KR20210032149A - manufacturing method of electrode assembly - Google Patents

manufacturing method of electrode assembly Download PDF

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KR20210032149A
KR20210032149A KR1020190113551A KR20190113551A KR20210032149A KR 20210032149 A KR20210032149 A KR 20210032149A KR 1020190113551 A KR1020190113551 A KR 1020190113551A KR 20190113551 A KR20190113551 A KR 20190113551A KR 20210032149 A KR20210032149 A KR 20210032149A
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electrode
cell
cells
separator
prepared
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이보라
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이보라
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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
    • 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
    • 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

Abstract

The present invention relates to a method for manufacturing an electrode assembly, which comprises the following steps: preparing at least two bi-cells formed in the order of a separator/negative electrode cell/separator/positive electrode cell/separator/negative electrode cell/separator; preparing at least one electrode cell; and alternately stacking the bi-cells and the electrode cell so that any one of the prepared electrode cells is positioned between the prepared bi-cells. According to the present invention, a method of alternatively stacking the bi-cells and the electrode cells is applied so that a defective electrode is removed in a corresponding preparation process, thereby significantly reducing the frequency of rework and ultimately reducing the defect rate of the electrode assembly.

Description

전극 조립체의 제조방법{manufacturing method of electrode assembly}Manufacturing method of electrode assembly {manufacturing method of electrode assembly}

본 발명은 전극 조립체의 조립방법에 관한 것으로, 더욱 상세하게는, 바이셀과 전극셀이 교차 적층되는 전극 조립체의 제조방법에 관한 것이다.The present invention relates to a method of assembling an electrode assembly, and more particularly, to a method of manufacturing an electrode assembly in which a bi-cell and an electrode cell are cross-stacked.

재충전이 가능한 이차 전지는 모바일 기기의 에너지원으로 광범위하게 사용되고 있다. 또한, 이차 전지는 내연 기관의 배출가스 문제 및 화석연료 고갈 문제를 해결하기 위한 방안으로 제시되고 있는 전기자동차 등의 에너지 저장 수단으로 사용되고 있다.Rechargeable rechargeable batteries are widely used as energy sources for mobile devices. In addition, secondary batteries are being used as energy storage means for electric vehicles, which have been proposed as a solution to the exhaust gas problem of internal combustion engines and fossil fuel depletion problems.

이차 전지는 외부 및 내부의 구조적 특징에 따라 원통형 전지, 각형 전지 및 파우치형 전지로 분류된다. Secondary batteries are classified into cylindrical batteries, prismatic batteries, and pouch-type batteries according to external and internal structural features.

이차 전지를 구성하는 양극/분리막/음극 구조의 전극 조립체는 그 구조에 따라 크게 젤리-롤형(권취형)과 스택형(적층형)으로 구분된다. 젤리-롤형 전극조립체는, 집전체로 사용되는 금속 호일에 전극 활물질 등을 코팅하고 건조 및 프레싱한 후, 소망하는 폭과 길이의 밴드 형태로 재단하고 분리막을 사용하여 음극과 양극을 격막한 후 나선형으로 감아 제조된다.Electrode assemblies having a positive electrode/separator/cathode structure constituting a secondary battery are largely classified into a jelly-roll type (winding type) and a stack type (stack type) according to their structure. The jelly-roll type electrode assembly is coated with an electrode active material, etc. on a metal foil used as a current collector, dried and pressed, cut into a band of desired width and length, and separated from the negative electrode and the positive electrode using a separator, It is manufactured by winding it with.

이러한 젤리-롤형 전극조립체는 원통형 전지에는 바람직하게 사용될 수 있지만, 각형 또는 파우치형 전지에 적용함에 있어서는, 국부적으로 응력이 집중되어 전극 활물질이 박리되거나 충방전 과정에서 반복되는 수축 및 팽창 현상에 의해 전지의 변형을 유발한다.These jelly-roll type electrode assemblies can be preferably used for cylindrical batteries, but when applied to prismatic or pouch-type batteries, local stress is concentrated and the electrode active material is peeled off, or due to repetitive contraction and expansion during the charging and discharging process, the battery Cause the deformation of.

반면에, 스택형 전극 조립체는 다수의 양극 및 음극 단위셀들을 순차적으로 적층한 구조로서, 각형의 형태를 얻기가 용이한 장점이 있지만, 제조 과정이 번잡하고 충격이 가해졌을 때 전극이 밀려서 단락이 유발되는 단점이 있다.On the other hand, the stacked electrode assembly is a structure in which a plurality of positive and negative unit cells are sequentially stacked, and has the advantage of being easy to obtain a square shape, but the manufacturing process is complicated and the electrode is pushed when an impact is applied, causing a short circuit. There is a drawback that is caused.

