WO2023075426A1 - 이차 전지용 전극 제조 장치 - Google Patents
이차 전지용 전극 제조 장치 Download PDFInfo
- Publication number
- WO2023075426A1 WO2023075426A1 PCT/KR2022/016500 KR2022016500W WO2023075426A1 WO 2023075426 A1 WO2023075426 A1 WO 2023075426A1 KR 2022016500 W KR2022016500 W KR 2022016500W WO 2023075426 A1 WO2023075426 A1 WO 2023075426A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ring member
- manufacturing apparatus
- electrode
- current collector
- ring
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 239000007772 electrode material Substances 0.000 claims abstract description 32
- 238000003825 pressing Methods 0.000 claims abstract description 32
- 238000005096 rolling process Methods 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 12
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 description 14
- 238000010168 coupling process Methods 0.000 description 14
- 238000005859 coupling reaction Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011149 active material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- 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 relates to an apparatus for manufacturing an electrode of a secondary battery. More specifically, it relates to a manufacturing apparatus for the uncoated portion of an electrode base material.
- lithium secondary batteries are widely used as an energy source for various mobile devices as well as various electronic products in that they have high energy density and high operating voltage and excellent preservation and lifespan characteristics.
- a secondary battery includes an electrode assembly formed by interposing a separator, which is a separator, between a positive electrode and a negative electrode.
- the positive electrode and the negative electrode are each formed by coating an electrode active material on a current collector of an electrode substrate.
- problems such as folding or wrinkles should not occur on the current collector even after the electrode active material is coated on the current collector of the electrode substrate.
- An object to be solved by the present invention is to provide an apparatus for manufacturing an electrode for a secondary battery capable of preventing defects from occurring on a non-coated portion of an electrode substrate during a manufacturing process of an electrode for a secondary battery.
- An apparatus for manufacturing an electrode for a secondary battery includes a transfer unit for transporting a current collector from an unwinder, a coating unit for applying an electrode active material to at least one surface of the current collector, and a coating unit disposed on the transfer unit to transfer the electrode active material. It includes a rolling unit for rolling the electrode active material layer constituted by, and a pressing unit disposed adjacent to the rolling unit and pressurizing the uncoated portion of the current collector to which the electrode active material is not applied.
- the pressing unit includes a roll member and a ring assembly detachably coupled to the roll member and pressurizing the uncoated portion by contacting the uncoated portion.
- the ring assembly includes a first ring member detachably fixed to the roll member, and a second ring member having a larger diameter than the diameter of the first ring member and connected to the first ring member to press the pressing unit.
- a third ring member having elasticity may be coupled to an outer circumferential surface of the second ring member, and the third ring member may be rubber.
- a depression may be formed on an inner surface of the third ring member, a protrusion may be formed on an outer circumferential surface of the second ring member, and the protrusion of the second ring member may be fitted into the depression of the third ring member.
- Both ends of the first ring member may be formed as free ends, and openings for screw coupling may be provided in extension portions respectively extending from the both ends.
- Each of the extension parts may have a length longer than the width of the first ring member and may be disposed parallel to the roll member.
- the first ring member may be rotatably coupled to the second ring member.
- Each of the extension parts may extend vertically from both ends.
- a width of the second ring member may be smaller than a width of the uncoated portion.
- Both ends of the roll member are connected to the elevation arm and the cylinder, respectively, so that the roll member can be displaced relative to the current collector.
- a plurality of ring assemblies may be installed on the roll member at equal intervals.
- the pressing unit may be disposed at a front end and a rear end of the rolling unit, respectively.
- the pressing unit may be configured to press the uncoated portion of the first surface of the current collector and the uncoated portion of the second surface opposite to the first surface, respectively.
- the electrode manufacturing apparatus during the manufacturing process of an electrode for a secondary battery, presses the uncoated part with a ring assembly that rotates by a roll member to prevent wrinkles in the uncoated part in advance, thereby improving manufacturing process efficiency.
- high quality electrodes can be provided.
- FIG. 1 is a schematic diagram showing an electrode manufacturing apparatus according to an embodiment of the present invention.
- FIG. 2 is a partial perspective view showing an electrode manufacturing apparatus according to an embodiment of the present invention.
