KR102716985B1 - Electrode assembly - Google Patents
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- 239000011149 active material Substances 0.000 claims description 6
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 claims description 5
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
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- 238000004804 winding Methods 0.000 description 1
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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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
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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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
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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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
- H01M50/457—Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
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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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
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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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
- H01M50/466—U-shaped, bag-shaped or folded
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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
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- 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
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Abstract
본 발명은, 단위셀들 복수 개가 폴딩분리막 위에 나란히 놓이면 상기 폴딩분리막의 일측에서부터 타측으로 상기 단위셀들의 적층이 이뤄지도록 폴딩하여 제조되는 전극조립체에 있어서, 최상층 또는 최하층에 적층되도록 가장 마지막에 폴딩되는 단위셀은 상기 폴딩분리막과 접하게되는 상면과 하면 중 어느 한 면 또는 두 면 모두에 상기 폴딩분리막과 접착이 이루어지도록 바인더가 도포된 것을 특징으로 한다.
전술한 바와 같은 구성을 갖는 본 발명은, 가장 마지막에 폴딩되는 단위셀 위로 폴딩분리막이 올려지면 바인더에 의해 추가적인 접착이 이루어져 테이프의 접착력을 보완하거나 대신할 수 있으므로 상기 폴딩분리막의 주름 불량 또는 외관불량 발생을 방지할 수 있다.The present invention relates to an electrode assembly manufactured by folding a plurality of unit cells so that the unit cells are stacked from one side of the folding separator to the other side when the unit cells are placed side by side on a folding separator, wherein the unit cell that is folded last so as to be stacked in the uppermost or lowermost layer has a binder applied to one or both of the upper and lower surfaces that come into contact with the folding separator so as to be adhered to the folding separator.
The present invention having the configuration described above can prevent occurrence of wrinkles or appearance defects in the folding separator by supplementing or replacing the adhesive strength of the tape by additional adhesion through a binder when the folding separator is placed over the unit cell that is folded last.
Description
본 발명은 스택 앤 폴딩(Stack&Folding) 방식으로 제조되는 전극조립체에 관한 것으로써, 더욱 상세하게는 폴딩분리막을 마감하는 테이프를 대신하거나 상기 테이프와는 별개로 추가적으로 접착력을 보강하여 폴딩분리막의 주름 불량, 외관 불량 문제를 해소할 수 있는 전극조립체에 관한 것이다.The present invention relates to an electrode assembly manufactured by the stack & folding method, and more specifically, to an electrode assembly capable of resolving problems of wrinkle defects and poor appearance of a folding separator by replacing a tape for finishing a folding separator or additionally reinforcing adhesive strength separately from the tape.
전기 에너지를 저장하는 전지는 일반적으로 일차 전지와 이차 전지로 구분될 수 있다. 일차 전지는 일회용 소모성 전지인 반면에, 이차 전지는 전류와 물질 사이의 산화 및 환원 과정이 반복 가능한 소재를 사용하여 제조되는 충전식 전지이다. 즉, 전류에 의해 소재에 대한 환원 반응이 수행되면 전원이 충전되고, 소재에 대한 산화 반응이 수행되면 전원이 방전되는데, 이와 같은 충전-방전이 반복적으로 수행가능하다.Batteries that store electrical energy can generally be divided into primary batteries and secondary batteries. Primary batteries are disposable consumable batteries, while secondary batteries are rechargeable batteries manufactured using materials that can repeat oxidation and reduction processes between current and substances. That is, when a reduction reaction is performed on a material by current, the power is charged, and when an oxidation reaction is performed on a material, the power is discharged, and such charging and discharging can be performed repeatedly.
여러 종류의 이차전지 중, 리튬 이차 전지는 일반적으로 양극(Cathode), 분리막(Separator) 및 음극(Anode)이 적층된 전극조립체가 케이스에 장착되어 제조되며, 리튬 이온이 양극의 리튬 금속 산화물로부터 음극으로 삽입(Intercalation) 및 탈리(Deintercalation)되는 과정이 반복되면서, 리튬 이차 전지의 충방전이 진행된다.Among various types of secondary batteries, lithium secondary batteries are generally manufactured by mounting an electrode assembly in which a cathode, a separator, and an anode are laminated in a case, and the charging and discharging of the lithium secondary battery progresses as the process of lithium ions being inserted (intercalated) and deintercalated (deintercalated) from the lithium metal oxide of the cathode to the anode is repeated.
