WO2016064259A1 - 배터리용 분리막 커팅 방법 및 이에 의하여 제조된 배터리용 분리막 - Google Patents
배터리용 분리막 커팅 방법 및 이에 의하여 제조된 배터리용 분리막 Download PDFInfo
- Publication number
- WO2016064259A1 WO2016064259A1 PCT/KR2015/011337 KR2015011337W WO2016064259A1 WO 2016064259 A1 WO2016064259 A1 WO 2016064259A1 KR 2015011337 W KR2015011337 W KR 2015011337W WO 2016064259 A1 WO2016064259 A1 WO 2016064259A1
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- WIPO (PCT)
- Prior art keywords
- cutting
- laser
- separator
- separation membrane
- battery
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Classifications
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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
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
- H01M50/406—Moulding; Embossing; Cutting
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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
- H01M10/052—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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
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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
- 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
Definitions
- the present invention is a method for cutting a separator for a battery using a laser cutting technology capable of free shape processing.
- Lithium-ion batteries are an important component of the mobile and electric vehicle era, and there is a constant need for increased capacity. In order to maximize the utilization of the internal space of mobile and automobile, it is necessary to manufacture the battery manufacturing technology of circular, three-dimensional structure and various shapes, rather than the existing rectangular shape.
- the separator in order to manufacture a battery having an amorphous shape such as a circle, a three-dimensional structure, and various shapes, rather than a conventional rectangular shape, the separator as well as the electrode for battery manufacturing must be able to be cut into various shapes.
- the separation membrane cutting process must be performed through a process of cutting the separator with a simple one-letter cutting knife, or by manufacturing a mold suitable for the shape of the battery and cutting the separator.
- Korean Patent Laid-Open No. 10-2012-0043941 discloses a laser cutting device for cutting a film used to cut a laminated film and a film cutting method using the same. There is a problem in that it is not suitable for cutting and does not exhibit optimal cutting performance.
- the present invention is to solve the problems of the prior art as described above,
- the purpose is to have a stable cut surface compared to the physical cutting by cutting by applying a laser to the cutting process of the separation membrane where a crack or the like has occurred.
- a method of cutting a separator for a battery for cutting a separator by irradiating a laser onto the separator the method of cutting a separator having a pulse repetition rate of 10 to 500 kHz.
- the present invention provides a separator cutting apparatus using a biaxial beam scanner and an F-theta lens capable of two-dimensional light transmission for light transmission as a separator cutting apparatus using the cutting method.
- the present invention provides a separator for a battery manufactured by the cutting method.
- the present invention also provides a battery comprising the separator.
- the laser cutting is applied to the cutting step of the separation membrane, which has a problem such as roughness of the cut surface by the conventional physical cutting process, the user can process any shape desired
- the user can process any shape desired
- separate mold design and manufacturing are not required, and various shapes of separators can be performed without changing molds, making mold exchange easier and reducing mold costs.
- FIG. 1 is a photograph showing a cross section of a cut separator according to the pulse repetition rate, using the cutting method of the present invention.
- Figure 2 is a photograph showing the result of cutting the separation membrane laminated in 20 layers using the cutting method of the present invention.
- Figure 3 is a photograph showing a cross section of the cut separator according to the cutting speed, using the cutting method of the present invention.
- Figure 4 is a photograph showing a cross section of the cut surface produced by a cutting method of the prior art.
- Figure 5 is a photograph showing a cross section of the cut surface of the separator prepared by the CO 2 laser of the present invention.
- the method for cutting a separator according to the present invention is characterized in that the pulse repetition rate of the laser is 10 to 500 kHz in cutting the separator by irradiating a laser onto the separator.
- the method for cutting a separator according to the present invention may be applied to a cutting process for cutting a separator included in a battery, more specifically, a battery for secondary batteries, and more specifically a polymer battery for secondary batteries.
- a battery separator to be cut is prepared.
- the separation membrane may include a coating layer on one or both sides of the base layer and the base layer.
- the base layer is not particularly limited, but may preferably include a polyolefin-based polymer.
- the battery separator may be a structure in which two or more separators are stacked.
- the present invention may simultaneously cut a plurality of separators due to technical features described below.
- the coating layer is not particularly limited as long as it includes alumina.
- a self reinforcement structure (SRS) coating layer containing alumina may be used.
- the separator may have a thickness of 5 to 50 ⁇ m, and more preferably, a thickness between 10 and 25 ⁇ m may be used.
- the present invention uses a laser.
- a laser is used for the cutting, and preferably, a pulse laser or a CO 2 laser may be used as the laser used in the present invention, but is not limited thereto.
- a pulse laser or a CO 2 laser may be used as the laser used in the present invention, but is not limited thereto.
- a pulse repetition rate of 10 to 500 kHz may be used, preferably a pulse repetition rate of 10 to 100 kHz may be used, and more preferably a pulse repetition rate of 10 to 40 kHz.
