WO2017105114A1 - Patte d'électrode pour pile rechargeable du type sachet et pile rechargeable du type sachet la comprenant - Google Patents

Patte d'électrode pour pile rechargeable du type sachet et pile rechargeable du type sachet la comprenant Download PDF

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Publication number
WO2017105114A1
WO2017105114A1 PCT/KR2016/014748 KR2016014748W WO2017105114A1 WO 2017105114 A1 WO2017105114 A1 WO 2017105114A1 KR 2016014748 W KR2016014748 W KR 2016014748W WO 2017105114 A1 WO2017105114 A1 WO 2017105114A1
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WO
WIPO (PCT)
Prior art keywords
lead
electrode
secondary battery
pouch
lead portion
Prior art date
Application number
PCT/KR2016/014748
Other languages
English (en)
Korean (ko)
Inventor
방인배
김완중
Original Assignee
솔브레인 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 솔브레인 주식회사 filed Critical 솔브레인 주식회사
Priority claimed from KR1020160171479A external-priority patent/KR20170071437A/ko
Publication of WO2017105114A1 publication Critical patent/WO2017105114A1/fr

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Classifications

    • 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
    • H01M10/058—Construction or manufacture
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to an electrode lead used in a pouch type secondary battery and a pouch type secondary battery including the same.
  • a secondary battery is a battery that can be repeatedly charged and discharged, and is widely used in various fields from light weight portable devices such as mobile phones, notebook computers, or cameras to electric vehicles or hybrid vehicles.
  • a type of secondary battery using a non-aqueous electrolyte having a high energy density has a good output, and may be used to drive a motor of an electric vehicle by connecting a plurality of them in series.
  • the secondary battery may be manufactured in various forms, such as a pouch type, a cylindrical shape, or a square shape.
  • a pouch type in the case of the pouch type, its shape is relatively free, light in weight, slim and lightweight, and is widely used for portable devices.
  • the pouch serving as a case in the pouch-type secondary battery has a laminated structure in which a thin film of metal film and an insulating film are attached to both sides thereof, and unlike a cylindrical or square shape formed of a thick metal material, the pouch can be bent freely, and Has a structure including an anode, a cathode, a separator electrolyte and an electrode lead.
  • pouch type secondary batteries are being used as a power source for wearable devices such as smart watches, to meet consumer demand.
  • each member of the pouch-type secondary battery Due to the requirements of the microelectronic device, the size of each member of the pouch-type secondary battery is being developed to meet the miniaturization. However, in the case of an electrode lead, when the size thereof becomes small, a problem may occur in the resistance of the electrode lead.
  • the problem of resistance corresponds to a factor that can cause a large problem in efficiency of the secondary battery, and furthermore, heat generation stability due to resistance. Therefore, there is a need for a study on the electrode lead of the pouch type secondary battery to be miniaturized.
  • the problem to be solved by the present invention is to minimize the portion occupied by the secondary battery in the miniaturized pouch-type secondary battery, while optimizing the space efficiency inside the pouch-type secondary battery according to the miniaturization of the electrode lead,
  • the present invention provides a pouch-type secondary battery electrode lead which has a minimum and improved recovery capacity and lifetime characteristics at high temperature.
  • the present invention provides an electrode lead of a pouch type secondary battery, wherein the electrode lead includes a first lead portion and a second lead portion, and the first lead portion and the second lead portion have the same length and width. Or different, wherein the thickness of the first lead portion is thicker than that of the second lead portion, and the thickness of the first lead portion is 0.5 mm or less.
  • the present invention also provides a secondary battery including a positive electrode, a negative electrode, a separator, and an electrolyte, and is housed in a pouch, including a first lead part protruding out of the pouch, and a second lead part electrically connected to the positive electrode and the negative electrode.
  • the thickness of the first lead part is thicker than that of the second lead part, and the thickness of the first lead part is 0.5 mm or less.
