WO2022270837A1 - 전극탭과 메탈 리드의 접합방법 및 리튬 이차 전지 - Google Patents
전극탭과 메탈 리드의 접합방법 및 리튬 이차 전지 Download PDFInfo
- Publication number
- WO2022270837A1 WO2022270837A1 PCT/KR2022/008683 KR2022008683W WO2022270837A1 WO 2022270837 A1 WO2022270837 A1 WO 2022270837A1 KR 2022008683 W KR2022008683 W KR 2022008683W WO 2022270837 A1 WO2022270837 A1 WO 2022270837A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode tab
- metal lead
- lithium
- lithium electrode
- secondary battery
- Prior art date
Links
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Images
Classifications
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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 a bonding method between an electrode tab and a metal lead and a lithium secondary battery.
- lithium secondary batteries capable of charging and discharging, and furthermore, lithium secondary batteries has become a focus of interest. Recently, in developing such batteries, in order to improve capacity density and specific energy, a new electrode Research and development on battery design is being actively conducted.
- a lithium metal battery being developed as a next-generation battery has an anode made only of lithium.
- lithium has a low melting point compared to other metals, is brittle and easily broken, and is potentially explosive when exposed to air, making it difficult to develop into a battery.
- bonding the lithium electrode tab of the lithium negative electrode and the metal lead is known to be a very difficult task due to the brittle nature of the lithium electrode tab.
- FIG. 1 a technique of bonding the metal lead and the lithium electrode tab by pressing them in a laminated state is used.
- this method since the nature of the lithium electrode tab is brittle, it is difficult to control the joint strength and the joint size because the degree of spreading of the lithium electrode tab is different depending on the amount of pressing pressure and the pressing time. That is, the shape of the outer circumferential portion of the lithium electrode tab is formed differently for each operation, and the ends of the outer circumferential portion are also jagged, making it difficult to form a junction in a uniform shape. In addition, it is also difficult to uniformly form the thickness of the lithium electrode tab and the area of the junction.
- the conventional method as described above has a disadvantage in that the production efficiency of the battery is low because lithium sticks to the pressurizing device that presses the lithium electrode tab, causing bonding defects, and thus increasing the time required for the bonding process.
- the present invention was made to solve the above problems of the prior art,
- a lithium secondary battery including an electrode bonding structure of a lithium electrode tab and a metal lead,
- a lithium secondary battery characterized in that both side surfaces in the longitudinal direction of the lithium electrode tab bonded to the metal lead are molded into a plane.
- the bonding method of the lithium electrode tab and the metal lead of the present invention uniformly forms the shape of the outer circumference of the lithium electrode tab, uniformly forms the thickness of the lithium electrode tab, and reliably controls the bonding area, so that the lithium electrode It is possible to easily adjust the joint strength and joint size between the tab and the metal lead.
- the bonding method of the electrode tab and the metal lead of the present invention significantly improves process efficiency, provides an effect of minimizing bonding defects, and provides an effect of minimizing resistance deviation between cells.
- the lithium secondary battery of the present invention includes a bonding structure between a lithium electrode tab and a metal lead having excellent bonding strength, it provides improved quality.
- FIG. 1 is a perspective view schematically showing a conventional method of bonding a lithium electrode tab and a metal lead;
- FIGS. 2 and 3 are perspective views schematically showing an embodiment of a method of bonding a lithium electrode tab and a metal lead according to the present invention
- FIG. 4 is a perspective view schematically showing an embodiment of a molding mold used in the method of bonding a lithium electrode tab and a metal lead according to the present invention
- FIG. 5 is a diagram schematically showing a bonding mechanism of a method of bonding a lithium electrode tab and a metal lead according to the present invention.
- the nature of the lithium electrode tab is brittle, it is difficult to control the joint strength and the joint size because the degree of spreading of the lithium electrode tab is different depending on the amount of pressing pressure and the pressing time. That is, the shape of the outer circumferential portion of the lithium electrode tab is formed differently for each operation, and the ends of the outer circumferential portion are also jagged, making it difficult to form a junction in a uniform shape. In addition, it is also difficult to uniformly form the thickness of the lithium electrode tab and the area of the junction.