- a pulse repetition rate of 10 to 100 kHz may be used, and more preferably a pulse repetition rate of 10 to 40 kHz.
- the laser may be used having a cutting speed of 700 to 2000mm / s.
- a cutting speed of 700 to 2000mm / s it is possible to obtain a cutting surface of the separator which is excellently stable compared to the physical cutting process at the time of cutting the separator.
- the laser may use a wavelength of 300 to 1200nm.
- the laser may use a pulse width of 5 to 500nm.
- the output of the laser is preferably 20 ⁇ 500W, more preferably 50 ⁇ 200W, most preferably 50 ⁇ 100W shows the most economically effective results. .
- the output of the laser can be used 10 ⁇ 200W, the spot size may be used 50 ⁇ 200um.
- the separator can be cut at a production speed of 300 to 2000 mm / s.
- the cutting tolerance of the separation membrane of 100 ⁇ m or less may be adjusted by the scanning accuracy of the two-dimensional scanner and the tolerance of the mechanism for fixing the separator.
- the present invention provides a battery separator manufactured by the cutting method of the separator.
- the separator for a battery manufactured by the present invention is cut by a pulse laser, the surface and the cross section of the cut surface are much smoother and the occurrence of cracks is significantly reduced. This is an excellent surface properties compared to the separator for a battery produced by the conventional method.
- the present invention is a separator cutting device using the cutting method
- a separator cutting device using a two-axis beam scanner and an F-theta lens capable of two-dimensional light transmission for light transport.
- the present invention provides a battery including the battery separator.
- the separator for battery manufactured by LG Chem
- the separator was cut using a Fiber Pulse / CW variable laser device (SPI, G4).
- the 50 W pulse laser in the cutting process was cut under the conditions of a wavelength of 1070 nm, a pulse width of 100 nm, a pulse repetition rate of 75 kHz, and a cutting speed of 1000 mm / s.
- the pulse repetition rate of the laser device was 20 kHz, and 20 separation membranes were laminated, they were cut under the same conditions as in Example 1 except that the number of laser irradiation times for cutting was increased to ten times.
- the 50W pulse laser at the time of the cutting process was cut under the same conditions as in Example 1 except that the laser was cut under the conditions of a pulse repetition rate of 400 kHz and a cutting speed of 800 mm / s.
- Cutting was carried out under the same conditions as in Example 6 except that the cutting speed of the laser device was 1000 mm / s.
- Cutting was carried out under the same conditions as in Example 6 except that the cutting speed of the laser device was 600 mm / s.
- the separator was cut using scissors, a conventional physical cutting method.
- a 12 W CO 2 laser was used, and under the conditions of pulse repetition rate of 100 kHz and cutting speed of 500 mm / s, cutting was carried out under the same conditions as in Example 1 except that the wafer was cut to a spot size of 50 ⁇ m.
- a 40 W CO 2 laser was used and cut under the same conditions as in Example 8 except for cutting at a spot size of 150 um under conditions of a pulse repetition rate of 20 kHz and a cutting speed of 2400 mm / s.
- Example 9 Using a CO 2 laser of 80W, it was cut under the same conditions as in Example 9 except for cutting to a spot size of 660um.
- Example 1 to 7 and Comparative Examples 1 to 4 were photographed by using an optical microscope (Olympus BX51, Olympus, Inc.), and Examples 1 to 4 and Comparative Example 1 were taken.
- Example 5 and Comparative Example 2 are shown in FIG. 2
- Examples 6-7 and Comparative Example 2 are shown in FIG. Looking at Figure 1 showing the cross-section of the cut separator according to the pulse repetition rate, in Comparative Example 1 shown in Figure 1 (e), the separation of the coating layer and the base layer of the separator is very difficult, the cross section is rough, a large amount of It can be seen that cracks occur.
- Examples 1 to 4 shown in (a) to (d) of FIG. 1 it was found that the distinction between the base layer and the coating layer is clear, and cracks are hardly seen on the cross section.
- Example 5 shown in FIG. 2 (a)
- the separation membrane of the uppermost layer ((c) of FIG. 2) and ,
- the cross section of the lowermost separator (FIG. 2 (d)) was cut in the same manner, and the separation between the base layer and the coating layer was clear and almost no cracks appeared on the cross section.
- Comparative Example 2 shown in (b) of FIG. 2 it can be seen that the separation of the coating layer and the substrate layer of the separation membrane is very difficult, the cross section is rough, and a large amount of cracks are generated.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Cell Separators (AREA)
Abstract
Description
Claims (19)
- 분리막 상에 레이저를 조사하여 분리막을 커팅하는 배터리용 분리막의 커팅 방법으로서,상기 레이저의 펄스반복율이 10 내지 500kHz 인 분리막의 커팅 방법.
