WO2022119220A1 - 이차전지 및 이를 포함하는 디바이스 - Google Patents
이차전지 및 이를 포함하는 디바이스 Download PDFInfo
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- WO2022119220A1 WO2022119220A1 PCT/KR2021/017337 KR2021017337W WO2022119220A1 WO 2022119220 A1 WO2022119220 A1 WO 2022119220A1 KR 2021017337 W KR2021017337 W KR 2021017337W WO 2022119220 A1 WO2022119220 A1 WO 2022119220A1
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- electrode
- flexible
- secondary battery
- electrode assembly
- case
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Images
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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
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Definitions
- the present invention relates to a secondary battery and a device including the same, and more particularly, to a secondary battery for preventing disconnection of an electrode tab and a device including the same.
- lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries having advantages such as high energy density, discharge voltage, and output stability.
- Secondary batteries are also classified according to the structure of an electrode assembly in which a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode are stacked.
- a jelly roll-type electrode assembly having a structure in which long sheet-shaped positive and negative electrodes are wound with a separator interposed therebetween, a plurality of positive and negative electrodes cut into units of a predetermined size are sequentially stacked with a separator interposed therebetween. and stacked electrode assemblies.
- the secondary battery is a cylindrical secondary battery in which the electrode assembly is built in a cylindrical case, a prismatic secondary battery in which the electrode assembly is built in a prismatic case, and the electrode assembly is built in a pouch-type case of a laminate sheet. It may be classified as a pouch-type secondary battery.
- FIG. 1 is a perspective view of a conventional pouch-type secondary battery
- FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1 .
- the conventional pouch-type secondary battery 10 may be manufactured by accommodating the electrode assembly 20 inside the pouch-type battery case 30 and sealing the electrode assembly 20 .
- the electrode assembly 20 may include electrodes and a separator disposed between the electrodes.
- the electrodes include an electrode tab 21t, and the electrode tab 21t may be joined to the electrode lead 40 by a method such as welding. As the electrode lead 40 is exposed to the outside of the pouch-type battery case 30 , the electrode assembly 20 may be electrically connected.
- the electrode assembly 20 may be a stacked electrode assembly in which a plurality of electrodes cut in units of a predetermined size are sequentially stacked with a separator interposed therebetween. All of the electrode tabs 21t extending from the respective electrodes may be bonded to the electrode lead 40 .
- the electrode assembly 20 repeats contraction and expansion as charging and discharging are repeated. As shown in FIG. 2 , the electrode assembly 20 expands in its thickness direction (a direction parallel to the z-axis). Since the electrode lead 40 included in the conventional secondary battery 10 is not flexible and is interposed between the sealed battery cases 30, the position of the electrode tabs 21t can be fixed while the electrode tabs 21t are joined. there is only At this time, when the electrode assembly 20 expands in its thickness direction (a direction parallel to the z-axis), since the electrode lead 40 is fixed, a large tension is generated in the electrode tab 21t. In particular, in the stacked electrode assembly, the outermost electrode tab 21t exerts the greatest tension when the electrode assembly 20 is expanded, and in severe cases, it may lead to disconnection.
- An object of the present invention is to provide a secondary battery capable of reducing the tension applied to an electrode tab and preventing disconnection of the outermost electrode tab even when the electrode assembly expands, and a device including the same .
- a secondary battery includes: an electrode assembly including electrode sheets on which electrode tabs are formed and a separator positioned between the electrode sheets; a battery case in which the electrode assembly is accommodated; and an electrode lead connected to the electrode tab and protruding to the outside of the battery case.
- the electrode lead includes a flexible part having elasticity in a direction parallel to the protruding direction of the electrode lead, and the flexible part is located inside the battery case.
- the flexible part may have a curved shape.
- the flexible portion may extend in a direction parallel to the protruding direction of the electrode lead.
- the flexible part may include at least one of gold (Au) and silver (Ag).
- the battery case may include an upper case and a lower case, the sealing part of the upper case and the sealing part of the lower case may be heat-sealed to each other, and the flexible part may include a portion in which the sealing parts are located among the electrode leads. and the electrode assembly.