- FIG. 3 is a perspective view illustrating a pressing part of an electrode manufacturing apparatus according to an embodiment of the present invention.
- Figure 4 is a perspective view showing a modified embodiment of the pressing unit of Figure 3;
- FIG. 5 is a cross-sectional view showing a ring assembly of an electrode manufacturing apparatus according to another embodiment of the present invention.
- FIG. 6 is a schematic diagram showing an electrode manufacturing apparatus according to another embodiment of the present invention.
- the electrode manufacturing apparatus 100 includes a roller-shaped unwinder 110 in which a sheet-shaped current collector 101 made of a metal material (eg, copper) for a positive electrode or a negative electrode of a secondary battery is wound. do.
- a metal material eg, copper
- the current collector 101 unwound from the unwinder 110 is transported along one direction (from left to right in FIG. 1 ) by the transfer unit 120 of the electrode manufacturing apparatus 100 .
- the transfer unit 120 may include a plurality of rolls.
- the electrode active material 102 is applied (coated) to the current collector 101 transported by the transfer unit 120 by the coating unit 140 of the electrode manufacturing device 100, and the coated electrode active material 102 is used to manufacture the electrode. It is dried through the drying unit 150 of the device 100.
- the electrode active material layer 103 dried by the drying unit 150 is rolled by the rolling unit 160 of the electrode manufacturing apparatus 100, and the current collector 101 including the rolled electrode active material layer 103 is an electrode It is wound on the winder 170 of the manufacturing apparatus 100.
- the coating unit 140 is disposed to face the coating die 141 with the current collector 101 interposed therebetween the coating die 141 for flowing the electrode active material 102 toward the current collector 101, A coater roll 142 for applying tension to the current collector 101 may be included.
- coating of the electrode active material 102 by the coating unit 140 may be performed such that a plurality of electrode active material layers 103 are provided on the current collector 101 .
- a plurality of electrode active material layers 103 are provided on the current collector 101 .
- three lines of electrode active material layers 103 are provided on the current collector 101, between the electrode active material layer 103 and the electrode active material layer 103 to which no electrode active material is applied, and the electrode active material layer.
- An uncoated portion 105 is maintained between 103 and the edge of the current collector 101 .
- four lines of uncoated portions 105 are formed on the current collector 101 .
- the drying unit 150 is configured to evaporate the solvent from the electrode active material 102 to form the electrode active material layer 103, and the rolling unit 160 is disposed with the current collector 101 therebetween. It may be made of a pair of rollers 161 and 162, and the winding machine 170 may be made of a roller shape.
- the electrode active material layer 103 on the current collector 101 adjacent to the rollers 161 and 162 of the rolling unit 160 is folded into the uncoated portion 105 by the force generated when the electrode active material layer 103 is rolled by the rolling unit 160.
- a pressing unit 200 that presses the uncoated portion 105 is disposed.
- the pressing unit 200 is disposed at the rear end of the rolling unit 160 based on at least one side of the rolling unit 160, for example, in the conveying direction of the current collector 101 (eg, the arrow direction shown in FIG. 2) 2 shows that the pressing unit 200 is disposed on both sides of the rolling unit 160, that is, at the front and rear ends of the rolling unit 160.
- the pressing unit 200 includes a roll member 202 having a predetermined diameter and length and rotating by a driving source (not shown).
- the pressing unit 200 includes a ring assembly 204 detachably coupled to the roll member 202 .
- the ring assembly 204 contacts the uncoated portion 105 while rotating in conjunction with the rotation of the roll member 202 to press the uncoated portion 105 .
- FIG. 3 is a perspective view illustrating a pressing part of an electrode manufacturing apparatus according to an embodiment of the present invention.
- Figure 4 is a perspective view showing a modified embodiment of the pressing unit of Figure 3;
- the ring assembly 204 of the pressing part 200 includes a first ring member 2040 and a second ring member 2042 .
- the first ring member 2040 and the second ring member 2042 are connected to each other, and the second ring member 2042 may have a circular shape having a larger diameter than the first ring member 2040 .
- the first ring member 2040 and the second ring member 2042 are oppositely disposed between the first ring member 2040 and the second ring member 2042. (2044) to each other. Accordingly, the first ring member 2040 is spaced apart from the second ring member 2042 by an interval corresponding to the length of the connecting member 2044 .
