮거나 같은 것을 특징으로 하는 양극.
In paragraph 1,
A cathode characterized in that the height of the insulating coating portion when adhered to the surface of the cathode current collector is lower than or equal to the height of the cathode active material applied to the surface of the cathode current collector.
음극집전체의 표면에 음극활물질이 도포된 음극; 및
상기 양극과 음극 사이에 적층되는 분리막;을 포함하고,
상기 절연코팅부는 전도성이 없는 폴리머와 전도성을 갖는 폴리머가 혼합되어 제조되고,
과충전 또는 만충전 상태에서 온도상승에 따른 분리막의 수축에 의해서 상기 양극의 절연코팅부에 상기 음극이 접촉하게 되면 상기 음극과 양극 사이로 미세전류가 흘러 충전량이 감소되며 온도가 하강하는 것을 특징으로 하는 전극조립체.
A cathode having an insulating coating attached to the surface of the cathode current collector at the boundary between a support portion where a cathode active material is applied to the surface of the cathode current collector and a non-coated non-coated portion;
A negative electrode having a negative electrode active material applied to the surface of a negative electrode collector; and
A separator laminated between the positive and negative electrodes;
The above insulating coating portion is manufactured by mixing a non-conductive polymer and a conductive polymer.
An electrode assembly characterized in that when the cathode comes into contact with the insulating coating portion of the anode due to shrinkage of the separator caused by a rise in temperature in an overcharged or fully charged state, a microcurrent flows between the cathode and the anode, the charge amount decreases, and the temperature drops.
상기 양극은 분리막과 적층될 때, 절연코팅부가 상기 분리막과 맞닿은 상태로 적층이 이뤄지는 것을 특징으로 하는 전극조립체.
In paragraph 6,
An electrode assembly characterized in that, when the above anode is laminated with a separator, the lamination is performed in a state where the insulating coating portion is in contact with the separator.
상기 음극은 양극 보다 더 긴 길이를 갖는 것을 특징으로 하는 전극조립체.
In paragraph 6,
An electrode assembly characterized in that the cathode has a longer length than the anode.
A secondary battery in which the electrode assembly of any one of claims 6 to 8 is embedded in a pouch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020180151258A KR102734115B1 (en) | 2018-11-29 | 2018-11-29 | A positive electrode and an electrode assembly comprising the positive electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020180151258A KR102734115B1 (en) | 2018-11-29 | 2018-11-29 | A positive electrode and an electrode assembly comprising the positive electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20200064752A KR20200064752A (en) | 2020-06-08 |
| KR102734115B1 true KR102734115B1 (en) | 2024-11-26 |
Family
ID=71090073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020180151258A Active KR102734115B1 (en) | 2018-11-29 | 2018-11-29 | A positive electrode and an electrode assembly comprising the positive electrode |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR102734115B1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993378A (en) * | 2021-03-26 | 2021-06-18 | 天津市捷威动力工业有限公司 | Electrode assembly applied to lithium secondary battery |
| JP7776501B2 (en) * | 2021-08-27 | 2025-11-26 | エルジー エナジー ソリューション リミテッド | Method for manufacturing secondary battery electrodes using insulating composition containing aqueous binder substituted with non-aqueous solvent |
| EP4231437A4 (en) * | 2021-12-29 | 2025-01-15 | Contemporary Amperex Technology (Hong Kong) Limited | INSULATING SLURRY AND MANUFACTURING METHOD THEREOF, POSITIVE ELECTRODE PLATE, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND ELECTRICAL APPARATUS |
| CN115513532A (en) * | 2022-09-02 | 2022-12-23 | 中国第一汽车股份有限公司 | A kind of anti-short circuit solid-state battery and preparation method thereof |
| WO2024101033A1 (en) * | 2022-11-11 | 2024-05-16 | 株式会社村田製作所 | Secondary battery and method for manufacturing secondary battery |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017212040A (en) | 2016-05-23 | 2017-11-30 | オートモーティブエナジーサプライ株式会社 | Lithium ion secondary battery |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100833796B1 (en) * | 2004-11-10 | 2008-05-30 | 주식회사 엘지화학 | Secondary battery with improved thermal stability |