- the electrode lead may include: a first part connected to the flexible part and the electrode tab; a second part connected to the flexible part and protruding to the outside of the battery case; and a fixing part connected to each of the first part and the second part.
- the flexible part may include a first flexible part and a second flexible part, and the fixing part may be positioned between the first flexible part and the second flexible part.
- the fixing part may include at least one of a glass material, a ceramic material, carbon (graphite), and an alloy material having low flexibility.
- the fixing part may have a straight shape.
- the electrode assembly may be a stacked electrode assembly in which the electrode sheets are stacked, and when the electrode sheets expand in a thickness direction, the flexible portion may extend in a direction perpendicular to the thickness direction.
- FIG. 1 is a perspective view of a conventional pouch-type secondary battery.
- FIG. 2 is a cross-sectional view taken along the cutting line A-A' of FIG. 1 .
- FIG. 3 is an exploded perspective view of a secondary battery according to an embodiment of the present invention.
- FIG. 4 is a perspective view illustrating a state in which the secondary battery of FIG. 3 is assembled.
- FIG. 5 is a cross-sectional view taken along the cutting line B-B' of FIG.
- FIG. 6 is a plan view of the electrode lead included in the secondary battery of FIG. 5 viewed in the -z-axis direction on the xy plane.
- FIG. 7 is a cross-sectional view illustrating an expanded state of the electrode assembly with respect to the electrode assembly and the electrode lead included in the secondary battery of FIG. 5 .
- FIG. 8 is a cross-sectional view illustrating an electrode assembly and an electrode lead according to a modified embodiment of the present invention.
- FIG. 9 is a plan view of the electrode assembly and the electrode lead of FIG. 8 viewed in the -z-axis direction on the xy plane.
- FIG. 10 is a plan view showing an electrode lead according to another modified embodiment of the present invention.
- a part of a layer, film, region, plate, etc. when a part of a layer, film, region, plate, etc. is said to be “on” or “on” another part, it includes not only cases where it is “directly on” another part, but also cases where there is another part in between. . Conversely, when we say that a part is “just above” another part, we mean that there is no other part in the middle.
- the reference part means to be located above or below the reference part, and to necessarily mean to be located “on” or “on” in the direction opposite to gravity not.
- planar it means when the target part is viewed from above, and "in cross-section” means when viewed from the side when a cross-section of the target part is vertically cut.
- FIG. 3 is an exploded perspective view of a secondary battery according to an embodiment of the present invention.
- 4 is a perspective view illustrating a state in which the secondary battery of FIG. 3 is assembled.
- 5 is a cross-sectional view taken along the cutting line B-B' of FIG.
- a secondary battery 100 includes an electrode assembly 200 , a battery case 300 in which the electrode assembly 200 is accommodated, and a battery case 300 . It includes electrode leads 400 and 500 protruding outward.
- the electrode assembly 200 includes electrode sheets 210 and 220 on which electrode tabs 210t are formed, and a separator 230 positioned between the electrode sheets 210 and 220 .
- the electrode assembly 200 according to the present embodiment may be a stacked electrode assembly, a jelly roll electrode assembly, or a stacked/folding electrode assembly, but is preferably a stacked electrode assembly.
- the stacked electrode assembly may have a structure in which a plurality of electrode sheets 210 and 220 are stacked with a separator 230 interposed therebetween.
- Each of the electrode sheets 210 and 220 may be formed by coating an electrode active material on an electrode current collector, and a portion of the electrode current collector may protrude to provide an electrode tab 210t.
- the electrode sheets 210 and 220 may be divided into a positive electrode sheet and a negative electrode sheet, and a separator 230 may be interposed between the positive electrode sheet and the negative electrode sheet.
- the electrode sheet 210 may be a positive electrode sheet, and the electrode tab 210t protruding therefrom may be a positive electrode tab.
- the other electrode sheet 220 may be a negative electrode sheet, and an electrode tab (not shown) protruding therefrom may be a negative electrode tab.