  • the electrode lead for the pouch type secondary battery according to the present invention minimizes the space occupied by the miniaturized pouch type secondary battery by controlling the length, width, and thickness of each lead portion through a double structure of the first lead portion and the second lead portion.
  • the resistance characteristics can be improved.
  • FIG. 1 is a cross-sectional view of a pouch type secondary battery according to an embodiment of the present invention.
  • FIG. 2 is a perspective view of an electrode lead according to an embodiment of the present invention.
  • FIG 3 is a perspective view of an electrode lead according to another exemplary embodiment of the present invention.
  • FIG. 4 is a perspective view of an electrode lead according to another exemplary embodiment of the present invention.
  • FIG. 5 is a perspective view of an electrode lead to which an insulating tape is coupled according to another embodiment of the present invention.
  • an electrode lead is a necessary member.
  • the conventional electrode lead there is no problem of resistance of the electrode lead with a constant thickness of 100 to 400 ⁇ m, and it has been commercialized and used continuously.
  • a battery used in a small electronic device such as a smart watch has to be miniaturized according to the size of the device, each member applied to the secondary battery, and the existing electrode lead is also required to be thin and miniaturized.
  • the electrode lead was produced by making the total thickness of the electrode lead constant at 30 micrometers, the problem of the resistance which did not generate
  • an electrode assembly 10 including an anode 200, a cathode 300, a separator 400, and an electrolyte (not shown) is accommodated in the pouch 500.
  • the electrode lead 100 is electrically connected to the positive electrode 200 and the negative electrode 300, the electrode lead is the first lead portion 101 and the second lead portion And a first lead portion 101 protrudes out of the pouch 500, and the first lead portion 101 and the second lead portion 102 have the same or different lengths and widths.
  • the thickness of the first lead portion 101 is thicker than that of the second lead portion 102, and the thickness of the first lead portion 101 is 0.5 mm or less to provide a pouch type secondary battery 1. .
  • the electrode lead 100 includes a positive electrode tab 201 and a negative electrode tab 301 protruding from the positive electrode 200 and the negative electrode 300 in the electrode assembly 10 accommodated in the pouch 500.
  • the same structure may be applied not only to the coupling structure of the positive electrode tabs and the positive electrode lead, but also to the coupling structure of the negative electrode tabs and the negative electrode lead, so that the present invention will be referred to collectively as the electrode lead 100. .
  • the pouch 500 is formed to a size that can accommodate the electrode assembly 10, the sealing portion is bonded to each other. At this time, the sealing portion of the upper portion of the pouch 501 and the lower portion of the pouch 502 may be made by a method such as heat fusion.
  • the electrode assembly 10 includes an anode 200, a cathode 300, and a separator 400.
  • the electrode assembly 10 may have a positive electrode 200 and a negative electrode 300 sequentially stacked in a state where the separator 400 is interposed therebetween, and may be formed in a stack type or a stack / fold type structure.
  • the positive electrode 200 and the negative electrode 300 include a positive electrode current collector 202 and a negative electrode current collector 302 made of aluminum foil (Al-foil) and copper foil (Cu-foil), respectively.
  • a positive electrode active material (not shown) and a negative electrode active material (not shown) are coated on the positive electrode current collector 202 and the negative electrode current collector 302, respectively.
  • the positive electrode current collector 202 and the negative electrode current collector 302 are insulated from each other by the separator 400.
  • the positive electrode tab 201 and the negative electrode tab 301 extend from the positive electrode 200 and the negative electrode 300 of the electrode assembly 10.
  • the positive electrode tab 201 and the negative electrode tab 301 are not directly exposed to the outside of the pouch 500, but are connected to another component such as the electrode lead 100 so that the electrode lead 100 may be connected to the pouch 500. It can be exposed to the outside.