상기 전극조립체는 일반적으로 양극/분리막/음극의 3층 구조, 또는 양극/분리막/음극/분리막/양극 또는 음극/분리막/양극/분리막/음극의 5층 구조 또는 그 이상으로 적층된 단위셀들이 정해진 수량만큼 적층되어 하나의 전극 조립체가 된다. 그리고 이러한 전극조립체는 원통형 캔 또는 각형 파우치 등과 같은 케이스에 수용된다.The above electrode assembly is generally composed of a three-layer structure of anode/separator/cathode, or a five-layer structure of anode/separator/cathode/separator/anode or cathode/separator/anode/separator/cathode, or more, in which unit cells are laminated in a set quantity to form one electrode assembly. And this electrode assembly is accommodated in a case such as a cylindrical can or a square pouch.
한편, 상기 전극조립체를 제조하는 방식으로써, 상기 음극과 양극 사이에 분리막을 적층한 후 감아서 제조하는 권취형, 요구되는 폭과 길이를 갖도록 재단하여 음극과 양극을 절단한 후, 상기 음극, 분리막, 양극이 반복되도록 적층하여 제조하는 적층형 및 폴딩분리막 위에 단위셀들을 나란히 올려놓은 후 일측부터 폴딩하여 제조하는 스택앤폴딩형 등이 공지된 바 있다.Meanwhile, as a method for manufacturing the electrode assembly, a winding type in which a separator is laminated between the cathode and the anode and then rolled up is manufactured, a lamination type in which the cathode and the anode are cut to have the required width and length and then laminated so that the cathode, separator, and anode are repeatedly manufactured, and a stack-and-folding type in which unit cells are placed side by side on a folding separator and then folded from one side are manufactured, etc. have been known.
상기 스택앤폴딩형은 권취형과 적층형의 혼합된 형태를 갖는다. 즉, 도 1 에 도시된 바와 같이, 일정한 크기로 양극, 분리막, 음극이 적층된 단위셀들(10a, 10c)이 폴딩분리막(20)의 길이방향을 따라 그 위에 놓여진 후, 일측에서부터 타측으로 폴딩되어 적층된 구조를 갖는다. The above stack-and-fold type has a mixed form of a roll-up type and a stacked type. That is, as shown in Fig. 1, unit cells (10a, 10c) in which a positive electrode, a separator, and a negative electrode are stacked in a certain size are placed on the folding separator (20) along the length direction, and then folded from one side to the other to have a stacked structure.
이때, 적층된 전극조립체는 음극과 양극이 순서대로 반복적층이 이뤄지도록 적층되는 위치에 따라서 상기 단위셀은 양극/분리막/음극/분리막/양극으로 이뤄진 A타입 바이셀(10a)과 음극/분리막/양극/분리막/음극으로 이뤄진 C타입 바이셀(10c)이 적절한 순서로 배치되게 구성된다. 그리고, 폴딩분리막(20)의 끝부분(단위셀이 적층되지 않은 부분)에는 테이프(t)가 접착되어 고정이 이뤄지거나 상기 폴딩분리막(20)의 끝부분이 열압착되어 고정이 이뤄진다.At this time, the laminated electrode assembly is configured such that the unit cells are arranged in an appropriate order, such that the A-type bi-cell (10a) composed of anode/separator/cathode/separator/anode and the C-type bi-cell (10c) composed of cathode/separator/anode/separator/cathode, depending on the position where the cathode and anode are repeatedly laminated in sequence. In addition, a tape (t) is adhered to the end of the folding separator (20) (the portion where the unit cells are not laminated) to secure it, or the end of the folding separator (20) is heat-compressed to secure it.