- the second ring member 2042 is formed in a complete ring shape, while the first ring member 2040 is formed in a ring shape in which both ends, that is, both ends disposed on the upper side in the drawing are free ends. Accordingly, the first ring member 2040 can be moved by its own elastic force up to both ends while the portion connected to the connection member 2044 is used as a fixed point. Extensions 2046 extend from both ends of the first ring member 2042, respectively.
- the extension 2046 has a predetermined length and is disposed parallel to the longitudinal direction of the roll member 202, the length being greater than the width of the first ring member 2040 and the width being the first ring member 2040 and the second. It may be less than the distance between the two ring members 2042.
- each extension 2046 is provided with an opening 2048 for screwing of the coupling screw 2050 and the nut 2052, respectively. That is, the coupling screw 2050 is inserted into the opening 2048 of the extension portion 2046 and coupled with the nut 2052, so that the first ring member 2040 can be fixed to the roll member 202, and the coupling The first ring member 2040 may be separated from the roll member 202 due to the release of the screw 2050 and the nut 2052, which will be described in more detail below.
- attachment and detachment of the first ring member 2040 to and from the roll member 202 can not be achieved only by the coupling structure of the above coupling screw and nut.
- a third ring member 2054 having elasticity may be coupled to the second ring member 2042 .
- the third ring member 2054 is provided as a rubber and coupled to the outer circumferential surface of the second ring member 2042.
- the third ring member 2054 may be formed of a member made of other materials capable of having elasticity as well as rubber. Since the third ring member 2054 is formed of a material capable of having elasticity, such as rubber, it can help the current collector 101 to run smoothly. In other words, since the third ring member 2054 has elasticity, it can serve to drag the current collector 101 by using frictional force when rotating in a state of being in contact with the current collector 101 .
- the third ring member 2054 has elasticity, an effect of smoothing out wrinkles by applying tension to the uncoated portion 105 can be enhanced.
- the third ring member 2054 has elasticity, it can be easily coupled to the outer circumferential surface of the second ring member 2042 .
- a protrusion P for inserting a third ring member 2054 is formed on the outer circumferential surface of the second ring member 2042, and the inner surface of the third ring member 2054 A recessed portion D into which the protruding portion P is fitted may be formed.
- the width of the second ring member 2042 and the width of the third ring member 2054 may be substantially the same, and the width of the second and third ring members 2042 and 2054 may be substantially the same.
- the width may be equal to or smaller than the width of the uncoated portion 105 .
- a plurality of ring assemblies 204 configured as described above may be installed on the roll member 202 .
- the assembly 204 may be disposed on the roll member 202 with a gap corresponding to the width of the active material layer 103 interposed therebetween.
- the extension part 2046 of the two ring assemblies 204 faces the same direction (e.g., left with reference to FIG. : It may be installed on the roll member 202 so as to face the right side based on FIG. 2).
- the coupling between the ring assembly 204 and the roll member 202 is performed by inserting the first ring member 2040 of the ring assembly 204 into the roll member 202 and stopping at a desired position, the first ring member 2040 It can be made by inserting a coupling screw 2050 into the opening 2048 of the extension 2046 of and coupling a nut 2052 thereto.
- the first ring member 2040 can be fixed to the roll member 202, and thus the ring assembly 204 can be fixed to the roll member 202. .
- the pressing unit 200 configured as described above comes into contact with the uncoated portion 105 and presses the uncoated portion 105. . That is, as the roll member 202 of the pressing unit 200 rotates, the ring assembly 204 rotates and presses the uncoated portion 105 . Accordingly, even if the force according to the rolling of the rolling part 160 is transmitted to the uncoated part 105, the uncoated part 105 can be pressurized by the pressing part 200 to maintain tension, thereby preventing defects such as folding. can
- the pressing unit 200 presses the uncoated portion 105, as shown in FIG. ) and can be connected to the cylinder 302. That is, the pressing unit 200 displaces the roll member 202 with respect to the current collector 101 by the elevating arm 300 and the cylinder 302 connected to the roll member 202, so that the ring assembly 2040 is solid. The degree of pressing the part 105 can be adjusted.