- the junction between the lithium electrode tab and the metal lead formed by this method has a problem in that the thickness and area are not constant, resulting in a large resistance deviation between cells. If the junction area is insufficient, the junction is easily broken, resulting in many defects during cell assembly. did
- lithium sticks to the pressurizing device for pressurizing the lithium electrode tab, resulting in bonding failure, and also increases the time required for the bonding process, thereby reducing the production efficiency of the battery.
- the present invention is characterized in that the joint strength and the joint size are easily adjusted by bonding the lithium electrode tab 22 and the metal lead 30 using the molding mold 10 . That is, in the bonding method of the present invention, by using the mold 10, the shape of the outer circumference of the lithium electrode tab 22 can be uniformly formed into the shape of the mold groove 12 formed in the mold 10, In addition, it is possible to reliably adjust the junction area between the lithium electrode tab and the metal lead due to this effect. In addition, the thickness of the lithium electrode tab 22 can be formed uniformly by the action of the forming mold 10 . That is, since the wall forming the molding groove 12 in the mold 10 functions as a stopper when pressurized, even if the pressure on the metal lead 30 is not finely adjusted when pressurized, the thickness of the electrode tab 22 can be formed uniformly.
- the lithium electrode tab 22 does not directly contact the pressurizing device, but only contacts the molding groove 12 of the mold, there is a problem in that bonding failure occurs due to lithium sticking to the pressurizing device. It does not occur, and the problem of lengthening the time required for the bonding process due to lithium sticking to the pressurization device also provides an effect that does not occur.
- the molding groove 12 of step (a) is formed at the front end of the molding mold 10 in the direction of the metal lead 30, as shown in FIGS. 2 and 4 (a). It may be formed in a continuous form to the distal end.
- This type of forming groove 12 is preferable because it is possible to uniformly control the shape of both side surfaces of the lithium electrode tab 22 in the longitudinal direction.
- the molding groove 12 of the step (a) is a rectangular groove with one side open.
- the open side may be located on the side of the electrode 20 coupled with the lithium electrode tab 22 .
- Molding grooves 12 of this type are preferable because it is possible to uniformly control the shape of both side surfaces of the lithium electrode tab 22 in the longitudinal direction as well as the distal end.
- the molding groove 12 may have a width of 0.5 to 1 time compared to the width of the metal lead 30 .
- the width of the molding groove is larger than that of the metal lead, a portion of the lithium electrode tab 22 that is not joined to the metal lead 30 may be formed during bonding, and a portion where the metal lead 30 does not exist when pressurized. This is undesirable because the lithium electrode tab 22 may rise and cause a resistance deviation between cells.
- the depth of the molding groove 12 is smaller than the thickness of the lithium electrode tab 22 . This is because when the metal lead 30 is pressed to bond the metal lead 30 and the lithium electrode tab 22, the thickness of the lithium electrode tab 22, which has a soft property, becomes thinner and spreads in the lateral direction. In order to uniformly form the thickness of the electrode tab 22, as shown in FIG. This is because it is necessary to act as a stopper to stop it.
- the molding groove 12 is formed wider than the width of the lithium electrode tab 22 . This is because, since the lithium electrode tab 22 is stretched in the transverse direction when pressing in the thickness direction, a space capable of accommodating the stretched portion must exist in the molding groove.
- a step of welding the lithium electrode tab and the metal lead may be further included after step (d).
- the welding step is not necessarily a required step. That is, since the metal lead and the lithium electrode tab can be bonded without welding through various bonding structures, the welding step can be selectively performed.
- a release agent is applied to the molding groove 12, or , The step of covering the release film may be further included.
- FIG. 5 The bonding mechanism of the bonding method of the lithium electrode tab and the metal lead of the present invention is illustrated in FIG. 5 .
- Figure 5 (a) shows cross-sections of the lithium electrode tab 22 and the metal lead 30 in the width direction (transverse direction) before bonding and after bonding.
- the brittle lithium electrode tab 22 expands in the transverse direction. While being molded in the form of the molding groove 12, it is bonded to the metal lead 30 at the same time.
- FIG. 5(b) shows cut sections in the length direction (longitudinal direction) of the lithium electrode tab 22 and the metal lead 30 divided into before bonding and after bonding.