그러나, 이와 같은 구조는 테이프(t)가 폴딩분리막(20)의 표면에서 돌출되어 상기 폴딩분리막(20)의 외부가 평탄하지 못하게되고 테이프(t)가 제대로 접착되지 못하면 폴딩분리막(20)의 주름 불량 또는 외관불량을 발생시키기도 하였다. 비록, 상기 폴딩분리막(20)은 베이스필름의 양면에 SRS코팅층이 도포되고 상기 SRS코팅층은 세라믹과 접착물질이 함유된 구조를 가졌으나, 상기 접착물질은 세라믹을 베이스필름에 접착시키기 위한 것으로써 일면에서 양극활물질 또는 양극집전체를 폴딩분리막을 고정시킬 수 있을 정도로 큰 접착력을 제공하지는 못하였다. However, such a structure causes the tape (t) to protrude from the surface of the folding separator (20), making the exterior of the folding separator (20) uneven, and if the tape (t) is not properly adhered, it can cause wrinkle defects or appearance defects of the folding separator (20). Although the folding separator (20) has an SRS coating layer applied to both sides of the base film and the SRS coating layer has a structure containing ceramic and an adhesive material, the adhesive material is for adhering the ceramic to the base film, and does not provide an adhesive strength sufficient to fix the positive electrode active material or the positive electrode current collector to the folding separator on one side.
따라서, 본 발명은 폴딩분리막을 더 완전하고 견고히 고정시켜 폴딩분리막의 주름 불량 또는 외관불량 발생을 방지할 수 있는 전극조립체를 제공하는 것에 주목적이 있다.Accordingly, the main purpose of the present invention is to provide an electrode assembly capable of more completely and firmly fixing a folding separator, thereby preventing occurrence of wrinkle defects or appearance defects in the folding separator.
전술한 바와 같은 목적을 달성하기 위한 본 발명은, 단위셀들 복수 개가 폴딩분리막 위에 나란히 놓이면 상기 폴딩분리막의 일측에서부터 타측으로 상기 단위셀들의 적층이 이뤄지도록 폴딩하여 제조되는 전극조립체에 있어서, 최상층 또는 최하층에 적층되도록 가장 마지막에 폴딩되는 단위셀은 폴딩분리막 위에 올려짐으로써 상기 폴딩분리막과 먼저 접하게된 면 또는 그 반대쪽 면 중 어느 한 면에 폴딩분리막과 접착이 이루어지도록 바인더가 도포된 것을 특징으로 한다. 또는, 상기 폴딩분리막과 먼저 접하게된 면과 그 반대쪽 면 모두에 폴딩분리막과 접착이 이루어지도록 바인더가 도포된다. 즉, 최상층 또는 최하층에 적층되도록 가장 마지막에 폴딩되는 단위셀은 상기 폴딩분리막과 접하게되는 상면과 하면 중 어느 한면 또는 두면 모두에 상기 폴딩분리막과 접착이 이루어지도록 바인더가 도포된다.In order to achieve the above-mentioned object, the present invention is characterized in that, in an electrode assembly manufactured by folding a plurality of unit cells so that the unit cells are stacked from one side of the folding separator to the other side when the unit cells are placed side by side on a folding separator, a unit cell which is folded last so as to be stacked as an uppermost or lowermost layer has a binder applied to either one side of the side that first comes into contact with the folding separator or the opposite side thereof so as to adhere to the folding separator. Alternatively, a binder is applied to both the side that first comes into contact with the folding separator and the opposite side thereof so as to adhere to the folding separator. That is, a unit cell which is folded last so as to be stacked as an uppermost or lowermost layer has a binder applied to either one side or both of the upper and lower sides that come into contact with the folding separator so as to adhere to the folding separator.
상기 단위셀은 음극/분리막/양극/분리막/음극 순서로 적층된 C타입 바이셀(중앙에 양극이 위치하는 바이셀)과 양극/분리막/음극/분리막/양극 순서로 적층된 A타입 바이셀(중앙에 음극이 위치하는 바이셀)로 구성되고, 상기 C타입 바이셀과 A타입 바이셀이 복수 개들이 미리 정해진 순서대로 폴딩분리막 위에 놓이게 된다.The above unit cell is composed of a C-type bicell (a bicell with the anode positioned in the center) stacked in the order of cathode/separator/anode/separator/cathode and an A-type bicell (a bicell with the cathode positioned in the center) stacked in the order of anode/separator/cathode/separator/anode, and a plurality of the C-type bicells and A-type bicells are placed on the folding separator in a predetermined order.