- the electrode tab according to the present embodiment may be connected to the electrode lead.
- electrode tabs 210t of any one polarity may be bonded to any one electrode lead 400
- electrode tabs (not shown) having a different polarity may be bonded to another electrode lead 500 .
- These electrode leads 400 and 500 may protrude from both ends of the battery case 300 .
- the two electrode leads 400 and 500 protrude in opposite directions in FIGS. 3 and 4
- One of the two electrode leads 400 and 500 may be an anode lead, and the other may be a cathode lead.
- the battery case 300 may be a pouch-type case.
- the battery case 300 may include an upper case 310 and a lower case 320 that are heat-sealed to each other.
- the battery case 300 including the upper case 310 and the lower case 320 may be a laminate sheet including a resin layer and a metal layer.
- each of the upper case 310 and the lower case 320 may include an inner resin layer for sealing, a metal layer preventing material penetration, and an outermost outer resin layer.
- the outer resin layer may have excellent tensile strength and weather resistance compared to its thickness and electrical insulation to protect the pouch-type secondary battery 100 from the outside.
- the outer resin layer may include a polyethylene terephthalate (PET) resin or a nylon resin.
- PET polyethylene terephthalate
- the metal layer may prevent air, moisture, etc. from flowing into the pouch-type secondary battery 100 .
- the metal layer may include aluminum (Al).
- the inner resin layer may be thermally fused to each other by heat and pressure applied in a state in which the electrode assembly 200 is embedded.
- the inner resin layer may include casted polypropylene (CPP) or polypropylene (PP).
- Concave accommodating parts 310R and 320R in which the electrode assembly 200 can be seated may be formed in each of the upper case 310 and the lower case 320 , and the electrode assembly 200 is provided with these accommodating parts 310R. , 320R) can be accommodated.
- Sealing parts 310S and 320S may be provided along the outer periphery of each of the receiving parts 310R and 320R of the upper case 310 and the lower case 320 .
- the sealing part 310S of the upper case 310 and the sealing part 320S of the lower case 320 may be thermally fused to each other, and the battery case 300 may be sealed.
- the inner resin layer of the sealing part 310S of the upper case 310 and the inner resin layer of the sealing part 320S of the lower case 320 may be heat-sealed in a state in which they face each other.
- the upper case 310 and the lower case 320 separated from each other with the receiving part formed it may be a laminate sheet in which one side of the upper case and one side of the lower case are integrally formed, and the upper case and the The lower case may have a plate-shaped structure in which an accommodating part is formed in only one of the lower cases and the accommodating part is not formed in the other one.
- FIG. 6 is a plan view of the electrode lead included in the secondary battery of FIG. 5 viewed in the -z-axis direction on the xy plane.
- the electrode lead 400 according to the present embodiment has a flexible portion ( 400f, flexible part), and the flexible part 400f is located inside the battery case 300 .
- the flexible portion 400f according to the present embodiment has a curved shape, and may extend in a direction parallel to the protrusion direction (a direction parallel to the y-axis) of the electrode lead 400 .
- the flexible portion 400f according to the present embodiment may be compressed in a direction parallel to the protrusion direction (parallel to the y-axis) of the electrode lead 400 .
- the flexible portion 400f is preferably made of a material having excellent ductility, malleability, elasticity, and toughness, and may include, for example, at least one of gold (Au) and silver (Ag).
- This flexible portion 400f may be formed in the middle of the electrode lead 400, specifically, as shown in FIGS. 5 and 6, electrode leads at both ends of the metal material constituting the flexible portion 400f.
- the plate-shaped existing metal material constituting the 400 may be joined by a method such as welding. That is, for example, by welding a metal member including aluminum (Al) or copper (Cu) to both ends of a metal member including silver (Ag), the electrode lead 400 including the flexible portion 400f is formed. can be manufactured.
- FIG. 7 is a cross-sectional view illustrating an expanded state of the electrode assembly with respect to the electrode assembly and the electrode lead included in the secondary battery of FIG. 5 .