- the lithium electrode tab 22 having a brittle property ( As shown in a), at the same time as expanding in the transverse direction, as shown in (b), the thickness is reduced while being molded in the form of a molding groove 12. In addition, it is bonded to the metal lead 30 by this mechanism.
- FIG. 5(c) shows the deformation behavior of the lithium electrode tab 22 due to pressurization from the upper direction of the lithium electrode tab 22 .
- the brittle lithium electrode tab 22 expands in the transverse direction. While being molded in the form of a molding groove (12).
- the present invention also relates to the present invention.
- a lithium secondary battery including a laminated junction structure of a lithium electrode tab and a metal lead,
- It relates to a lithium secondary battery in which both side surfaces of the lithium electrode tab bonded to the metal lead in the longitudinal direction are flat.
- the plane may be a surface formed by a molding mold.
- the contents described in the bonding method of the electrode tab and the metal lead may be equally applied to the lithium secondary battery. Therefore, the contents overlapping with the above contents are omitted.
- the end surface of the metal lead direction of the lithium electrode tab bonded to the metal lead may be formed in a flat shape.
- the uniform surface may be a surface molded by a molding mold.
- upper and lower surfaces of the lithium electrode tab bonded to the metal lead may be molded into a plane having a uniform thickness.
- upper and lower surfaces of the lithium electrode tab bonded to the metal lead may be molded into a plane having a uniform thickness.
- a lithium electrode tab 22 having a step and a metal lead 30 are laminated at the lower end of the step. It may include a bonded form in a state of being.
- a lithium electrode tab 22 having a step and a metal lead 30 are laminated at the lower end of the step. It may include a form in which the lithium electrode tab 22 is bonded, and the surface opposite to the stacking of the metal lead 30 of the lithium electrode tab 22 may also include a form in which a step is included.
- It may be formed by stacking one end of the metal lead 30 on top of the lithium electrode tab 22 and pressing the top of the stacked metal lead 30 .
- the end surface of the metal lead bonded to the lithium electrode tab 22 may be bonded to the stepped surface of the lithium electrode tab without a gap to form a laminated bonding structure.
- the meaning of no gap means practically no gap.
- the lithium secondary battery may include a free-standing lithium electrode.
- the lithium secondary battery may be manufactured by including a negative electrode and a positive electrode that are free-standing lithium electrodes, an electrolyte interposed between the negative electrode and the positive electrode, and a separator.
- the lithium secondary battery of the present invention may be manufactured by a known method by a configuration known in the art, except for the junction structure between the lithium electrode tab and the metal lead.
- a configuration known in the art except for the junction structure between the lithium electrode tab and the metal lead.
- the positive electrode included in the lithium secondary battery of the present invention may include a positive electrode active material, a binder, and a conductive material.
- the binder is a component that assists in the bonding of the positive electrode active material and the conductive material and the bonding to the current collector, for example, polyvinylidene fluoride (PVdF), polyvinylidene fluoride-polyhexafluoropropylene copolymer (PVdF/ HFP), polyvinyl acetate, polyvinyl alcohol, polyvinyl ether, polyethylene, polyethylene oxide, alkylated polyethylene oxide, polypropylene, polymethyl (meth) acrylate, polyethyl (meth) acrylate, polytetrafluoroethylene (PTFE) ), polyvinyl chloride, polyacrylonitrile, polyvinylpyridine, polyvinylpyrrolidone, styrene-butadiene rubber, acrylonitrile-butadiene rubber,
- the binder may be added in an amount of 1 to 50 parts by weight, preferably 3 to 15 parts by weight, based on 100 parts by weight of the total weight of the positive electrode.
- the conductive material included in the positive electrode is not particularly limited as long as it does not cause side reactions in the internal environment of the lithium secondary battery and does not cause chemical change in the battery and has excellent electrical conductivity.
- graphite or conductive carbon may be used. and, for example, graphite such as natural graphite and artificial graphite; carbon black such as carbon black, acetylene black, ketjen black, denka black, thermal black, channel black, furnace black, lamp black, and summer black; a carbon-based material whose crystal structure is graphene or graphite; conductive fibers such as carbon fibers and metal fibers; fluorinated carbon; metal powders such as aluminum and nickel powder; conductive whiskeys such as zinc oxide and potassium titanate; conductive oxides such as titanium oxide; And conductive polymers such as polyphenylene derivatives; may be used alone or in combination of two or more, but are not necessarily limited thereto.
