KR100513645B1 - The laminated cell with the outmost electrode pocketed by two separators - Google Patents

The laminated cell with the outmost electrode pocketed by two separators Download PDF

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KR100513645B1
KR100513645B1 KR10-2003-0017574A KR20030017574A KR100513645B1 KR 100513645 B1 KR100513645 B1 KR 100513645B1 KR 20030017574 A KR20030017574 A KR 20030017574A KR 100513645 B1 KR100513645 B1 KR 100513645B1
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South Korea
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electrode
outermost
separator
separators
battery
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KR10-2003-0017574A
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Korean (ko)
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KR20040082874A (en
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현오영
조진연
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주식회사 엘지화학
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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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
    • 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
    • H01M10/052—Li-accumulators
    • 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
    • H01M50/403—Manufacturing processes of separators, membranes or diaphragms
    • 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
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • 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

본 발명은 최외곽의 전극과 맞닿아 있는 분리막에 의해 최외곽 전극이 포켓팅된 적층형 전지를 제공한다.The present invention provides a stacked battery in which the outermost electrode is pocketed by a separator in contact with the outermost electrode.

본 발명은 적층 구조의 전지에서 발생할 수 있는 양극과 음극 간의 쇼트를 방지할 수 있다.The present invention can prevent a short between the positive electrode and the negative electrode which may occur in a battery having a laminated structure.

Description

최외곽 전극이 분리막에 의해 포켓팅된 적층형 전지{THE LAMINATED CELL WITH THE OUTMOST ELECTRODE POCKETED BY TWO SEPARATORS} Stacked battery with outermost electrode pocketed by separator {THE LAMINATED CELL WITH THE OUTMOST ELECTRODE POCKETED BY TWO SEPARATORS}

본 발명은 최외곽의 전극과 맞닿아 있는 분리막에 의해 최외곽 전극이 포켓팅된 적층형 전지에 관한 것이다.The present invention relates to a stacked battery in which the outermost electrode is pocketed by a separator in contact with the outermost electrode.

일반적으로, 전지는 양극, 음극 및 그 사이에 위치하는 분리막으로 구성된다.In general, a battery is composed of a positive electrode, a negative electrode and a separator positioned therebetween.

한편, 적층 방식의 전지는 1개 이상의 양극 극판을 연결하고 이를 전지 외부로 연결해 주는 양극 리드와, 1개 이상의 음극 극판을 연결하고 전지 외부로 연결해 주는 음극 리드가 전지 포장재 외부의 전원과 연결되는 구조로 되어 있다. 대부분의 전지 설계에서, 상반되는 리드들은 서로 접촉하지 않도록 서로 옵셋(off-set)되어 있다.On the other hand, the laminated battery has a structure in which a positive electrode lead connecting one or more positive electrode plates and connecting them to the outside of the battery and a negative electrode lead connecting one or more negative electrode plates and connecting them to the outside of the battery are connected to a power source outside the battery packaging material. It is. In most cell designs, the opposing leads are offset from one another so that they do not touch each other.

그러나, 제조 공정 진행 중 또는 제품 사용 시 적층 구조의 전지의 최외곽 전극이 음극일 때 최외곽 음극과 양극 리드와의 물리적 접촉으로 인해 쇼트가 발생할 수 있다. 마찬가지로, 제조 공정 진행 중 또는 제품 사용 시 적층 구조의 전지의 최외곽 전극이 양극일 때 최외곽 양극과 음극 리드와의 물리적 접촉으로 인해 쇼트가 발생할 수 있다. 이러한 쇼트에 의한 전지 불량 발생율은 약 10% 전후로 나타난다.However, when the outermost electrode of the battery having the laminated structure is the negative electrode during the manufacturing process or the product is used, a short may occur due to the physical contact between the outermost negative electrode and the positive electrode lead. Similarly, when the outermost electrode of the battery having the laminated structure is the positive electrode during the manufacturing process or during the use of the product, short may occur due to physical contact between the outermost positive electrode and the negative electrode lead. The occurrence rate of battery defects due to such a short is about 10%.

