KR100336396B1 - Lithium Secondary Battery of Large Capacity and Producing Method Thereof - Google Patents
Lithium Secondary Battery of Large Capacity and Producing Method Thereof Download PDFInfo
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- KR100336396B1 KR100336396B1 KR1020000032285A KR20000032285A KR100336396B1 KR 100336396 B1 KR100336396 B1 KR 100336396B1 KR 1020000032285 A KR1020000032285 A KR 1020000032285A KR 20000032285 A KR20000032285 A KR 20000032285A KR 100336396 B1 KR100336396 B1 KR 100336396B1
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Abstract
본 발명은 대용량 리튬 이차 전지와 그의 제조방법에 관한 것으로 보다 상세하게는 (1) 격리막의 한쪽 면에 다수개의 양극판을 일정 간격으로 2열 접착하는 단계, (2) 상기 격리막의 다른 면에 다수개의 음극판을 일정간격으로 2열 접착하는 단계, (3) 다수개의 양극판과 다수개의 음극판이 접착된 상기 격리막을 양극판과 음극판이 교호하여 적층되도록 여러번 접는 단계, (4) 상기 (3)단계에서 형성된 2열의 적층구조를 그 중앙부를 접어서 하나의 적층구조로 만드는 단계를 포함함을 특징으로 하는 대용량 리튬 이차 전지의 제조방법 및 이에 의해 제조된 대용량 리튬 이차 전지에 관한 것으로, 본 발명에 의해 대용량 리튬 이차 전지의 생산효율을 높임과 동시에 성능과 안전성이 우수한 리튬 이차 전지를 제공할 수 있다.The present invention relates to a large-capacity lithium secondary battery and a method of manufacturing the same, and more particularly, (1) adhering a plurality of positive electrode plates on one side of a separator at regular intervals, and (2) a plurality of the other sides of the separator. Bonding two cathode plates at a predetermined interval; (3) folding the separator to which a plurality of positive electrode plates and a plurality of negative electrode plates are bonded several times so that the positive electrode plate and the negative electrode plate are alternately stacked; and (4) 2 formed in step (3). The present invention relates to a method for manufacturing a large capacity lithium secondary battery, and a large capacity lithium secondary battery produced thereby, comprising the step of folding a stacked structure of a column into a single stacked structure. It is possible to provide a lithium secondary battery having excellent performance and safety while improving production efficiency.
Description
본 발명은 대용량 리튬 2차 전지에 관한 것으로 보다 상세하게는 격리막의 한쪽 면에 다수개의 양극판을 일정 간격으로 2열 접착하는 단계, 상기 격리막의 다른 면에 다수개의 음극판을 일정간격으로 2열 접착하는 단계, 다수개의 양극판과 다수개의 음극판이 접착된 상기 격리막을 양극판과 음극판이 교호하여 적층되도록 여러번 접는 단계, 상기 단계에서 형성된 2열의 적층구조를 그 중앙부를 접어서 하나의 적층구조로 만드는 단계를 포함함을 특징으로 하는 대용량 리튬 이차 전지의 제조방법 및 이에 의해 생산된 대용량 리튬 이차 전지에 관한 것이다.The present invention relates to a large-capacity lithium secondary battery, and more particularly, a plurality of positive electrode plates bonded to one side of a separator at regular intervals in two rows, and a plurality of negative electrode plates bonded to the other side of the separator at regular intervals in two rows. Comprising a step of folding the separator to which a plurality of positive electrode plates and a plurality of negative electrode plates are bonded so that the positive electrode plate and the negative electrode plate are alternately stacked, folding the two rows of laminated structure formed in the step into a single laminated structure by folding the central portion The present invention relates to a method for manufacturing a large capacity lithium secondary battery, and a large capacity lithium secondary battery produced thereby.
일반적으로 리튬 이차 전지는 양극/격리막/음극의 3 단층 구조 또는 양극/격리막/음극/격리막/양극의 5단층 구조로 되어 있으며 이를 이용해 적정용량의 전지를 구현하기 위한 전지의 제작방법에는 적층방법과 와인딩방법(winding)이 있다.In general, a lithium secondary battery has a three-layer structure of a positive electrode, a separator, and a negative electrode, or a five-layer structure of a positive electrode, a separator, a cathode, a separator, and a positive electrode. There is a winding method.
도 1는 양극(2)/격리막(1)/음극(3)/격리막(1)/양극(2)의 구조를 갖는 단위 셀을 적층구조로 하는 리튬 2차 전지를 나타내며, 이는 각각의 전극판(2, 3)과 격리막(1)을 열접착(라미네이션)하여 단위셀을 만들고, 이 단위 셀을 다수개 적층하여 이를 용량에 맞추어 나란하게 연결한 구성을 갖는다.FIG. 1 shows a lithium secondary battery in which a unit cell having a structure of an anode 2, an isolation film 1, an anode 3, an isolation film 1 and an anode 2 is laminated. (2, 3) and the separator 1 is thermally bonded (laminated) to form a unit cell, and a plurality of unit cells are stacked to have a configuration in which they are connected side by side in accordance with their capacity.