가장 마지막에 폴딩되는 단위셀에서 상기 바인더가 도포된 전극은 집전체의 일면에만 활물질이 도포된 단면전극이고, 상기 단면전극에서 활물질이 미도포된 면에 바인더가 도포된다.,In the unit cell that is folded last, the electrode to which the binder is applied is a single-sided electrode in which the active material is applied only to one side of the current collector, and the binder is applied to the side of the single-sided electrode to which the active material is not applied.
상기 단면전극은 양극이고, 상기 양극의 양극집전체는 알루미늄 호일로 제조된다.The above cross-sectional electrode is an anode, and the anode current collector of the anode is made of aluminum foil.
상기 폴딩분리막은 세라믹이 함유된 SRS(safety reinforced separator)코팅층이 베이스필름의 양면에 도포된 구조를 갖되, 상기 SRS코팅층은 접착력을 갖는 접착성분이 함유된다. 상기 폴딩분리막은 본 출원인이 출원하여 등록받은 등록특허 제 10-0775310 호에 개시된 유/무기 복합 다공성 분리막이다. 즉, 베이스필름이 폴리올레핀 계열로 제조되고 상기 베이스필름의 표면 및 상기 베이스필름에 존재하는 기공부 일부로 구성된 군으로부터 선택된 1종 이상의 영역이 무기물 입자 및 바인더 고분자의 혼합물로 코팅된 활성층을 포함하는 유/무기 복합 다공성 분리막으로써, SRS코팅층을 이루는 상기 활성층은 바인더 고분자에 의해 무기물 입자 사이가 연결 및 고정되고, 무기물 입자들 간의 빈 공간(interstitial volume)으로 인해 기공 구조가 형성구조를 갖는다. The above folding separator has a structure in which a safety reinforced separator (SRS) coating layer containing ceramic is applied to both surfaces of a base film, wherein the SRS coating layer contains an adhesive component having adhesive strength. The above folding separator is an organic/inorganic composite porous separator disclosed in Patent No. 10-0775310 applied for and registered by the applicant of the present invention. That is, the base film is made of a polyolefin series, and at least one region selected from the group consisting of a surface of the base film and a part of a pore existing in the base film is an organic/inorganic composite porous separator including an active layer coated with a mixture of inorganic particles and a binder polymer, wherein the active layer forming the SRS coating layer has a pore structure formed by connecting and fixing the inorganic particles by the binder polymer and having an interstitial volume between the inorganic particles.
상기 바인더는 SRS코팅층 보다 더 강한 접착력을 갖도록 제조되며, 비닐리덴 플루오라이드(vinylidene fluoride)를 함유한다.The above binder is manufactured to have stronger adhesion than the SRS coating layer and contains vinylidene fluoride.
본 발명은 위와 같은 특징을 갖는 전극조립체가 파우치 내에 내장된 이차전지를 추가적으로 제공할 수 있다.The present invention can additionally provide a secondary battery having an electrode assembly having the above characteristics built into a pouch.
전술한 바와 같은 구성을 갖는 본 발명은, 가장 마지막에 폴딩되는 단위셀 위로 폴딩분리막이 올려지면 바인더에 의해 추가적인 접착이 이루어져 테이프의 접착력을 보완하거나 대신할 수 있으므로 상기 폴딩분리막의 주름 불량 또는 외관불량 발생을 방지할 수 있다.The present invention having the configuration described above can prevent occurrence of wrinkles or appearance defects in the folding separator by supplementing or replacing the adhesive strength of the tape by additional adhesion through a binder when the folding separator is placed over the unit cell that is folded last.
도 1 은 스택앤폴딩 방식에 따라 폴딩분리막 위에 단위셀들이 올려진 평면도 및 상기 단위셀들의 폴딩이 이뤄진 모습이 나타난 측면도가 도시된 도면.
도 2 는 본 발명의 제1실시예에 따른 전극조립체의 측면도.
도 3 은 본 발명의 제2실시예에 따른 전극조립체의 측면도.