이러한 문제점을 해결하기 위하여, 종래 일부 선행 기술에서는 젤리-롤형과 스택형의 혼합 형태인 전극 조립체로서, 일정한 단위 크기의 양극/분리막/음극 구조의 풀셀(full cell) 또는 양극(음극)/분리막/음극(양극)/분리막/양극(음극) 구조의 바이셀(bicell)을 긴 길이의 연속적인 분리 필름을 이용하여 폴딩한 구조의 스택/폴딩형 전극 조립체가 개발되었다.In order to solve this problem, in some prior art, in the prior art, as an electrode assembly in a mixed form of a jelly-roll type and a stack type, a positive electrode/separator/cathode structure full cell or a positive electrode (cathode)/separator/ A stack/folding electrode assembly having a structure in which a bicell having a cathode (anode)/separator/anode (cathode) structure is folded using a long continuous separation film has been developed.

그러나 긴 시트형의 분리막에 단위셀들을 일일이 배열해야 하고, 양단에서 단위셀 및 분리막을 잡고 폴딩해야 하는 등 제조 공정을 위한 내부 공간 내지 시스템이 필수적으로 요구되고 그 공정 과정이 매우 복잡하며, 결과적으로 설비 투자 비용이 높은 단점이 있다. 더욱이, 단위셀들이 증가할 수록, 단위셀들이 일렬로 배열되어 권취되기 어려우므로, 전극 조립체의 불량률이 높아질 수 있다.However, the unit cells must be individually arranged in a long sheet-shaped separator, and the internal space or system for the manufacturing process is required, such as to hold and fold the unit cells and the separator at both ends, and the process process is very complex. As a result, equipment There is a drawback of high investment cost. Moreover, as the number of unit cells increases, the unit cells are arranged in a row and it is difficult to be wound, so that the defective rate of the electrode assembly may increase.

대한민국 등록특허공보 제10-1837724호(2018.03.06.)Republic of Korea Patent Publication No. 10-1837724 (2018.03.06.)

이에 상기와 같은 점을 감안해 발명된 본 발명의 목적은, 전극셀들이 적층된 전지셀 적층체에서, 열융착공정에 의해 제조된 하나의 바이셀을 적층하고, 각 바이셀들 사이에 단위 전극셀을 적층하고 이를 다시 열융착공정을 통하여 하나의 전극조립체를 이루게 함으로서 제조 공정을 간소화하고 전극의 불량으로 인한 재작업을 최소화할 수 있으며 초기 투자 비용을 최소화할 수 있는 전극 조립체의 제조방법을 제공하는 것이다.Accordingly, the object of the present invention, in consideration of the above points, is, in a battery cell stack in which electrode cells are stacked, one bi-cell manufactured by a thermal fusion process is stacked, and a unit electrode cell between each bi-cell It provides a method of manufacturing an electrode assembly that simplifies the manufacturing process, minimizes rework due to defective electrodes, and minimizes initial investment cost by stacking them and forming one electrode assembly through the thermal fusion process again. will be.

위와 같은 본 발명의 일실시예의 전극 조립체의 제조방법은, 분리막/음극셀/분리막/양극셀/분리막/음극셀/분리막 순서로 형성된 바이셀이 2개 이상 준비되는 단계와, 양극의 전극셀이 1개 이상 준비되는 단계와, 준비된 바이셀들 사이에 준비된 전극셀들 중 어느 하나가 위치되도록 바이셀과 전극셀이 교차 적층되는 단계를 포함한다.The method of manufacturing an electrode assembly according to an embodiment of the present invention as described above includes the steps of preparing two or more bi-cells formed in the order of a separator/cathode cell/separator/anode cell/separator/cathode cell/separator, and the electrode cell of the anode is The step of preparing one or more, and a step of cross-stacking the bi-cell and the electrode cell so that any one of the prepared electrode cells is positioned between the prepared bi-cells.