- the electrode lead 40 is not flexible, and since the position is fixed, a large tension is generated in the electrode tab 21t according to the expansion of the electrode assembly 20, The outermost electrode tab 21t has a risk of disconnection.
- the electrode assembly 200 moves in the thickness direction (parallel to the z-axis). direction), it can extend in a direction perpendicular to the thickness direction. It may extend in a direction parallel to the axis (a direction parallel to the axis), particularly in a direction in which the electrode assembly 200 is located (the -y-axis direction).
- the flexible portion 400f included in the electrode lead 400 is located inside the battery case 300 .
- the sealing part 310S of the upper case 310 and the sealing part 320S of the lower case 320 are heat-sealed to each other, and the flexible part 400f is the electrode lead 400 ) of the sealing parts 310S and 320S may be located between the portion and the electrode assembly 200 .
- the flexible portion 400f is formed on the outer portion of the electrode lead 400 that is outside the portion where the sealing portions 310S and 320S are located, since it is an outer portion of the portion fixed by the sealing portions 310S and 320S, the electrode When the assembly 200 is expanded, the tension applied to the electrode tab 210t cannot be reduced. Therefore, it is preferable that the flexible portion 400f according to the present embodiment is formed inside the battery case 300 .
- FIG. 8 is a cross-sectional view illustrating an electrode assembly and an electrode lead according to a modified embodiment of the present invention.
- 9 is a plan view of the electrode assembly and the electrode lead of FIG. 8 viewed in the -z-axis direction on the xy plane.
- FIG. 8 corresponds to a cross-section cut along the yz plane, like the cross-section of FIG. 5 or FIG. 7 .
- the formation of the flexible portion 400f ′ on the electrode lead 400 ′ according to the modified embodiment of the present invention is similar to that described above, but the fixing portion 430 is additionally can be formed.
- the electrode lead 400' is connected to the flexible part 400f' and the first part 410 connected to the electrode tab 210t, the flexible part 400f', and is connected to the outside of the battery case. It may include a second portion 420 protruding to the , and a fixing portion 430 connected to each of the first portion 410 and the second portion 420 .
- the flexible portion 400f ′ may include a first flexible portion 400f1 and a second flexible portion 400f2 .
- the first portion 410 may be bonded to one end of each of the first flexible portion 400f1 and the second flexible portion 400f2, and the other of the first flexible portion 400f1 and the second flexible portion 400f2, respectively.
- a second portion 420 may be bonded to the end.
- welding joining may be used as the method of joining.
- the fixing part 430 may be connected to each of the first part 410 and the second part 420 while being positioned between the first flexible part 400f1 and the second flexible part 400f2 .
- the fixing part 430 may also be connected to each of the first part 410 and the second part 420 by welding or the like.
- the fixing part 430 may include at least one of a glass material, a ceramic material, carbon (graphite), and an alloy material having low flexibility. Also, unlike the flexible portion 400f ′ having a serpentine shape, the fixed portion 430 may have a straight shape.
- the flexible part 400f' contains a material having excellent ductility, malleability, elasticity, and toughness, the flexible part 400f' is not fixed in the process of welding the electrode tab 210t to the electrode lead 400'. Therefore, welding may not proceed smoothly. Accordingly, in this embodiment, the fixed part 430 of a straight line was provided to fix the compressed shape of the flexible part 400f'. In addition, since the fixing part 430 can maintain a constant distance between the first part 410 and the second part 420 , the flexible part 400f' is prevented from being expanded even before the electrode assembly 200 is expanded. can do. Instead, since the fixing part 430 according to the present embodiment includes a metal material with somewhat weak strength, it does not interfere with the extension of the flexible part 400f ′ while being broken according to the expansion of the electrode assembly 200 .
- FIG. 10 is a plan view illustrating an electrode lead according to another modified embodiment of the present invention, and specifically shows the modified position of the fixing part 430 .
- the electrode lead 400 ′′ according to the present embodiment may include a first part 410 , a second part 420 , and a fixing part 430 .