그러나, 상기 도 1의 리튬 이차 전지는 양극판(2), 격리막(1)과 음극판(3)이 열접착(라미네이션)되어 밀착되어 있으므로 사용자의 오용 또는 충전기의 제어이상에 의해 계속 과충전될 경우 전압이 계속 상승하게 되어 결국 전지가 발화됨으로써 전지의 성능 및 안정성이 저하된다. 또한 각각의 전극판과 격리막의 열접착공정 및 단위 셀을 적층하는 공정이 복잡하여 전지생산성을 저하시키는 문제점이 있었다.However, in the lithium secondary battery of FIG. 1, since the positive electrode plate 2, the separator 1, and the negative electrode plate 3 are closely adhered to each other by thermal bonding (lamination), when the battery is continuously overcharged due to user misuse or abnormal control of the charger, the voltage As it continues to rise, the battery ignites eventually, degrading the performance and stability of the battery. In addition, there is a problem in that battery productivity is reduced due to the complicated process of thermal bonding of each electrode plate and the separator and a process of laminating unit cells.
도 2에 도시된 전지는 종래의 와인딩방법으로 형성한 리튬 이차 전지로서 용량에 맞는 길이의 양극(20)/격리막(10)/음극(30)의 구조를 가지는 단위 셀을 각형을 이루도록 와인딩 함으로써 형성된다.The battery shown in FIG. 2 is a lithium secondary battery formed by a conventional winding method, and is formed by winding a unit cell having a structure of a positive electrode 20 / isolation film 10 / negative electrode 30 having a length corresponding to a capacity to form a square. do.
이러한 와인딩타입의 각형 셀 구조의 경우, 노트북PC의 전지와 같은 대용량 리튬 이차 전지의 생산시, 양측면의 반경이 중앙부의 반경보다 급격히 작아져 극판이 손상 및 충전시 뒤틀림 (Distortion) 등의 문제가 발생할 가능성이 높으며, 과충전시의 발화 위험성을 여전히 해결하지 못하고 있다.In the case of such a rectangular cell structure of the winding type, when producing a large capacity lithium secondary battery such as a notebook PC battery, the radius of both sides is drastically smaller than the radius of the center part, which causes problems such as damage to the pole plate and distortion during charging. The likelihood is high and the risk of ignition during overcharging still remains unresolved.
상기와 같은 종래 기술의 문제점을 해결하여 전지의 성능 및 안전성을 개선시킴과 동시에 제조공정을 단순화하여 간편하게 생산가능한 대용량 리튬 이차 전지의 생산 방법 및 그에 의해 생산된 대용량 리튬 이차 전지를 제공한다.It provides a method for producing a large capacity lithium secondary battery that can be easily produced by improving the performance and safety of the battery and at the same time simplifying the manufacturing process by solving the problems of the prior art as described above, and a large capacity lithium secondary battery produced thereby.
도 1은 종래의 적층방법에 의한 리튬 이차 전지를 나타내는 사시도,1 is a perspective view showing a lithium secondary battery according to a conventional lamination method,
도 2는 종래의 와인딩방법에 의한 리튬 이차 전지를 나타내는 사시도,2 is a perspective view showing a lithium secondary battery according to a conventional winding method,
도 3은 본 발명의 일실시예에서 사용되는 음극판과 양극판의 형태를 나타내는 평면도,Figure 3 is a plan view showing the form of the negative electrode plate and the positive electrode plate used in one embodiment of the present invention,
도 4는 본 발명의 일실시예에서 격리막에 양극판과 음극판이 부착되는 상태를 타나내는 투시도,4 is a perspective view showing a state in which the positive electrode plate and the negative electrode plate is attached to the separator in one embodiment of the present invention,
도 5는 본 발명의 일실시예에서 양극판과 음극판이 교호적층되는 방법을 나타내는 설명도,5 is an explanatory diagram showing a method of alternately stacking a positive electrode plate and a negative electrode plate in one embodiment of the present invention;
도 6은 본 발명의 일실시예에서 양극판과 음극판이 교호적층된 후의 상태를 나타내는 사시도,6 is a perspective view showing a state after the positive electrode plate and the negative electrode plate are laminated in an embodiment of the present invention,
도 7은 본 발명의 일실시예에서 완성된 대용량 리튬 이차 전지 셀구조를 나타내는 사시도이다.7 is a perspective view showing a large capacity lithium secondary battery cell structure completed in one embodiment of the present invention.