위와 같은 본 발명의 일실시예의 전극 조립체의 제조방법은, 분리막/양극셀/분리막/음극셀/분리막/양극셀/분리막 순서로 형성된 바이셀이 2개 이상 준비되는 단계와, 음극의 전극셀이 1개 이상 준비되는 단계와, 준비된 바이셀들 사이에 준비된 전극셀들 중 어느 하나가 위치되도록 바이셀과 전극셀이 교차 적층되는 단계를 포함한다.The method of manufacturing an electrode assembly according to an embodiment of the present invention as described above includes the steps of preparing two or more bi-cells formed in the order of a separator/anode cell/separator/cathode cell/separator/anode cell/separator, and the electrode cell of the negative electrode. The step of preparing one or more, and a step of cross-stacking the bi-cell and the electrode cell so that any one of the prepared electrode cells is positioned between the prepared bi-cells.

또한, 전극셀이 1개 이상 준비되는 단계에서, 전극셀은, 준비된 바이셀의 갯수보다 1개 적게 준비될 수 있다.In addition, in the step of preparing one or more electrode cells, one electrode cell may be prepared less than the number of prepared bi-cells.

또한, 적층된 바이셀과 전극셀은 테이프 또는 열융착으로 고정될 수 있다.In addition, the stacked bi-cell and electrode cell may be fixed by tape or thermal fusion.

또한, 적층된 바이셀과 전극셀은 테이프 또는 열융착으로 고정된 후, 필름으로 감싸지고, 필름의 끝단부는 테이프 또는 열융착으로 고정될 수 있다.In addition, the stacked bi-cell and electrode cell may be fixed by tape or thermal fusion, and then wrapped with a film, and the end of the film may be fixed by tape or thermal fusion.

위와 같이 구성되는 본 발명의 일실시예의 전극 조립체의 제조방법에 따르면, 바이셀과 전극셀을 교체 적재하는 방식을 택함으로서, 바이셀과 전극셀을 준비하는 과정이 비교적 간단하고 전극 불량품을 해당 준비 과정에서 사전 제거함으로 재작업의 빈도를 현저히 줄일 수 있다.According to the method of manufacturing an electrode assembly according to an embodiment of the present invention configured as described above, the process of preparing the bi-cell and the electrode cell is relatively simple by selecting the method of replacing and loading the bi-cell and the electrode cell, and the corresponding preparation of the defective electrode. By removing them in advance in the process, the frequency of rework can be significantly reduced.

도 1은 본 발명의 일실시예의 전극 조립체의 제조방법을 보여주는 절차도이다.
도 2 내지 도 3은 도 1의 절차도에 따라 준비된 바이셀 및 전극셀을 보여주는 예시도이다.1 is a flowchart showing a method of manufacturing an electrode assembly according to an embodiment of the present invention.
2 to 3 are exemplary views showing bicells and electrode cells prepared according to the procedure diagram of FIG. 1.

이하 첨부된 도면을 참조로 본 발명의 일실시예의 전극 조립체의 제조방법을 설명한다.Hereinafter, a method of manufacturing an electrode assembly according to an embodiment of the present invention will be described with reference to the accompanying drawings.

도 1에 도시된 바와 같이, 본 발명의 일실시예의 전극 조립체의 제조방법은, 바이셀(100)이 2개 이상 준비되는 단계(S100)와, 전극셀(200)이 1개 이상 준비되는 단계(S200)와, 준비된 바이셀(100)들 사이에 준비된 전극셀(200)들 중 어느 하나가 위치되도록 바이셀(100)과 전극셀(200)이 교차 적층되는 단계(S300)를 포함한다.As shown in FIG. 1, the method of manufacturing an electrode assembly according to an embodiment of the present invention includes a step in which two or more bi-cells 100 are prepared (S100), and one or more electrode cells 200 are prepared. (S200) and a step (S300) of cross-stacking the bi-cell 100 and the electrode cell 200 so that any one of the prepared electrode cells 200 is positioned between the prepared bi-cells 100.

일예에 따르면, 도 2에 도시된 바와 같이, 바이셀(100)은 분리막(110)/음극셀(120)/양극셀(130)/분리막(110)/음극셀(120)/분리막(110) 순서로 형성된다. 바이셀(100)을 형성하는 음극셀(120)은 음극의 극성을 가진 전극체로써 음극 집전체의 양면에 음극 물질이 코팅되고, 바이셀(100)을 형성하는 양극셀(130)은 양극의 극성을 가진 전극체로서 양극 집전체의 양면에 양극 물질이 코팅된다. 분리막(110), 음극셀(120), 양극셀(130)은 단계별 열융착을 통하여 하나의 바이셀(100)을 구성한다. 전극셀(200)은 양극의 극성을 가진 전극체로서 양극 집전체의 양면에 양극 물질이 코팅된 전기화학소자로 구성된다. According to one example, as shown in Figure 2, the bi-cell 100 is a separator 110 / cathode cell 120 / anode cell 130 / separator 110 / cathode cell 120 / separator 110 Are formed in order. The negative electrode cell 120 forming the bi-cell 100 is an electrode body having a negative polarity, and a negative electrode material is coated on both surfaces of the negative electrode current collector, and the positive cell 130 forming the bi-cell 100 is formed of the positive electrode. As an electrode body having polarity, a positive electrode material is coated on both sides of the positive electrode current collector. The separator 110, the cathode cell 120, and the anode cell 130 constitute one bi-cell 100 through step-by-step thermal fusion. The electrode cell 200 is an electrode body having a polarity of a positive electrode and is composed of an electrochemical device in which a positive electrode material is coated on both surfaces of a positive electrode current collector.