- FIG. 5 is a front cross-sectional view showing a ring assembly according to another embodiment of the present invention.
- ring assembly 204' of another embodiment is made substantially the same as the ring assembly of the above-described embodiment, only the connection relationship between the first ring member 2040' and the second ring member 2042' is configured differently.
- the interconnection of the first ring member 2040' and the second ring member 2042' is such that the second ring member 2042' to the first ring member 2040' is or
- the first ring member 2040' may be rotatably coupled to the second ring member 2042'.
- the connecting member 2044' extending from the first ring member 2040' is rotatably coupled to the groove portion 2042" provided in the second ring member 2042',
- the first ring member 2040' may be rotatably coupled to the second ring member 2042'.
- the ring assembly 204' in another embodiment is formed by connecting the extensions 2046' extending from both ends of the first ring member 2040' to the first ring member 2040' and the second ring member 2040'. Even if it extends only vertically from both ends between 2042', the first ring member 2040' can be fixed to the roll member 202' by the coupling of the coupling screw 2050' and the nut 2052'. . At this time, coupling between the coupling screw 2050' and the nut 2052' can be achieved using a memory driver or the like.
- FIG. 6 is a schematic diagram illustrating a pressing unit according to another embodiment of the present invention.
- the pressing part 200A is not only the non-coated area of one side (eg, upper side) of the current collector 101, but also one side, as in the previously described embodiment. It may be arranged to press the non-coated area of the other side (eg, lower side) of the current collector 101 facing the .
- Electrode manufacturing device 100 Current collector: 101
- Electrode active material 102 Electrode active material layer: 103
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
Claims (14)
- 이차 전지용 전극을 제조하기 위한 장치로서,권출기로부터 집전체를 이송하는 이송부;상기 집전체의 적어도 일면에 전극 활물질을 도포하는 코팅부;상기 이송부 상에 배치되어 상기 전극 활물질에 의해 구성된 전극 활물질층을 압연하는 압연부; 및상기 압연부에 이웃하여 배치되며 상기 전극 활물질이 도포되지 않은 상기 집전체의 무지부를 가압하는 가압부를 포함하며,상기 가압부는,롤 부재: 및상기 롤 부재에 착탈 가능하게 결합되며 상기 무지부에 접촉되어 상기 무지부를 가압하는 링 어셈블리를 포함하는 전극 제조 장치.
- 제1항에 있어서,상기 링 어셈블리는,상기 롤 부재에 분리 가능하게 고정되는 제1 링 부재; 및상기 제1 링 부재의 직경보다 큰 직경을 가지고 상기 제1 링 부재에 연결되며 상기 가압부를 가압하는 제2 링 부재를 포함하는 전극 제조 장치.
- 제2항에 있어서,상기 제2 링 부재의 외주면에 탄성력을 갖는 제3 링 부재가 결합된 전극 제조 장치.
- 제3항에 있어서,상기 제3 링 부재는 러버인 전극 제조 장치.
- 제3항에 있어서,상기 제3 링 부재 내부면에 함몰부가 형성되고, 상기 제2 링 부재 외주면에는 돌출부가 형성되며,상기 제2 링 부재의 돌출부가 상기 제3 링 부재의 함몰부에 끼워지는 전극 제조 장치.
- 제2항에 있어서,상기 제1 링 부재는 양 단부가 자유단으로 이루어지고 상기 양 단부로부터 각기 연장된 연장부에는 나사 결합을 위한 개구가 제공된 전극 제조 장치.
- 제6항에 있어서,상기 각 연장부는 상기 제1 링 부재의 폭보다 긴 길이를 가지고 상기 롤 부재에 평행하게 배치되는 전극 제조 장치.
- 제6항에 있어서,상기 제1 링 부재가 상기 제2 링 부재에 회전 가능하게 결합되는 전극 제조 장치.
- 제8항에 있어서,상기 각 연장부가 양 단부로부터 수직하게 연장된 전극 제조 장치.
- 제2항에 있어서,상기 제2 링 부재의 폭이 상기 무지부의 폭 보다 작은 전극 제조 장치.