| KR100874385B1 (en) * | 2006-07-10 | 2008-12-18 | 주식회사 엘지화학 | Secondary battery safety member |
| KR100883752B1 (en) * | 2006-07-26 | 2009-02-12 | 주식회사 엘지화학 | New organic / inorganic composite electrolyte and electrochemical device with improved thermal safety |
| KR20140009037A (en) * | 2012-07-11 | 2014-01-22 | 주식회사 엘지화학 | Electrode assembly and electrochemical cell containing the same |
| KR20180013103A (en) * | 2016-07-28 | 2018-02-07 | 주식회사 엘지화학 | Lithium secondary battery of improved safety of nail penetration |
-
2018
- 2018-11-29 KR KR1020180151258A patent/KR102734115B1/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017212040A (en) | 2016-05-23 | 2017-11-30 | オートモーティブエナジーサプライ株式会社 | Lithium ion secondary battery |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20200064752A (en) | 2020-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102734115B1 (en) | A positive electrode and an electrode assembly comprising the positive electrode | |
| CN101652893B (en) | Gel rolls with different loadings of active material layers | |
| JP5465792B2 (en) | Cable type secondary battery | |
| JP5492999B2 (en) | Cable type secondary battery | |
| US7399554B2 (en) | Hybrid rechargeable battery having high power and high energy density lithium cells | |
| EP1914820B1 (en) | Battery module | |
| KR101664244B1 (en) | Method forming electrode surface pattern and the electrode manufactured by the method and secondary battery including the same | |
| KR20200087437A (en) | Lithium Metal Electrode and Lithium Secondary Battery Comprising the Same | |
| KR102619895B1 (en) | Secondary Battery | |
| KR20180058333A (en) | Electrode for Secondary Battery Comprising Layer for Protecting Electrode Layer | |
| US11929500B2 (en) | Electrode assembly | |
| KR101154872B1 (en) | Electrode Assembly of Novel Structure | |
| KR101935229B1 (en) | Lithium secondary battery | |
| KR102279002B1 (en) | Electrode Assembly | |
| EP2946433B1 (en) | Electrochemical cell or battery with reduced impedance and method for producing same | |
| KR101515672B1 (en) | Electrode assembly including anode and cathod electrode more than 2 and electrochemical device using the same | |
| US20130230756A1 (en) | Secondary battery and manufacturing method thereof | |
| CN107548525B (en) | Separator and battery cells for battery cells | |
| KR20140017766A (en) | Secondary battery | |
| US20240283104A1 (en) | Electrode Tab and Method for Cutting Electrode Tab | |
| KR101587921B1 (en) | Anode For Cable type Secondary Battery, A Manufacturing Method of The Same And Cable type Secondary Battery Having The Same | |
| KR100601563B1 (en) | Cylindrical Li-ion Secondary Battery | |
| US20250158028A1 (en) | Electrode plate, electrode assembly and secondary battery | |
| KR20010037835A (en) | Lithium ion polymer battery | |
| JP2025021819A (en) | Method for activating non-aqueous electrolyte secondary battery and method for manufacturing non-aqueous electrolyte secondary battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PA0109 | Patent application |
Patent event code: PA01091R01D Comment text: Patent Application Patent event date: 20181129 |
|
| PG1501 | Laying open of application | ||
| N231 | Notification of change of applicant | ||
| PN2301 | Change of applicant |
Patent event date: 20210524 Comment text: Notification of Change of Applicant Patent event code: PN23011R01D |
|
| E902 | Notification of reason for refusal | ||
| PE0902 | Notice of grounds for rejection |
Comment text: Notification of reason for refusal Patent event date: 20240126 Patent event code: PE09021S01D |
|
| E701 | Decision to grant or registration of patent right | ||
| PE0701 | Decision of registration |
Patent event code: PE07011S01D Comment text: Decision to Grant Registration Patent event date: 20240828 |
|
| GRNT | Written decision to grant | ||
| PR0701 | Registration of establishment |
Comment text: Registration of Establishment Patent event date: 20241120 Patent event code: PR07011E01D |
|
| PR1002 | Payment of registration fee |
Payment date: 20241121 End annual number: 3 Start annual number: 1 |
|
| PG1601 | Publication of registration |