전극셀(200)이 1개 이상 준비되는 단계(S200)에서, 전극셀(200)은, 준비된 바이셀(100)의 갯수보다 1개 적게 준비된다. 바이셀(100)을 2개 이상 준비하는 단계(S100), 전극셀(200)이 1개 이상 준비되는 단계(S200)에서는, 바이셀(100) 또는 전극셀(200)의 하자를 검증한다. 바이셀(100) 또는 전극셀(200)의 하자가 검증되므로, 완성된 전극 조립체의 불량률을 감소시킬 수 있다.In the step (S200) in which one or more electrode cells 200 are prepared, one electrode cell 200 is prepared less than the number of prepared bicells 100. In the step of preparing two or more bi-cells 100 (S100) and preparing one or more electrode cells 200 (S200), defects of the bi-cell 100 or the electrode cell 200 are verified. Since the defect of the bi-cell 100 or the electrode cell 200 is verified, the defective rate of the completed electrode assembly can be reduced.

바이셀(100)과 전극셀(200)이 교차 적층되는 단계(S300) 후에, 적층된 바이셀(100)과 전극셀(200)은 테이프 또는 열융착으로 고정된다. 적층된 바이셀(100)과 전극셀(200)은 테이프 또는 열융착으로 고정된 후, 필름으로 감싸지고, 필름의 끝단부는 테이프 또는 열융착으로 고정된다.After the step (S300) of cross-stacking the bi-cell 100 and the electrode cell 200, the stacked bi-cell 100 and the electrode cell 200 are fixed by tape or thermal fusion. The laminated bi-cell 100 and the electrode cell 200 are fixed by tape or thermal fusion, and then wrapped with a film, and the end of the film is fixed by tape or thermal fusion.

다른 일예에 따르면, 도 3에 도시된 바와 같이, 바이셀(100)은, 분리막(110)/양극셀(130)/분리막(110)/음극셀(120)/분리막(110)/양극셀(130)/분리막(110) 순서로 형성된다. 전극셀(200)은 음극의 극성을 가진 전극체로서 음극 집전체의 양면에 음극 물질이 코팅된 전기화학소자로 구성된다. According to another example, as shown in FIG. 3, the bi-cell 100 includes a separator 110 / an anode cell 130 / a separator 110 / a cathode cell 120 / a separator 110 / an anode cell ( 130) / separator 110 is formed in the order. The electrode cell 200 is an electrode body having a polarity of a negative electrode and is composed of an electrochemical device in which a negative electrode material is coated on both sides of a negative electrode current collector.

위와 같이 구성되는 본 발명의 일실시예의 전극 조립체의 제조방법에 따르면, 바이셀(100)과 전극셀(200)을 교체 적재하는 방식을 택함으로서, 전극 불량품을 해당 준비 과정에서 사전 제거함으로써 재작업의 빈도를 현저히 줄일 수 있으며, 궁극적으로 전극 조립체의 불량률을 감소시킬 수 있다.According to the method of manufacturing an electrode assembly according to an embodiment of the present invention configured as described above, by selecting a method of replacing and loading the bi-cell 100 and the electrode cell 200, rework by removing defective electrode products in advance in the corresponding preparation process. The frequency of can be significantly reduced, and ultimately, the defective rate of the electrode assembly can be reduced.