  • the positive electrode tab 201 and the negative electrode tab 301 and the electrode lead 100 of each of the positive electrode and the negative electrode may be coupled to each other by welding. That is, the positive electrode tab and the positive electrode lead may be coupled to each other by welding, and the negative electrode tab and the negative electrode lead may also be coupled to each other by welding to form a weld (shown in a circle in the drawing).
  • the positive electrode tab 201, the negative electrode tab 301, and the electrode lead 100 may be made of a metallic material, and the coupling between the metallic materials may be easily performed by such a welding method.
  • the present invention is not limited by the specific coupling method of the positive electrode tab 201, the negative electrode tab 301, and the electrode lead 100.
  • the positive electrode tab 201 and the negative electrode tab 301 extending from the positive electrode 200 and the negative electrode 300 each include one or more pieces
  • the electrode lead 100 When using the electrode lead 100 according to an embodiment of the present invention as shown in the circle of Figure 1 it can be optimized to use the space of the weld.
  • the weld corresponds to an element that receives the most electrical resistance by attachment of the electrode tab and the electrode lead.
  • the thickness of the electrode lead 100 is different, and the first lead part 101 is partially exposed to the outside of the pouch 500, and the second lead
  • the unit 102 is electrically connected to the positive electrode tab 201 and the negative electrode tab 301 extending from the negative electrode 300 and the positive electrode 200, and the first lead portion 101 and the second lead portion 102 are electrically connected.
  • the length and width are the same or different, the thickness of the first lead portion 101 is thicker than the second lead portion 102, the thickness of the first lead portion 101 is 0.5mm or less, preferably Preferably, the thickness of the first lead part 101 may be 0.1 mm or less to provide a pouch-type secondary battery, thereby minimizing space utilization and resistance characteristics.
  • the electrode lead 100 for the pouch-type secondary battery includes a first lead part 101 and a second lead part 102, and the first lead part 101 and the second lead. Blowing 102, the length (l) and width (w) is the same or different, the thickness (h) of the first lead portion 101 is thicker than the second lead portion 102, the first lead portion The thickness h of the 101 may be 0.5 mm or less.
  • the length l, width w and thickness h of the electrode lead 100 shown in the present invention can be defined in the directions consisting of the x, y and z axes as shown in FIG.
  • the length l of the first lead portion 101 is set to l '
  • the width w is set to w'
  • the thickness h is set to h '
  • the length l of the second lead portion 102 is divided. Is l ''
  • the width w is w ''
  • the thickness h is h ''.
  • a ratio (l ': l' ') of the length l of the first lead part 101 and the second lead part 102 is from 1: 1.0 to 1.4, and the ratio (w ': w' ') of the width w of the first lead portion 101 and the second lead portion 102 is 1: 0.6 to 1.2, and the first lead portion 101 And the ratio h ': h' 'of the thickness h of the second lead portion 102 may be 1: 0.1 to 0.4.
  • Specific values of the electrode lead 100 according to an embodiment of the present invention may be in the following range.
  • the length l 'of the first lead portion is 10-40 mm
  • the length l' 'of the second lead portion is 10-60 mm
  • the width w' of the first lead portion is 5-20 mm
  • the second lead portion The width w ′′ may be 5-20 mm
  • the thickness h ′ of the first lead part may be 0.1-0.5 mm
  • the thickness h ′′ of the second lead part may be 0.01-0.05 mm.
  • the electrode lead 100 may have a different material according to a cathode and an anode, and may include one or more selected from the group consisting of aluminum, copper, nickel, and nickel plated copper.
  • the electrode lead 100 is formed by integrally forming a metal material including at least one selected from the group consisting of aluminum, copper, nickel, nickel-plated copper, and then crimped or rolled ( It can be produced by molding through a rolling process.
  • electrode leads having various shapes may be formed.
  • the electrode leads may be formed by unidirectional pressing, and in the case of FIG. do. 4 illustrates an embodiment in which the second lead portion is smaller in width and thickness than the first lead portion.
  • the electrode lead 100 further includes an insulating film 103 covering a part of the first lead part 101, and the portion wrapped in the insulating film 103 is a pouch in FIG. 1. It may be located in the sealing portion 500 is formed.