- 제1항에 있어서,상기 롤 부재의 양 단부가 각기 승강암 및 실린더에 연결되어 상기 롤 부재가 상기 집전체에 대해 변위되는 전극 제조 장치.
- 제1항에 있어서,상기 링 어셈블리가 상기 롤 부재에 등 간격 배치되어 복수로 설치되는 전극 제조 장치.
- 제1항에 있어서,상기 가압부가 상기 압연부의 전단 및 후단에 각기 배치되는 전극 제조 장치.
- 제1항 또는 제12항에 있어서,상기 가압부가 상기 집전체의 제1 면의 무지부 및 상기 제1 면에 대향하는 제2 면의 무지부를 각각 가압하도록 구성되는 전극 제조 장치.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023537691A JP2024500860A (ja) | 2021-10-27 | 2022-10-26 | 二次電池用電極製造装置 |
EP22887622.3A EP4261916A1 (en) | 2021-10-27 | 2022-10-26 | Apparatus for manufacturing electrode for secondary battery |
CN202280011399.6A CN116745925A (zh) | 2021-10-27 | 2022-10-26 | 制造二次电池的电极的设备 |
US18/273,448 US20240128428A1 (en) | 2021-10-27 | 2022-10-26 | Manufacturing Apparatus Of Electrode For Secondary Battery |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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KR10-2021-0144526 | 2021-10-27 | ||
KR20210144526 | 2021-10-27 | ||
KR10-2022-0138119 | 2022-10-25 | ||
KR1020220138119A KR20230060469A (ko) | 2021-10-27 | 2022-10-25 | 이차 전지용 전극 제조 장치 |
Publications (1)
Publication Number | Publication Date |
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WO2023075426A1 true WO2023075426A1 (ko) | 2023-05-04 |
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PCT/KR2022/016500 WO2023075426A1 (ko) | 2021-10-27 | 2022-10-26 | 이차 전지용 전극 제조 장치 |
Country Status (4)
Country | Link |
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US (1) | US20240128428A1 (ko) |
EP (1) | EP4261916A1 (ko) |
JP (1) | JP2024500860A (ko) |
WO (1) | WO2023075426A1 (ko) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005044539A (ja) * | 2003-07-23 | 2005-02-17 | Mitsubishi Heavy Ind Ltd | 二次電池用電極の製造方法及びロールプレス装置 |
KR20160141448A (ko) * | 2015-06-01 | 2016-12-09 | 주식회사 엘지화학 | 압연에 따른 전극 시트의 너울 또는 주름을 방지할 수 있는 전극 압연 장치 |
KR20170094642A (ko) * | 2016-02-11 | 2017-08-21 | 주식회사 엘지화학 | 가압롤들 간의 간격 조절이 가능한 가압장치 |
JP2018026334A (ja) * | 2016-07-27 | 2018-02-15 | 株式会社豊田自動織機 | 蓄電装置の電極、電極の製造装置及び電極の製造方法 |
CN208116536U (zh) * | 2018-04-02 | 2018-11-20 | 成都市银隆新能源有限公司 | 一种极片辊压装置 |
KR20210144526A (ko) | 2020-05-21 | 2021-11-30 | 한국조선해양 주식회사 | 잠금장치를 구비한 가변 피치 프로펠러 |
KR20220138119A (ko) | 2021-04-05 | 2022-10-12 | 송재문 | 전파 차폐재 제조방법 및 이에 의해 제조된 전파 차폐재 |
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2022
- 2022-10-26 JP JP2023537691A patent/JP2024500860A/ja active Pending
- 2022-10-26 US US18/273,448 patent/US20240128428A1/en active Pending
- 2022-10-26 WO PCT/KR2022/016500 patent/WO2023075426A1/ko active Application Filing
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KR20170094642A (ko) * | 2016-02-11 | 2017-08-21 | 주식회사 엘지화학 | 가압롤들 간의 간격 조절이 가능한 가압장치 |
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KR20210144526A (ko) | 2020-05-21 | 2021-11-30 | 한국조선해양 주식회사 | 잠금장치를 구비한 가변 피치 프로펠러 |
KR20220138119A (ko) | 2021-04-05 | 2022-10-12 | 송재문 | 전파 차폐재 제조방법 및 이에 의해 제조된 전파 차폐재 |
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