특히, 바이셀(100) 양단에 분리막(110)이 위치되며, 바이셀(100) 사이에 전극셀(200)이 위치되도록 전극 조립체가 형성되므로, 전극 조립체 형성 후, 음극셀(120), 양극셀(130) 및 전극셀(200)이 외부에 노출되지 않게 된다. 따라서 전극 조립체의 양단에 위치된 음극셀(120) 또는 양극셀(130) 보호를 위해 보호필름을 추가적으로 장착할 필요가 없게 된다.In particular, since the electrode assembly is formed so that the separator 110 is positioned at both ends of the bi-cell 100 and the electrode cell 200 is positioned between the bi-cell 100, after forming the electrode assembly, the cathode cell 120, the anode The cell 130 and the electrode cell 200 are not exposed to the outside. Therefore, there is no need to additionally mount a protective film to protect the cathode cell 120 or the anode cell 130 located at both ends of the electrode assembly.

또한, 완성된 전체셀의 최소단위는 /-/+/-/+/-/+/-/이거나, /+/-/+/-/+/-/+/로서 전극셀 기준으로 7개이다. 즉, 3개의 전극셀로 이루어진 /-/+/-/ 또는 /+/-/+/의 단위셀 2개와 1개의 전극셀로 만들어, 최소단위의 전극셀로 제작이 가능하다. 여기서, /는 분리막이며, +, -는 전극셀을 의미한다.In addition, the minimum unit of all completed cells is /-/+/-/+/-/+/-/ or /+/-/+/-/+/-/+/, which is 7 based on electrode cells. In other words, it is possible to manufacture as a smallest unit electrode cell by making two unit cells of /-/+/-/ or /+/-/+/ consisting of three electrode cells and one electrode cell. Here, / denotes a separator, and + and-denotes an electrode cell.

100: 바이셀 110: 분리막
120: 음극셀 130: 양극셀
200: 전극셀100: bicell 110: separator
120: negative cell 130: positive cell
200: electrode cell

Claims (5)

분리막/음극셀/분리막/양극셀/분리막/음극셀/분리막 순서로 형성된 바이셀이 2개 이상 준비되는 단계;
양극의 전극셀이 1개 이상 준비되는 단계;
준비된 상기 바이셀들 사이에 준비된 상기 전극셀들 중 어느 하나가 위치되도록 상기 바이셀과 상기 전극셀이 교차 적층되는 단계를 포함하는 전극 조립체의 제조방법.
Preparing two or more bi-cells formed in the order of a separator/cathode cell/separator/anode cell/separator/cathode cell/separator;
Preparing one or more positive electrode cells;
A method of manufacturing an electrode assembly comprising the step of cross-stacking the bi-cell and the electrode cell so that any one of the prepared electrode cells is positioned between the prepared bi-cells.
 분리막/양극셀/분리막/음극셀/분리막/양극셀/분리막 순서로 형성된 바이셀이 2개 이상 준비되는 단계;
음극의 전극셀이 1개 이상 준비되는 단계;
준비된 상기 바이셀들 사이에 준비된 상기 전극셀들 중 어느 하나가 위치되도록 상기 바이셀과 상기 전극셀이 교차 적층되는 단계를 포함하는 전극 조립체의 제조방법.
Preparing two or more bi-cells formed in the order of a separator/anode cell/separator/cathode cell/separator/anode cell/separator;
Preparing one or more electrode cells of the negative electrode;
A method of manufacturing an electrode assembly comprising the step of cross-stacking the bi-cell and the electrode cell so that any one of the prepared electrode cells is positioned between the prepared bi-cells.
 제1항 또는 제2항에 있어서,
상기 전극셀이 1개 이상 준비되는 단계에서,
상기 전극셀은, 준비된 상기 바이셀의 갯수보다 1개 적게 준비되는 전극 조립체의 제조방법.
The method according to claim 1 or 2,
In the step of preparing one or more electrode cells,
The method of manufacturing an electrode assembly in which one electrode cell is prepared less than the number of prepared bi-cells.
 제1항 또는 제2항에 있어서,
적층된 상기 바이셀과 상기 전극셀은 테이프 또는 열융착으로 고정되는 전극 조립체의 제조방법.
The method according to claim 1 or 2,
The method of manufacturing an electrode assembly in which the stacked bi-cell and the electrode cell are fixed by tape or thermal fusion.
 제4항에 있어서,
적층된 상기 바이셀과 상기 전극셀은 테이프 또는 열융착으로 고정된 후, 필름으로 감싸지고,
상기 필름의 끝단부는 테이프 또는 열융착으로 고정되는 전극 조립체의 제조방법.The method of claim 4,
The laminated bi-cell and the electrode cell are fixed by tape or thermal fusion, and then wrapped with a film,
A method of manufacturing an electrode assembly in which the end of the film is fixed by means of tape or thermal fusion.
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