도 4 는 최외각에 배치되지 않는 단위셀의 측면모습(A), 제1실시예에 따라 최외각에 배치되는 단위셀의 측면모습(B), 제2실시예에 따라 최외각에 배치되는 단위셀의 측면모습(C)이 각각 도시된 도면.Figure 1 is a plan view showing unit cells placed on a folding separator according to the stack-and-fold method, and a side view showing the folding of the unit cells.
Figure 2 is a side view of an electrode assembly according to a first embodiment of the present invention.
Figure 3 is a side view of an electrode assembly according to a second embodiment of the present invention.
FIG. 4 is a drawing showing a side view (A) of a unit cell not arranged at the outermost edge, a side view (B) of a unit cell arranged at the outermost edge according to the first embodiment, and a side view (C) of a unit cell arranged at the outermost edge according to the second embodiment, respectively.
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 단위셀들(10c, 10a, 10a', 10a'') 복수 개가 폴딩분리막(20) 위에 나란히 놓이면 상기 폴딩분리막(20)의 일측에서부터 타측으로 상기 단위셀들의 적층이 이뤄지도록 폴딩이 이뤄진(즉, 스택앤폴딩 방식으로 제조되는) 전극조립체에 관한 것으로써, 이하 첨부된 도면들을 참조하여 본 발명에 따른 실시예들을 더욱 상세히 설명한다.The present invention relates to an electrode assembly in which a plurality of unit cells (10c, 10a, 10a', 10a'') are placed side by side on a folding separator (20) and the unit cells are folded from one side of the folding separator (20) to the other side (i.e., manufactured in a stack-and-fold manner). Hereinafter, embodiments according to the present invention will be described in more detail with reference to the attached drawings.
제1실시예First embodiment
본 발명의 제1실시예에 따른 전극조립체의 측면도가 도시된 도 2 를 참조하면, 이 실시예에 따른 전극조립체는 종래의 방식과 같이 길게 펼쳐진 폴딩분리막(20) 위에 단위셀들로써 A타입바이셀(10a, 10a')과 C타입바이셀(10c)이 미리 정해진 순서대로 올려놓은 상태에서 폴딩이 이뤄져 제조된다. Referring to FIG. 2, which illustrates a side view of an electrode assembly according to a first embodiment of the present invention, the electrode assembly according to this embodiment is manufactured by folding unit cells, such as A-type bi-cells (10a, 10a') and C-type bi-cells (10c), placed in a predetermined order on a folding separator (20) that is extended long as in the conventional manner.
즉, 상기 단위셀은 음극/분리막/양극/분리막/음극 순서로 적층된 C타입 바이셀(10c)과 양극/분리막/음극/분리막/양극 순서로 적층된 A타입 바이셀(10a, 10a')로 구성되고, 상기 C타입 바이셀(10c)과 A타입 바이셀(10a, 10a')이 복수 개들이 미리 정해진 순서대로 폴딩분리막(20) 위에 놓이게 된다.That is, the unit cell is composed of a C-type bi-cell (10c) laminated in the order of cathode/separator/anode/separator/cathode and an A-type bi-cell (10a, 10a') laminated in the order of anode/separator/cathode/separator/anode, and a plurality of the C-type bi-cells (10c) and the A-type bi-cells (10a, 10a') are placed on a folding separator (20) in a predetermined order.
이때, 최상층 또는 최하층에 적층되도록 가장 마지막에 폴딩되는 단위셀(10a')(도 2 에서 최상층에 적층되어 폴딩분리막이 마지막에 접하게 되는 단위셀)은 상기 폴딩분리막(20) 끝단과 가까운 위치에 놓이며 상면에서 폴딩분리막(20)과 접착이 이루어지도록 바인더(30)가 도포된다.At this time, the unit cell (10a') that is folded last to be laminated on the top or bottom layer (the unit cell that is laminated on the top layer in FIG. 2 and that comes into contact with the folding separator last) is placed at a position close to the end of the folding separator (20), and a binder (30) is applied on the upper surface so that it is bonded to the folding separator (20).