따라서, 본 발명의 목적은 적층 구조의 전지에서 공정 중 또는 제품 사용 시 발생할 수 있는 최외곽 전극과 반대 전극 리드 간의 쇼트를 방지하는 것이다. Accordingly, an object of the present invention is to prevent a short between the outermost electrode and the opposite electrode lead, which may occur during processing or during product use in a battery having a laminated structure.

상기 목적을 달성하기 위해, 본 발명은 1개 이상의 양극 층; 상기 양극 층과 교번하여 적층된 1개 이상의 음극 층; 및 상기 양극 층과 음극 층 사이 및 최외곽 전극 층의 표면에 각각 적층된 분리막 층을 포함하는 전지에 있어서, 최외곽 전극의 상하에 각각 적층된 2개의 분리막에 의해 최외곽 전극이 일부 또는 전부 포켓팅됨으로써 최외곽 전극과 반대 전극 리드가 분리막에 의해 분리된 전지를 제공한다.In order to achieve the above object, the present invention provides at least one anode layer; At least one cathode layer laminated alternately with the anode layer; And a separator layer laminated between the anode layer and the cathode layer and on the surface of the outermost electrode layer, wherein the outermost electrode pockets some or all of the outermost electrode by two separators stacked on top and bottom of the outermost electrode, respectively. The outermost electrode and the opposite electrode lead are separated by a separator to provide a battery.

이하에서는 본 발명을 상세하게 설명한다.Hereinafter, the present invention will be described in detail.

적층형 전지는 양극과 음극을 순차적으로 적층하고 각 전극 사이에 분리막을 삽입하여 제조한다. 이 때 분리막이 최외곽에 오도록 하고, 적층된 전극의 집전체를 초음파로 용착(welding)하여 일체화시킨 후 각 전극에 서로 다른 리드를 연결한다.Stacked batteries are manufactured by sequentially stacking a positive electrode and a negative electrode and inserting a separator between each electrode. At this time, the separator is placed on the outermost side, and the current collectors of the stacked electrodes are welded with ultrasonic waves to be integrated, and then different leads are connected to each electrode.

이때 모든 전극 사이에는 분리막(13)이 존재하여 다른 전극 간의 접촉을 억제하여 쇼트를 물리적으로 방지한다. At this time, the separator 13 is present between all the electrodes to physically prevent the short by inhibiting contact between the other electrodes.

또, 도 1에 나타난 바와 같이 모든 전극 간에는 분리막이 전극 보다 큰 크기로 존재하고, 초음파 용착 후 V형태로 꺾을 때 전극 상단부의 남은 분리막 부분이 리드가 꺾이는 방향으로 따라서 접히게 되므로, 최외곽 전극에 맞닿아 있는 분리막(도1의 13)을 제외한 모든 분리막은 방향성을 가지며 접히게 되어, 전극과 리드 사이에도 분리막이 존재하여 반대 전극과 리드 간의 접촉을 억제하여 쇼트를 물리적으로 방지한다. In addition, as shown in FIG. 1, the separator exists between the electrodes in a larger size than the electrodes, and when the electrode is folded in the V shape after the ultrasonic welding, the remaining separator part of the electrode is folded along the direction in which the lead is folded. All the separators except the contacting membrane (13 in FIG. 1) are oriented and folded, so that a separator exists between the electrode and the lead to suppress contact between the opposite electrode and the lead to physically prevent the short.

그러나, 전지 제조 시 최외곽 전극의 상하면에 각각 위치한 2개의 분리막은 접히는 방향이 일정하지 않고, 따라서 최외곽 전극이 반대극 리드와 분리막에 의해 격리되어 있지 않는 경우가 발생한다. However, two separators positioned on the upper and lower surfaces of the outermost electrode are not uniformly folded in battery manufacturing, and thus the outermost electrode may not be separated by the opposite electrode lead and the separator.

따라서, 용착이 완성된 전지를 알루미늄 포장재에 삽입시킬 경우 공간 확보를 위하여 용착된 부위를 V-형태로 꺾어 넣게 될 때, 최외곽에 위치한 전극과 반대 전극의 리드 간에 쇼트가 발생할 수 있다. Therefore, when the welded battery is inserted into the aluminum packaging, when the welded portion is folded in the V-shape to secure space, a short may occur between the lead of the electrode located at the outermost side and the opposite electrode.