  • the resistance characteristics of the electrode lead according to the exemplary embodiment of the present invention were confirmed through the examples and the comparative examples.
  • the specific experimental environment was measured in a clean room using an AIT slope resistance measuring instrument, and the electrode lead of Example 1 was rolled (rolled) at 500 ° C. at a material made of Cu metal having a thickness of 0.1 mm, a width of 10 mm, and a length of 30 mm. 20mm length was applied to the thickness 0.03mm to make a model as shown in FIG. Since it is processed under pressure, the thickness is thin but the overall density of the electrode leads is the same.
  • the electrode lead of Example 2 was fabricated in the same model as in FIG. 3 by applying a pressure of up to 0.03 mm Cu metal.
  • Example 3 it was produced by the method of rolling (part rolling) in the form of applying a pressure rolling between 400 ⁇ 600 °C.
  • Example 4 it produced by the method similar to the method of 1.
  • the electrode lead was manufactured without undergoing a separate rolling or molding process.
  • An electrode tab including a second lead portion having a length of 10 mm, a width of 10 mm, and a thickness of 0.3 mm and having a ratio shown in Table 2 below was manufactured using the manufacturing method described above.
  • Example 5 10 10 0.3 10 10 0.03 Thickness 1: 0.1 Example 6 10 10 0.3 10 10 0.06 Thickness 1: 0.2 Example 7 10 10 0.3 10 10 0.09 Thickness 1: 0.3 Example 8 10 10 0.3 10 10 0.12 Thickness1: 0.4 Example 9 10 10 0.3 12 10 0.03 Length 1: 1.2 Example 10 10 10 0.3 14 10 0.03 Length 1: 1.4 Example 11 10 10 0.3 10 6 0.03 Width 1: 0.6 Example 12 10 10 0.3 10 12 0.03 Width 1: 1.2 Comparative Example 4 10 10 0.3 10 10 0.3 same
  • NMP solvent N-methyl-2-pyrrolidone
  • the positive electrode mixture slurry was applied to a thin film of aluminum (Al), which is a positive electrode current collector having a thickness of about 20 ⁇ m, dried to prepare a positive electrode, and then subjected to roll press to prepare a positive electrode.
  • a negative electrode mixture slurry was prepared by adding carbon powder as a negative electrode active material, PVdF as a binder, and carbon black as a conductive agent at 96 wt%, 3 wt%, and 1 wt%, respectively, to NMP as a solvent.
  • the negative electrode mixture slurry was applied to a copper (Cu) thin film, which is a negative electrode current collector having a thickness of 10 ⁇ m, dried to prepare a negative electrode, and then roll-rolled to prepare a negative electrode.
  • Cu copper
  • the positive electrode and the negative electrode prepared in this way together with a separator composed of three layers of polypropylene / polyethylene / polypropylene (PP / PE / PP), and electrode tabs were prepared using the electrode tabs of Examples 5 to 12 and Comparative Example 4.
  • the non-aqueous electrolyte prepared by fabricating the pouch-type battery was injected to complete the manufacture of a lithium secondary battery having a capacity of 910 mA.
  • the 910mAh battery produced in Examples 5 to 12 and Comparative Example 4 was charged to 4.2V at 910mA (CC / CV) at room temperature (25 ° C), and then discharged to 2.7V at 910mA (CC) to discharge capacity.
  • CC 910mA
  • the battery was discharged to 2.7V at room temperature and aged for 1 hour, and then charged to 4.2V and discharged to 2.7V to measure the discharge capacity. Compared with the initial measured value.
  • Table 4 The results are shown in Table 4.
  • Example 5 945.3 887.2 847.3 89.6 Thickness 1: 0.1 Example 6 938.3 865.8 840.1 89.5 Thickness 1: 0.2 Example 7 940.6 864.8 842.2 89.5 Thickness 1: 0.3 Example 8 928.1 877.1 827.6 89.2 Thickness1: 0.4 Example 9 927.6 881.8 857.3 92.4 Length 1: 1.2 Example 10 944.7 889.6 859.3 91.0 Length 1: 1.4 Example 11 933.6 871.6 843.7 90.4 Width 1: 0.6 Example 12 944.7 875.1 846.2 89.6 Width 1: 1.2 Comparative Example 4 944.2 861.6 833.2 88.2 same
  • the 910mAh battery manufactured in Examples 5 to 12 and Comparative Example 4 was charged at 1820mA (CC / CV) to 4.2V at a high temperature (45 ° C) and then had a 10 minute rest (rest) time and 1820mA (CC). After discharging up to 2.7V, a method of having a 10 minute rest period was repeated 300 times to compare the capacity (mAh) and the efficiency (%) of the measured value with the initial value of 300 times. The results are shown in Table 5.
  • Example 5 911.9 832.2 91.3 Thickness 1: 0.1 Example 6 913.8 816.9 89.4 Thickness 1: 0.2 Example 7 916.7 814.4 88.9 Thickness 1: 0.3 Example 8 913.5 816.4 89.4 Thickness1: 0.4 Example 9 914.5 836.2 91.4 Length 1: 1.2 Example 10 915.6 812.9 88.8 Length 1: 1.4 Example 11 908.5 827.5 91.9 Width 1: 0.6 Example 12 914.5 824.8 90.7 Width 1: 1.2 Comparative Example 4 909.4 795.8 87.5 same