* 도면의 중요한 부분의 부호의 설명* Explanation of symbols of important parts of the drawings
1, 10, 100: 격리막 2, 20, 200: 양극판1, 10, 100: separator 2, 20, 200: positive electrode plate
240: 양극판 그리드 3, 30, 300: 음극판240: positive electrode plate grid 3, 30, 300: negative electrode plate
340: 음극판 그리드340: negative electrode plate grid
본 발명 상기와 같은 목적을 달성하기 위해 격리막의 한쪽 면에 다수개의 양극판을 일정 간격으로 2열 접착하는 단계, 상기 격리막의 다른 면에 다수개의 음극판을 일정간격으로 2열 접착하는 단계, 다수개의 양극판과 다수개의 음극판이 접착된 상기 격리막을 양극판과 음극판이 교호하여 적층되도록 여러번 접는 단계, 상기 단계에서 형성된 2열의 적층구조를 그 중앙부를 접어서 하나의 적층구조로 만드는단계를 포함함을 특징으로 하는 대용량 리튬 이차 전지의 제조방법 및 이에 의해 생산된 대용량 리튬 이차 전지를 제공한다.In order to achieve the above object, a plurality of bipolar plates are bonded to one surface of a separator at regular intervals in two rows, and a plurality of bipolar plates are bonded to the other surface of the separator at regular intervals in a plurality of positive plates. And folding the separator to which a plurality of negative electrode plates are bonded so that the positive electrode plate and the negative electrode plate are alternately stacked, and folding the central portion of the two-layer lamination structure formed in the step into a single lamination structure. Provided are a method of manufacturing a lithium secondary battery and a large capacity lithium secondary battery produced thereby.
이하 본 발명의 실시예를 통하여 본 발명을 보다 구체적으로 설명하고자 하나, 하기의 실시예에 의해 본 발명의 권리범위를 제한하고자 하는 것은 아니다.Hereinafter, the present invention will be described in more detail through examples of the present invention, but the scope of the present invention is not intended to be limited by the following examples.
본 발명에서 사용되는 양극판은 예를 들어 알루미늄으로 이루어진 금속판 위에 양극활 물질을 도포, 건조하여 이를 일정한 크기로 절단하여 제작하며, 음극판은 예를 들어 구리로 이루어진 금속판 위에 음극활 물질을 도포, 건조하여, 이를 일정한 크기로 절단하여 제작한다. 양극활 물질로는 스피넬 혹은 층상구조를 이루고 있는 LiCO2, LiMn2O4와 같은 물질이 사용될 수 있으나 이에 한정되지 않는다. 음극활물질로는 요구되는 전기화학적 특성을 가지도록 처리된 흑연계나 탄소계열의 재료를 사용할 수 있으며, 대표적인 물질로는 메조카본 마이크로비드(mesocarbon microbeads, MCMB)와 메조-페이스 피치 카본필름(meso-phase pitch carbon film)계열의 탄소재가 있으나 이에 한정되지는 않는다. 그 형태는 예시적으로 도 3과 같은 구조를 가질 수 있다. 양극판(200) 및 음극판(300)은 전체적으로 정사각형의 형태로 절단되었으며, 한쪽에 그리드(240, 340)가 형성되어 있으며, 이 그리드 부위에는 양극활 물질 또는 음극활 물질이 도포되지 않아야 한다.The positive electrode plate used in the present invention, for example, by coating a positive electrode active material on a metal plate made of aluminum, dried to cut it to a certain size, the negative electrode plate is applied to a metal plate made of copper, for example, by drying , It is produced by cutting to a certain size. As the cathode active material, a material such as spinel or LiCO 2 or LiMn 2 O 4 having a layered structure may be used, but is not limited thereto. As the negative electrode active material, graphite- or carbon-based material treated to have required electrochemical properties may be used. Representative materials include mesocarbon microbeads (MCMB) and meso-face pitch carbon films (meso- phase pitch carbon film) series carbon materials, but is not limited thereto. The form may have a structure as illustrated in FIG. 3. The positive electrode plate 200 and the negative electrode plate 300 are cut in a square shape as a whole, and grids 240 and 340 are formed at one side thereof, and the positive electrode active material or the negative electrode active material should not be applied to the grid portion.
격리막으로는 폴리에틸렌 또는 폴리프로필렌으로 이루어진 단층 또는 다층의 폴리머다공질막을 사용할 수 있다. 격리막 표면에서 음극판 또는 양극판을 접착시키기 위해 접착제가 도포된다.As the separator, a single layer or multilayer polymer porous membrane made of polyethylene or polypropylene may be used. An adhesive is applied to bond the negative electrode plate or the positive electrode plate to the separator surface.