또, 도 1에 나타낸 바와 같이 최외곽에 존재하는 전극(11)의 높이가 반대 전극 리드(12)의 높이와 동일한 경우, 전지 제조 과정 중 또는 제품 상태에서 발생할 수 있는 진동 등의 외란(外亂)에 의해 최외곽 전극(11)은 반대 전극의 리드(12)의 꺾인 부위와 물리적으로 맞닿을 수 있으며, 이로 인해 양극과 음극 간의 쇼트가 발생할 수 있다.In addition, as shown in FIG. 1, when the height of the outermost electrode 11 is the same as the height of the opposite electrode lead 12, disturbances such as vibrations that may occur during battery manufacturing or in a product state may occur. The outermost electrode 11 may be in physical contact with the bent portion of the lead 12 of the opposite electrode, which may cause a short between the anode and the cathode.

따라서, 본 발명은 도 1에 나타낸 바와 같이, 최외곽 전극의 상하면에 각각 위치한 2개의 분리막 전체 혹은 일부를 열 압착 또는 테이핑으로 일체화시켜 최외곽 전극 일부 또는 전부를 분리막(13)으로 포켓팅함으로써, 최외곽 전극과 반대편 전극의 리드 간에 발생할 수 있는 쇼트를 원천적으로 봉쇄하는 것을 특징으로 한다.Accordingly, the present invention, as shown in Figure 1, by integrating all or part of the two separation membranes respectively located on the upper and lower surfaces of the outermost electrode by thermal compression or taping to pocket part or all of the outermost electrode with the separator 13, It is characterized in that the short blocking may occur between the outermost electrode and the lead of the opposite electrode.

최외곽 전극을 분리막으로 포켓팅하는 방법으로 최외곽 전극의 상하에 각각 적층된 2개의 분리막을 리드 방향쪽 모서리 전부 또는 일부 압착시키는 방법이 있다. 상기 압착은 열 압착일 수 있다. 열 압착 조건은 분리막 재료와 전극 두께에 의해 변경될 수 있다. 일례로 열 압착 조건은 150도 4초 정도이며, 압력은 큰 영향이 없다. 열 압착 조건은 분리막 재료와 전지 설계 구조에 따라 얼마든지 변경할 수 있으며, 특별한 경향성은 없다.As a method of pocketing the outermost electrode as a separator, there is a method in which two or more separators stacked on the upper and lower sides of the outermost electrode are crimped to all or part of the edges in the lead direction. The compression may be thermal compression. Thermal compression conditions can be altered by membrane material and electrode thickness. For example, the thermal compression conditions are about 150 degrees 4 seconds, the pressure is not large. The thermal compression conditions can be changed as much as the membrane material and the cell design structure, and there is no particular tendency.

열 압착이 가능하지 않은 분리막의 경우는 테이프를 이용하여 포켓팅할 수 있다. 이 때 사용되는 테이프는 전해액과 반응이 없다면 모든 종류가 사용 가능하다.In the case of a membrane that is not thermally compressible, pocketing may be performed using a tape. At this time, all kinds of tapes can be used if there is no reaction with electrolyte.

최외각 전극이 반대 전극의 리드과 물리적으로 맞닿지 않도록 최외각 전극을 포켓팅하기 위한 분리막의 압착 폭 또는 테이핑 폭은 전지 설계에 따라 달라지지만 대체로 최외곽 전극 크기의 1% 이상인 것이 바람직하다.The crimp width or taping width of the separator for pocketing the outermost electrode so that the outermost electrode does not physically contact the lead of the opposite electrode varies depending on the cell design but is preferably at least 1% of the outermost electrode size.

본 발명이 사용될 수 있는 전지의 비제한적인 예로는 리튬 이온 전지 및 리튬 이온 폴리머 전지, 리튬 폴리머 전지가 있다.Non-limiting examples of batteries in which the present invention can be used include lithium ion batteries, lithium ion polymer batteries, and lithium polymer batteries.