상기 최상층 단위셀(10a')은 A타입바이셀로써 위에서부터 아래로 양극(11)/분리막(13)/음극(12)/분리막(13)/양극(11) 순서로 적층되되, 최상층 양극(11)은 양극집전체(11a)의 일면에만 양극활물질(11b)이 도포된 단면전극이다. 상기 단면양극은 도면상에서 아랫쪽 면에만 활물질이 도포되되 윗쪽면에는 바인더(30)가 도포된 구조를 갖는다.The uppermost unit cell (10a') is an A-type bi-cell, and is laminated in the order of positive electrode (11)/separator (13)/negative electrode (12)/separator (13)/positive electrode (11) from top to bottom. The uppermost positive electrode (11) is a single-sided electrode in which a positive electrode active material (11b) is applied only to one surface of a positive electrode current collector (11a). The single-sided positive electrode has a structure in which an active material is applied only to the lower surface in the drawing, and a binder (30) is applied to the upper surface.
이때, 상기 단면양극의 양극집전체(11a)는 알루미늄 호일로 제조된다. 그리고, 상기 폴딩분리막(20)은 세라믹이 함유된 SRS(safety reinforced separator)코팅층(22)이 베이스필름(21)의 양면에 도포된 구조를 갖되, 상기 SRS코팅층(22)은 접착력을 갖는 접착성분이 함유된다. At this time, the anode current collector (11a) of the above-mentioned cross-sectional positive electrode is manufactured from aluminum foil. In addition, the above-mentioned folding separator (20) has a structure in which a safety reinforced separator (SRS) coating layer (22) containing ceramic is applied to both sides of a base film (21), and the above-mentioned SRS coating layer (22) contains an adhesive component having adhesive strength.
(상기 폴딩분리막(20)은 본 출원인의 등록특허 제 10-0775310 호에서 소개된 바 있으므로, 해당 내용이 본 명세서에 기재된 것으로 간주하고 상세한 구성 및 성분에 대한 설명은 여기에선 생략하기로 한다).(Since the above folding separator (20) has been introduced in the applicant's registered patent No. 10-0775310, the contents thereof are considered to be described in this specification, and a detailed description of the configuration and components is omitted here.)
본 발명에 따른 바인더(30)는 접착력을 갖고 전극의 성능에 영향을 미치지 않는다면 재질선정에 제한은 없을 것이나, 상기 SRS코팅층(22)과 불필요한 화학반응이 발생하지 않도록 상기 SRS코팅층(22)에 함유된 비닐리덴 플루오라이드(vinylidene fluoride)로 이루어지거나 또는 비닐리덴 플루오라이드를 함유할 수 있다. 그리고, 바인더(30)가 순수 접착제 성분만으로 이루어질 경우 SRS코팅층 보다 더 강한 접착력을 갖도록 제조될 수 있다.The binder (30) according to the present invention has no restrictions on the selection of materials as long as it has adhesive strength and does not affect the performance of the electrode. However, in order to prevent unnecessary chemical reactions with the SRS coating layer (22), it may be made of vinylidene fluoride contained in the SRS coating layer (22) or may contain vinylidene fluoride. In addition, when the binder (30) is made of only pure adhesive components, it can be manufactured to have stronger adhesive strength than the SRS coating layer.
제2실시예Second embodiment
본 발명의 제2실시예에 따른 전극조립체의 측면도가 도시된 도 3 을 참조하면, 이 실시예에서도 위의 제1실시예의 구조와 동일하게 단위셀들(10c, 10a, 10a'') 복수 개가 폴딩분리막(20) 위에 나란히 놓이면 상기 폴딩분리막(20)의 일측에서부터 타측으로 상기 단위셀들(10c, 10a, 10a'')의 적층이 이뤄지도록 폴딩하여 제조이루어지되, 상층 또는 최하층에 적층되도록 가장 마지막에 폴딩되는 단위셀(10a'')(도 3 에서 최상층에 적층되어 폴딩분리막이 마지막에 접하게되는 단위셀)은 상면 및 하면 모두에서 폴딩분리막(20)과 접하는 부분에서 접착이 이루어지도록 각각에 바인더(30)가 도포된다.Referring to FIG. 3 which illustrates a side view of an electrode assembly according to a second embodiment of the present invention, in this embodiment as well, a plurality of unit cells (10c, 10a, 10a'') are placed side by side on a folding separator (20) in the same manner as in the first embodiment above, and the unit cells (10c, 10a, 10a'') are folded so that they are stacked from one side of the folding separator (20) to the other side, and the unit cell (10a'') that is folded last to be stacked on the upper or lower layer (the unit cell that is stacked on the uppermost layer in FIG. 3 and that comes into contact with the folding separator last) is coated with a binder (30) so that adhesion is formed at the portion where it comes into contact with the folding separator (20) on both the upper and lower surfaces.