- the fixing part 430 according to the present embodiment connects the first part 410 and the second part 420 , there is no particular limitation on the position and number of the fixing part 430 . For example, referring to FIG.
- one flexible part 400f ′′ connected to the first part 410 and the second part 420 is formed, and the two fixing parts 430 are connected to one flexible part ( 400f ′′) may be connected to each of the first portion 410 and the second portion 420 . That is, the two fixing parts 430 may be disposed on both sides of the flexible part 400f ′′ in the x-axis direction.
- the fixing parts 430 shown in FIG. 10 can also fix the compressed shape of the flexible part 400f ′′, and the gap between the first part 410 and the second part 420 before the electrode assembly is expanded. can be kept constant.
- a lead film 600 may be positioned on each of the electrode leads 400 and 500 .
- the lead film 600 may be positioned between the upper case 310 and the lower case 320 in the form of respectively surrounding the electrode leads 400 and 500 .
- the lead film 600 may not only prevent a short circuit from occurring between the electrode leads 400 and 500 and the metal layer of the battery case 300 , but also improve sealing properties of the pouch-type battery case 300 .
- the electrode leads 400 and 500 made of a metal material are heat-sealed to the inner resin layer of the pouch-type battery case 300, the contact resistance is rather high, and surface adhesion may be reduced.
- the lead film 600 may include an insulating material to block the application of current from the electrode leads 400 and 500 to the pouch-type battery case 300 .
- the lead film 600 may be formed of a film having insulation and heat sealing properties.
- the lead film 600 may include, for example, at least one of polyimide (PI), polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET).
- PI polyimide
- PP polypropylene
- PE polyethylene
- PET polyethylene terephthalate
- a plurality of secondary batteries according to the present embodiment described above may be gathered to form a battery module.
- a battery module may be mounted together with various control and protection systems such as a battery management system (BMS) and a cooling system to form a battery pack.
- BMS battery management system
- a cooling system to form a battery pack.
- the secondary battery, the battery module, or the battery pack may be applied to various devices. Specifically, it may be applied to transportation means such as electric bicycles, electric vehicles, hybrids, etc., but is not limited thereto, and may be applied to various devices capable of using a secondary battery.
Abstract
Description
Claims (11)
- 전극탭이 형성된 전극시트들 및 상기 전극시트들 사이에 위치한 분리막을 포함하는 전극 조립체;상기 전극 조립체가 수납되는 전지 케이스; 및상기 전극탭과 연결되고 상기 전지 케이스의 외측으로 돌출되는 전극리드를 포함하고,상기 전극리드는, 상기 전극리드의 돌출 방향과 평행한 방향으로 신축성을 갖는 유연부(Flexible part)를 포함하며,상기 유연부는 상기 전지 케이스의 내부에 위치하는 이차전지.
- 제1항에서,상기 유연부는 굴곡진 형태를 갖는 이차전지.
- 제1항에서,상기 유연부는 상기 전극리드의 돌출 방향과 평행한 방향으로 늘어날 수 있는 이차전지.
- 제1항에서,상기 유연부는 금(Au) 및 은(Ag) 중 적어도 하나를 포함하는 이차전지.
- 제1항에서,상기 전지 케이스는, 상부 케이스 및 하부 케이스를 포함하고,상기 상부 케이스의 실링부와 상기 하부 케이스의 실링부가 서로 열융착하며,상기 유연부는, 상기 전극리드 중 상기 실링부들이 위치한 부분과 상기 전극 조립체 사이에 위치하는 이차전지.
- 제1항에서,상기 전극리드는, 상기 유연부 및 상기 전극탭과 연결된 제1 부분; 상기 유연부와 연결되고 상기 전지 케이스의 외측으로 돌출된 제2 부분; 및 상기 제1 부분과 상기 제2 부분 각각과 연결된 고정부를 포함하는 이차전지.
- 제6항에서,상기 유연부는, 제1 유연부 및 제2 유연부를 포함하고,상기 고정부는 상기 제1 유연부 및 상기 제2 유연부 사이에 위치하는 이차전지.