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention concerne une patte d'électrode pour pile rechargeable du type sachet, la patte d'électrode comprenant une première partie de patte et une seconde partie de patte, la première partie de patte et la seconde partie de patte présentent des longueurs et des largeurs identiques ou différentes; l'épaisseur de la première partie de patte étant supérieure à l'épaisseur de la seconde partie de patte; et l'épaisseur de la première partie de patte étant inférieure ou égale à 0,5 mm.
PCT/KR2016/014748 2015-12-15 2016-12-15 Patte d'électrode pour pile rechargeable du type sachet et pile rechargeable du type sachet la comprenant WO2017105114A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20150179489 2015-12-15
KR10-2015-0179489 2015-12-15
KR10-2016-0171479 2016-12-15
KR1020160171479A KR20170071437A (ko) 2015-12-15 2016-12-15 파우치형 이차전지용 전극 리드 및 이를 포함하는 파우치형 이차전지

Publications (1)

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WO2017105114A1 true WO2017105114A1 (fr) 2017-06-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001210303A (ja) * 2000-01-28 2001-08-03 Yuasa Corp 電池用電極群
JP2004087260A (ja) * 2002-08-26 2004-03-18 Nissan Motor Co Ltd 積層型電池、組電池、電池モジュール並びに電気自動車
KR100546878B1 (ko) * 2004-07-02 2006-01-26 주식회사 엘티케이 2차 전지용 전극탭 부착체의 제조방법 및 장치
KR100846074B1 (ko) * 2005-05-09 2008-07-14 주식회사 엘지화학 파우치형 전지의 입체형 전극단자
KR20140068562A (ko) * 2012-11-28 2014-06-09 주식회사 엘지화학 전극탭의 구조가 개선된 이차전지 및 그 전극탭

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001210303A (ja) * 2000-01-28 2001-08-03 Yuasa Corp 電池用電極群
JP2004087260A (ja) * 2002-08-26 2004-03-18 Nissan Motor Co Ltd 積層型電池、組電池、電池モジュール並びに電気自動車
KR100546878B1 (ko) * 2004-07-02 2006-01-26 주식회사 엘티케이 2차 전지용 전극탭 부착체의 제조방법 및 장치
KR100846074B1 (ko) * 2005-05-09 2008-07-14 주식회사 엘지화학 파우치형 전지의 입체형 전극단자
KR20140068562A (ko) * 2012-11-28 2014-06-09 주식회사 엘지화학 전극탭의 구조가 개선된 이차전지 및 그 전극탭

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