- the conductive material may be added in an amount of 0.5 to 50 parts by weight, preferably 1 to 30 parts by weight, based on 100 parts by weight of the total weight of the positive electrode.
- the positive electrode of the present invention can be manufactured by dispersing and mixing the positive electrode active material, binder, and conductive material in a dispersion medium (solvent) to form a slurry, applying the slurry on a positive electrode current collector, and then drying and rolling.
- a dispersion medium solvent
- NMP N-methyl-2-pyrrolidone
- DMF dimethyl formamide
- DMSO dimethyl sulfoxide
- ethanol isopropanol
- water and mixtures thereof
- the positive current collector includes platinum (Pt), gold (Au), palladium (Pd), iridium (Ir), silver (Ag), ruthenium (Ru), nickel (Ni), stainless steel (STS), aluminum (Al ), molybdenum (Mo), chromium (Cr), carbon (C), titanium (Ti), tungsten (W), ITO (In doped SnO 2 ), FTO (F doped SnO 2 ), and alloys thereof , carbon (C), nickel (Ni), titanium (Ti), or silver (Ag) surface-treated on the surface of aluminum (Al) or stainless steel, etc. may be used, but is not necessarily limited thereto.
- the shape of the positive electrode current collector may be in the form of a foil, film, sheet, punched one, porous body, foam or the like.
- the separator is interposed between the positive electrode and the negative electrode to prevent a short circuit therebetween and to provide a passage for lithium ions.
- olefinic polymers such as polyethylene and polypropylene, glass fibers, and the like may be used in the form of sheets, multilayers, microporous films, woven fabrics and nonwovens, but are not necessarily limited thereto.
- a solid electrolyte such as a polymer (eg, organic solid electrolyte, inorganic solid electrolyte, etc.) is used as the electrolyte, the solid electrolyte may also serve as a separator.
- a solid electrolyte or a liquid electrolyte may be used as the electrolyte, and a non-aqueous electrolyte (non-aqueous organic solvent) may be used as the liquid electrolyte, for example.
- a non-aqueous electrolyte non-aqueous organic solvent
- carbonate, ester, ether, or ketone may be used alone or in combination of two or more, but is not necessarily limited thereto.
- Lithium salt may be further added to the electrolyte and used (so-called non-aqueous electrolyte containing lithium salt), and the lithium salt may be a known material that is easily soluble in non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF3SO3, LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiPF 3 (CF 2 CF 3 ) 3 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, 4 phenyl borate lithium, imide, and the like, but are not necessarily limited thereto.
- the lithium secondary battery of the present invention may be manufactured according to a conventional method in the art. For example, it can be prepared by inserting a porous separator between an anode and a cathode and injecting a non-aqueous electrolyte.
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Abstract
Description
Claims (14)
- (a) 리튬 전극탭 성형틀을 준비하는 단계;(b) 상기 성형틀의 성형홈에 리튬 전극탭 일단부를 위치시키는 단계;(c) 상기 성형홈에 위치된 리튬 전극탭 상부에 메탈 리드의 일단부를 적층시키는 단계; 및(d) 상기 적층된 메탈 리드 상부를 가압하는 단계;를 포함하는 리튬 전극탭과 메탈 리드의 접합방법.
- 제1항에 있어서,상기 (a) 단계의 성형홈은 성형틀의 메탈 리드 방향 선단부에서 말단부까지 연속된 형태로 형성되는 것을 특징으로 하는 리튬 전극탭과 메탈 리드의 접합방법.
- 제1항에 있어서,상기 (a) 단계의 성형홈은 사각형 홈에서 한 변이 오픈된 형태이며, 상기 오픈된 한 변이 리튬 전극탭과 결합된 전극 쪽에 위치하는 것을 특징으로 하는 전극탭과 메탈 리드의 접합방법.
- 제2항 또는 제3항에 있어서,상기 성형홈은 메탈 리드의 폭과 대비하여 0.5 내지 1 배의 너비를 갖는 것을 특징으로 하는 전극탭과 메탈 리드의 접합방법.