- 제6항에서,상기 고정부는 유리 소재, 세라믹 소재, 탄소(graphite) 및 낮은 유연성을 갖는 합금 소재 중 적어도 하나를 포함하는 이차전지.
- 제6항에서,상기 고정부는 일직선 형태를 갖는 이차전지.
- 제1항에서,상기 전극 조립체는, 상기 전극시트들이 적층된 스택형 전극 조립체이고,상기 전극시트들이 두께 방향으로 팽창 시 상기 유연부가 상기 두께 방향과 수직한 방향으로 늘어나는 이차전지.
- 제1항에 따른 이차전지를 포함하는 디바이스.
Priority Applications (4)
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US18/036,736 US20230411807A1 (en) | 2020-12-01 | 2021-11-24 | Secondary Battery and Device Including the Same |
EP21900908.1A EP4224621A1 (en) | 2020-12-01 | 2021-11-24 | Secondary battery and device comprising same |
CN202180075639.4A CN116457976A (zh) | 2020-12-01 | 2021-11-24 | 二次电池和包括该二次电池的装置 |
JP2023523636A JP2023546183A (ja) | 2020-12-01 | 2021-11-24 | 二次電池およびそれを含むデバイス |
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KR1020200165723A KR20220076835A (ko) | 2020-12-01 | 2020-12-01 | 이차전지 및 이를 포함하는 디바이스 |
KR10-2020-0165723 | 2020-12-01 |
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US (1) | US20230411807A1 (ko) |
EP (1) | EP4224621A1 (ko) |
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KR (1) | KR20220076835A (ko) |
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WO (1) | WO2022119220A1 (ko) |
Citations (5)
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JPH0574473A (ja) * | 1991-09-17 | 1993-03-26 | Toshiba Corp | 溶融炭酸塩型燃料電池の出力端子装置 |
JP2001229893A (ja) * | 2000-02-18 | 2001-08-24 | Ntk Powerdex Inc | リチウムイオンポリマー電池の安全装置 |
JP2012099311A (ja) * | 2010-11-01 | 2012-05-24 | Denso Corp | 組電池 |
JP2014229435A (ja) * | 2013-05-21 | 2014-12-08 | 日産自動車株式会社 | 積層型電池 |
KR20150000547A (ko) * | 2013-06-24 | 2015-01-05 | 세방전지(주) | 안정성이 향상된 리튬전지의 제조장치 및 그 방법 |
-
2020
- 2020-12-01 KR KR1020200165723A patent/KR20220076835A/ko active Search and Examination
-
2021
- 2021-11-24 US US18/036,736 patent/US20230411807A1/en active Pending
- 2021-11-24 EP EP21900908.1A patent/EP4224621A1/en active Pending
- 2021-11-24 CN CN202180075639.4A patent/CN116457976A/zh active Pending
- 2021-11-24 WO PCT/KR2021/017337 patent/WO2022119220A1/ko active Application Filing
- 2021-11-24 JP JP2023523636A patent/JP2023546183A/ja active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0574473A (ja) * | 1991-09-17 | 1993-03-26 | Toshiba Corp | 溶融炭酸塩型燃料電池の出力端子装置 |
JP2001229893A (ja) * | 2000-02-18 | 2001-08-24 | Ntk Powerdex Inc | リチウムイオンポリマー電池の安全装置 |
JP2012099311A (ja) * | 2010-11-01 | 2012-05-24 | Denso Corp | 組電池 |
JP2014229435A (ja) * | 2013-05-21 | 2014-12-08 | 日産自動車株式会社 | 積層型電池 |
KR20150000547A (ko) * | 2013-06-24 | 2015-01-05 | 세방전지(주) | 안정성이 향상된 리튬전지의 제조장치 및 그 방법 |
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JP2023546183A (ja) | 2023-11-01 |
KR20220076835A (ko) | 2022-06-08 |
EP4224621A1 (en) | 2023-08-09 |
US20230411807A1 (en) | 2023-12-21 |
CN116457976A (zh) | 2023-07-18 |
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