최외각에 배치되지 않는 단위셀(10a)의 측면모습(A), 제1실시예에 따라 최외각에 배치되는 단위셀(10a')의 측면모습(B), 제2실시예에 따라 최외각에 배치되는 단위셀(10'')의 측면모습(C)이 각각 도시된 도 4 를 참조하면, 세 개는 모두 A타입바이셀의 측면모습들을 각각 나타내되, 최외각(최상부 또는 최하부)에 배치되지 않는 단위셀들(10a)은 최상층과 최하층에 배치된 양극(11)이 양극집전체(11a)의 양면모두에 양극활물질(11b)이 도포된 양면양극이 배치된다. Referring to FIG. 4, which illustrates a side view (A) of a unit cell (10a) that is not arranged at the outermost layer, a side view (B) of a unit cell (10a') arranged at the outermost layer according to the first embodiment, and a side view (C) of a unit cell (10'') arranged at the outermost layer according to the second embodiment, all three represent side views of an A-type bi-cell, but the unit cells (10a) that are not arranged at the outermost layer (uppermost or lowermost) are arranged as double-sided bi-polar electrodes in which a positive electrode active material (11b) is applied to both surfaces of a positive electrode current collector (11a) with the positive electrode (11) arranged at the uppermost and lowermost layers.
반면에, 제1실시예에 따라 최상층에 배치되는 단위셀(10a')은, 도시된 바와 같이 최하층에 배치된 양극(11)이 양면양극이지만, 최상층에는 양극집전체(11a)의 상면에 양극활물질(10b)이 미도포된 대신에 바인더(30)가 도포되는 단면양극이 배치되며, 제2실시예에 따라 최상층에 배치되는 단위셀(10a'')은, 도시된 바와 같이 최하층 및 최하층에 배치된 양극 모두가 단면양극으로 배치된다. On the other hand, in the unit cell (10a') arranged in the uppermost layer according to the first embodiment, as illustrated, the positive electrode (11) arranged in the lowest layer is a double-sided positive electrode, but in the uppermost layer, a single-sided positive electrode is arranged in which a binder (30) is applied instead of a positive electrode active material (10b) not applied to the upper surface of the positive electrode current collector (11a), and in the unit cell (10a'') arranged in the uppermost layer according to the second embodiment, as illustrated, both the positive electrode in the lowest layer and the positive electrode arranged in the lowest layer are arranged as single-sided positive electrodes.
다만, 제2실시예에 따라 최상층에 배치되는 단위셀(10a'')은 바인더(30)가 도포된 면이 폴딩분리막(30)과 맞닿는 방향에 놓이도록 상층에 배치된 단면양극은 상층에 양극활물질(11b)이 미도포되며, 하층에 배치된 단면양극은 하층에 양극활물질(11b)이 미도포된 구조를 갖는다.However, according to the second embodiment, the unit cell (10a'') arranged on the uppermost layer has a structure in which the surface on which the binder (30) is applied is positioned in the direction in which it comes into contact with the folding separator (30), and the cross-sectional positive electrode arranged on the upper layer has a structure in which the positive electrode active material (11b) is not applied on the upper layer, and the cross-sectional positive electrode arranged on the lower layer has a structure in which the positive electrode active material (11b) is not applied on the lower layer.
전술한 바와 같은 구성을 갖는 본 발명은, 가장 마지막에 폴딩되는 단위셀 위(10a', 10a'')로 폴딩분리막(20)이 올려지면 바인더(30)에 의해 접착이 이루어져 (테이프의 접착을 대신하거나 보완할 수 있으므로) 상기 폴딩분리막(20)의 주름 불량 또는 외관불량 발생을 방지할 수 있다. 또한, 본 발명은 위와 같은 특징을 갖는 전극조립체가 파우치 내에 내장된 이차전지를 추가적으로 제공할 수 있다.The present invention having the configuration as described above can prevent occurrence of wrinkle defects or appearance defects of the folding separator (20) by bonding it with a binder (30) when the folding separator (20) is placed on the unit cell (10a', 10a'') that is folded last (since it can replace or supplement the bonding of the tape). In addition, the present invention can additionally provide a secondary battery in which an electrode assembly having the above-described characteristics is embedded in a pouch.