- 제1항에 있어서,상기 (d) 단계 후에 리튬 전극탭과 메탈 리드를 용접시키는 단계를 더 포함하는 것을 특징으로 하는 전극탭과 메탈 리드의 접합방법.
- 제1항에 있어서,상기 (b) 단계 전에 상기 성형홈에 이형제를 도포하거나, 이형필름을 덮는 단계를 더 포함 것을 특징으로 하는 전극탭과 메탈 리드의 접합방법.
- 리튬 전극탭과 메탈 리드의 적층 접합 구조를 포함하는 리튬 이차 전지로서,상기 메탈 리드와 접합된 리튬 전극탭의 길이 방향 양쪽 측면이 평면으로 성형된 것을 특징으로 하는 리튬 이차 전지.
- 제7항에 있어서,상기 적층 접합 구조는 단차가 형성된 리튬 전극탭과 상기 단차의 아랫 단에 메탈 리드가 적층된 상태로 접합된 형태를 포함하는 것을 특징으로 하는 리튬 이차 전지.
- 제8항에 있어서,상기 리튬 전극탭의 메탈 리드 적층 반대면도 단차를 포함하는 것을 특징으로 하는 리튬 이차 전지.
- 제8항 또는 제9항에 있어서,상기 단차는 리튬 전극탭 성형틀의 성형홈에 리튬 전극탭 일단부를 위치시키고, 상기 리튬 전극탭 상부에 메탈 리드의 일단부를 적층시키고, 상기 적층된 메탈 리드 상부를 가압하는 과정에 의해 형성된 것을 특징으로 하는 리튬 이차 전지.
- 제8항에 있어서,상기에서 리튬 전극탭에 접합된 메탈 리드 말단면은 리튬 전극탭의 단차 형성면과 틈이 없이 접합된 형태인 것을 특징으로 하는 리튬 이차 전지.
- 제7항에 있어서,상기 메탈 리드와 접합된 리튬 전극탭의 메탈 리드 방향 말단면이 평면으로 성형된 리튬 이차 전지.
- 제7항에 있어서,상기 메탈 리드와 접합된 리튬 전극탭의 상부면과 하부면이 균일한 두께의 평면으로 성형된 리튬 이차 전지.
- 제7항에 있어서,상기 리튬 이차 전지는 프리스탠딩 리튬 전극을 포함하는 것을 특징으로 하는 리튬 이차 전지.
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JP2023539904A JP2024501340A (ja) | 2021-06-21 | 2022-06-20 | 電極タップとメタルリードの接合方法及びリチウム二次電池 |
US18/281,952 US20240162578A1 (en) | 2021-06-21 | 2022-06-20 | Method for bonding electrode tab and metal lead, and lithium secondary battery |
CN202280010372.5A CN116783770A (zh) | 2021-06-21 | 2022-06-20 | 用于将电极接线片和金属引线结合的方法以及锂二次电池 |
EP22828684.5A EP4243192A1 (en) | 2021-06-21 | 2022-06-20 | Method for bonding electrode tab and metal lead, and lithium secondary battery |
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2022
- 2022-06-20 WO PCT/KR2022/008683 patent/WO2022270837A1/ko active Application Filing
- 2022-06-20 CN CN202280010372.5A patent/CN116783770A/zh active Pending
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- 2022-06-20 JP JP2023539904A patent/JP2024501340A/ja active Pending
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KR20200039923A (ko) * | 2018-10-08 | 2020-04-17 | 주식회사 엘지화학 | 리튬 이차전지의 음극 탭 접합 방법, 이를 적용하여 제조된 리튬 이차전지용 음극 및 이를 포함하는 리튬 이차전지 |
KR20210079944A (ko) | 2019-12-20 | 2021-06-30 | 한국생산기술연구원 | 섬유형 수압센서, 이를 포함하는 기능성 의류 및 이를 이용한 조난신호 제공방법 |
KR20220074655A (ko) | 2020-11-27 | 2022-06-03 | (주)케이알터빈에너지 | 증기터빈장치 |
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KR20220169918A (ko) | 2022-12-28 |
CN116783770A (zh) | 2023-09-19 |
JP2024501340A (ja) | 2024-01-11 |
EP4243192A1 (en) | 2023-09-13 |
US20240162578A1 (en) | 2024-05-16 |
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