다음으로 격리막 위에 양극판과 음극판이 도 4과 같이 배치되어 접착된다.격리막(100)의 한쪽 면에는 다수개의 양극판(200)이 일정 간격으로 2열로 접착되며, 다른 쪽 면 역시 다수개의 음극판(300)이 일정 간격으로 2열로 접착된다. 양극판(200)과 음극판(300)은 도 4와 같이 격리막(100)을 중심으로 서로 어긋나도록 배치될 수 있으며 이와 반대로 서로 대응하도록 배치될 수 있다. 이때 격리막(100)을 접어 적층시킨 후, 양극판(240)의 그리드는 양극판의 그리드대로, 음극판의 그리드(340)는 음극판의 그리드대로 각각 집합될 수 있도록 그리드의 위치를 배치시켜야 한다.Next, the positive electrode plate and the negative electrode plate are disposed on and separated from each other as shown in FIG. 4. A plurality of positive electrode plates 200 are bonded in two rows to one side of the isolation membrane 100 at regular intervals, and the other side of the plurality of negative electrode plates 300 is also bonded. It is bonded in two rows at regular intervals. The positive electrode plate 200 and the negative electrode plate 300 may be disposed to be shifted from each other with respect to the separator 100 as shown in FIG. 4, and vice versa. At this time, after stacking the insulating film 100, the grid of the positive electrode plate 240 must be arranged as the grid of the positive electrode plate, the grid plate 340 of the negative electrode plate must be arranged so that the grid of the negative electrode plate, respectively.
양극판(200)과 음극판(300)이 부착된 격리막(100)은 도 5에서 표시된 것과 같은 방법으로 여러번 접혀져서 양극판(200)과 음극판(300)이 서로 교호되도록 적층된다. 양극판(200)과 음극판(300)이 서로 대응하도록 배치된 경우에도 도 5에서 표시된 방법에 의해 교호 적층될 수 있다. 이 때 도 6에 도시된 바와 같이 양극판의 그리드(240)와 음극판의 그리드(340)는 각각 적층구조의 양단으로 집합된다.The separator 100 to which the positive electrode plate 200 and the negative electrode plate 300 are attached is folded several times in the same manner as shown in FIG. 5 so that the positive electrode plate 200 and the negative electrode plate 300 are alternately stacked. Even when the positive electrode plate 200 and the negative electrode plate 300 are disposed to correspond to each other, they may be alternately stacked by the method shown in FIG. 5. In this case, as shown in FIG. 6, the grid 240 of the positive electrode plate and the grid 340 of the negative electrode plate are gathered at both ends of the stacked structure.
적층된 전지판의 형태는 도 6과 같으며, 격리막에 형성된 2열의 적층구조를 접음선(500)을 따라 접어 하나의 적층구조로 결합하여 적층을 완료한다. 이 때, 양극판의 그리드(240)와 음극판의 그리드(340)는 각각 하나의 위치에 집합되며 이것을 초음파 융착기로 융착하면 도 7과 같은 대용량 셀의 내부가 완성된다. 융착된 그리드를 일정한 길이로 절단한 후 탭을 초음파로 융착한다. 이후 자동포장, 전해액주입에 의해 완전한 셀 형태를 이루고 난 후 진공포장하여 극판과 극판사이가 밀착되도록 하여 본 발명에 의한 대용량 리튬 이차 전지를 완성할 수 있다.The stacked panels are the same as in FIG. 6, and the two rows of stacked structures formed in the separator are folded along the fold line 500 to be combined into one stacked structure to complete the stacking. At this time, the grid 240 of the positive electrode plate and the grid 340 of the negative electrode plate are gathered at one position, respectively, and when fused with the ultrasonic welding machine, the inside of the large-capacity cell as shown in FIG. 7 is completed. The welded grid is cut to a constant length and the tab is ultrasonically welded. Then, after forming a complete cell form by automatic packaging and electrolyte injection, vacuum packing is performed so that the electrode plate and the electrode plate are in close contact with each other to complete the large capacity lithium secondary battery according to the present invention.
상기와 같은 본 발명에 의해 대용량 이차 리튬 전지의 제조공정을 보다 단순화하여 생산효율을 높임과 동시에 전지의 성능 및 안정성을 향상시키고 다양한 모양, 크기 및 원하는 용량의 전지를 용이하게 제조할 수 있도록 하고 있다.According to the present invention as described above, to simplify the manufacturing process of a large-capacity secondary lithium battery to improve the production efficiency and at the same time to improve the performance and stability of the battery and to easily manufacture a battery of various shapes, sizes and desired capacity. .
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| KR1020000032285A KR100336396B1 (en) | 2000-06-12 | 2000-06-12 | Lithium Secondary Battery of Large Capacity and Producing Method Thereof |
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| CN102299294B (en) * | 2011-07-14 | 2013-12-18 | 美国电化学动力公司 | Fragment type cell and preparation method thereof |
| KR101663351B1 (en) * | 2013-10-31 | 2016-10-06 | 주식회사 엘지화학 | Cell for electrochemical device and preparation method thereof |
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