이하의 실시예를 통하여 본 발명을 더욱 상세하게 설명한다. 본 발명은 실시예에 한정되지 않는다. The present invention will be described in more detail with reference to the following examples. The present invention is not limited to the examples.

[실시예 1]Example 1

양극 3장과 음극 4장, 전극 보다 큰 크기의 분리막 5장을 적층하고, 최외곽 음극의 상하면에 있는 2장의 분리막을 150도에서 4초 열 압착하여 최외곽 음극을 분리막으로 포켓팅하여 전지를 구성한 후 포장하였다.Three anodes, four cathodes, and five separators larger than the electrode are laminated, and the two separators on the upper and lower surfaces of the outermost cathode are thermally compressed at 150 degrees for 4 seconds to pocket the outer cathode as a separator. It was packaged after construction.

[비교예 1]Comparative Example 1

포켓팅을 하지 않은 것을 제외하고는 실시예 1과 동일한 방법으로 전지를 구성하였다.A battery was constructed in the same manner as in Example 1 except for not pocketing.

<실험><Experiment>

상기 실시예 1 및 비교예 1에서 제조된 전지를 충전한 후 2m 높이에서 리드 방향이 충돌하도록 낙하실험을 10회 실시하여 전압 강하 정도를 확인하였으며, 그 결과를 표 1 및 2에 나타나 있다.After charging the batteries prepared in Example 1 and Comparative Example 1, the drop test was carried out 10 times to collide with the lead direction at a height of 2m to confirm the voltage drop degree, the results are shown in Tables 1 and 2.

상기 표 1에 나타난 바와 같이, 최외곽 전극 상, 하면에 있는 2개의 분리막을 부분적으로 열 압착하여 최외곽 전극을 포켓팅하여 제조한 전지는 낙하 실험에서 쇼트 방지 효과를 확인할 수 있었다. 반면 비교예의 경우 낙하 실험에서 쇼트로 인한 전압 강하 현상이 발생함을 확인하였다.As shown in Table 1, the battery manufactured by pocketing the outermost electrode by partially thermally compressing two separators on the outermost and lower surfaces of the outermost electrode was able to confirm the short prevention effect in the drop test. On the other hand, it was confirmed that the voltage drop phenomenon due to the short occurred in the drop test in the comparative example.

도 1은 최외곽 전극과, 다른 전극에 연결된 리드 간에 발생할 수 있는 쇼트를 방지하기 위해 최외곽 전극 상, 하면에 있는 2개의 분리막을 열 압착하여 최외곽 전극을 포켓팅(pocketing)시킨 일 실시예를 나타내는 모식도이다.FIG. 1 illustrates an embodiment in which two separators on top and bottom of the outermost electrode are thermally compressed to pocket the outermost electrode to prevent a short circuit between the outermost electrode and a lead connected to another electrode. It is a schematic diagram showing.

Claims (2)

1개 이상의 양극 층; 상기 양극 층과 교번하여 적층된 1개 이상의 음극 층; 및 상기 양극 층과 음극 층 사이 및 최외곽 전극 층의 표면에 각각 1개의 분리막이 적층된 분리막 층을 포함하는 전지로서, 최외곽 전극의 상하에 각각 적층된 2개의 분리막에 의해 최외곽 전극이 일부 또는 전부 포켓팅됨으로써 최외곽 전극과 반대 전극 리드가 분리막에 의해 분리된 전지.At least one anode layer; At least one cathode layer laminated alternately with the anode layer; And a separator layer in which one separator is laminated between the anode layer and the cathode layer and on the surface of the outermost electrode layer, wherein the outermost electrode is partially formed by two separators respectively stacked on and under the outermost electrode. Or a battery in which the outermost electrode and the opposite electrode lead are separated by a separator by fully pocketing. 제1항에 있어서, 분리막으로 최외곽 전극을 포켓팅하는 방법은 2개의 분리막을 열 압착하거나, 테이프로 일체화하는 것인 전지.The battery according to claim 1, wherein the method of pocketing the outermost electrode with the separator is one in which the two separators are thermally compressed or integrated with a tape.
KR10-2003-0017574A 2003-03-20 2003-03-20 The laminated cell with the outmost electrode pocketed by two separators KR100513645B1 (en)

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