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.
10a, 10a', 10a'' : A타입바이셀로 구성된 단위셀
10c : C타입바이셀로 구성된 단위셀
11 : 양극
12 : 음극
13 : 분리막
20 : 폴딩분리막10a, 10a', 10a'': Unit cell composed of A-type bicelles
10c: Unit cell composed of C-type bicells
11 : Bipolar
12 : Negative
13 : Membrane
20: Folding separator
Claims (10)
최상층 또는 최하층에 적층되도록 가장 마지막에 폴딩되는 단위셀은 상기 폴딩분리막과 접하게되는 상면과 하면 두 면 모두에 상기 폴딩분리막과 접착이 이루어지도록 바인더가 도포되며,
가장 마지막에 폴딩되는 단위셀에서 최상층 및 최하층에 배치되는 전극은 집전체의 일면에만 활물질이 도포된 단면전극이고, 최상층에 배치되는 전극은 활물질이 미도포된 상면에 바인더가 도포되며 최하층에 배치되는 전극은 활물질이 미도포된 하면에 바인더가 도포되고,
상기 폴딩분리막은 세라믹이 함유된 SRS코팅층이 베이스필름의 양면에 도포된 구조를 가지며 상기 SRS코팅층은 비닐리덴 플루오라이드(vinylidene fluoride)를 함유하고,
상기 바인더는 비닐리덴 플루오라이드를 함유하는 것을 특징으로 하는 전극조립체.
In an electrode assembly manufactured by folding a plurality of unit cells so that they are placed side by side on a folding separator, the unit cells are stacked from one side of the folding separator to the other side,
The unit cell that is folded last to be stacked on the uppermost or lowermost layer has a binder applied to both the upper and lower surfaces that come into contact with the folding separator so that it adheres to the folding separator.
In the unit cell that is folded last, the electrodes placed in the uppermost and lowermost layers are single-sided electrodes in which the active material is applied only to one side of the current collector, the electrode placed in the uppermost layer has the binder applied to the upper surface where the active material is not applied, and the electrode placed in the lowermost layer has the binder applied to the lower surface where the active material is not applied.
The above folding separator has a structure in which an SRS coating layer containing ceramic is applied to both sides of a base film, and the SRS coating layer contains vinylidene fluoride.
An electrode assembly characterized in that the above binder contains vinylidene fluoride.
상기 단위셀은 음극/분리막/양극/분리막/음극 순서로 적층된 C타입 바이셀과 양극/분리막/음극/분리막/양극 순서로 적층된 A타입 바이셀로 구성되고, 상기 C타입 바이셀과 A타입 바이셀이 미리 정해진 순서대로 폴딩분리막 위에 놓이는 것을 특징으로 하는 전극조립체.
In paragraph 1,
The above unit cell is composed of a C-type bi-cell stacked in the order of cathode/separator/anode/separator/cathode and an A-type bi-cell stacked in the order of anode/separator/cathode/separator/anode, and an electrode assembly characterized in that the C-type bi-cell and the A-type bi-cell are placed on a folding separator in a predetermined order.
상기 단면전극은 양극인 것을 특징으로 하는 전극조립체.
In paragraph 1,
An electrode assembly characterized in that the above cross-sectional electrode is an anode.
상기 양극의 양극집전체는 알루미늄 호일로 제조된 것을 특징으로 하는 전극조립체.
In Article 4,
An electrode assembly characterized in that the positive electrode current collector of the above positive electrode is made of aluminum foil.
상기 SRS코팅층은 접착력을 갖는 접착성분이 함유된 것을 특징으로 하는 전극조립체.
In paragraph 1,
An electrode assembly characterized in that the above SRS coating layer contains an adhesive component having adhesive strength.
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