- 청구항 1에 있어서,상기 레이저의 커팅속도가 700 내지 1000 mm/s 인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 2에 있어서,상기 레이저의 커팅속도가 800 내지 1000 mm/s 인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 1에 있어서,상기 레이저의 펄스반복율이 10 내지 100kHz 인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 4에 있어서,상기 레이저의 펄스반복율이 10 내지 40kHz 인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 1에 있어서,상기 레이저는 펄스 레이저 또는 CO2 레이저인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 1에 있어서,상기 레이저의 출력 용량이 20~500W 인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 7에 있어서,상기 레이저의 출력 용량이 50~200W 인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 8에 있어서,상기 레이저의 출력 용량이 50~100W 인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 1에 있어서,상기 레이저의 파장이 300 내지 1200nm 인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 1에 있어서,상기 레이저의 Pulse 폭이 5 내지 500nm 인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 6에 있어서,상기 CO2레이저의 spot size는 50~200um 인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 1에 있어서,상기 분리막은 2장 이상의 분리막이 적층된 구조인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 1에 있어서,상기 분리막은 비정형(irregular) 분리막인 것을 특징으로 하는 분리막의 커팅 방법.
- 청구항 1의 커팅 방법을 이용하는 분리막 커팅 장치로서,광 이송을 위한 2차원 광전송이 가능한 2축 Beam Scanner및 F-theta Lens를 사용하는 것을 특징으로 하는 분리막 커팅 장치.
- 청구항 1의 커팅 방법에 의하여 제조된 것을 특징으로 하는 배터리용 분리막.
- 청구항 16의 배터리용 분리막을 포함하는 것을 특징으로 하는 배터리.
- 청구항 17에 있어서,상기 배터리는 이차전지용 배터리인 것을 특징으로 하는 배터리.
- 청구항 18에 있어서,상기 배터리는 이차전지용 폴리머 배터리인 것을 특징으로 하는 배터리.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US15/513,367 US20170301900A1 (en) | 2014-10-24 | 2015-10-26 | Method for cutting separation membrane for battery, and separation membrane for battery manufactured thereby |
EP15851832.4A EP3211692B1 (en) | 2014-10-24 | 2015-10-26 | Method for cutting separation membrane for battery |
JP2017515717A JP6465963B2 (ja) | 2014-10-24 | 2015-10-26 | バッテリー用分離膜カッティング方法及びこれによって製造されたバッテリー用分離膜 |
CN201580052438.7A CN106716678B (zh) | 2014-10-24 | 2015-10-26 | 用于切割电池用分隔膜的方法以及由此制造的电池用分隔膜 |
US17/362,519 US20210328305A1 (en) | 2014-10-24 | 2021-06-29 | Method for cutting separation membrane for battery, and separation membrane for battery manufactured thereby |
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KR20140145373 | 2014-10-24 | ||
KR10-2014-0145373 | 2014-10-24 | ||
KR1020150148290A KR101840520B1 (ko) | 2014-10-24 | 2015-10-23 | 배터리용 분리막 커팅 방법 및 이에 의하여 제조된 배터리용 분리막 |
KR10-2015-0148290 | 2015-10-23 |
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US15/513,367 A-371-Of-International US20170301900A1 (en) | 2014-10-24 | 2015-10-26 | Method for cutting separation membrane for battery, and separation membrane for battery manufactured thereby |
US17/362,519 Continuation US20210328305A1 (en) | 2014-10-24 | 2021-06-29 | Method for cutting separation membrane for battery, and separation membrane for battery manufactured thereby |
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Cited By (1)
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CN109075293A (zh) * | 2016-11-29 | 2018-12-21 | 株式会社Lg化学 | 包含激光诱导的碳化石墨烯层的隔膜和包含所述隔膜的锂-硫电池 |
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KR20130102711A (ko) * | 2012-03-08 | 2013-09-23 | 주식회사 엘지화학 | 이차전지용 전극 가공장치 |
KR20130124341A (ko) * | 2010-12-03 | 2013-11-13 | 리-텍 배터리 게엠베하 | 시트형 또는 플레이트형 물체들을 절단하는 방법 및 시스템 |
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KR20010007879A (ko) * | 2000-10-16 | 2001-02-05 | 박사인 | 리튬 이차전지용 전극 제조방법 |
KR20130124341A (ko) * | 2010-12-03 | 2013-11-13 | 리-텍 배터리 게엠베하 | 시트형 또는 플레이트형 물체들을 절단하는 방법 및 시스템 |
US20120276435A1 (en) * | 2011-04-26 | 2012-11-01 | Eaglepicher Technologies, Llc | Method of forming encapsulated solid electrochemical component |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109075293A (zh) * | 2016-11-29 | 2018-12-21 | 株式会社Lg化学 | 包含激光诱导的碳化石墨烯层的隔膜和包含所述隔膜的锂-硫电池 |
CN109075293B (zh) * | 2016-11-29 | 2021-06-22 | 株式会社Lg化学 | 包含激光诱导的碳化石墨烯层的隔膜和包含所述隔膜的锂-硫电池 |
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