WO2018084514A1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
WO2018084514A1
WO2018084514A1 PCT/KR2017/012073 KR2017012073W WO2018084514A1 WO 2018084514 A1 WO2018084514 A1 WO 2018084514A1 KR 2017012073 W KR2017012073 W KR 2017012073W WO 2018084514 A1 WO2018084514 A1 WO 2018084514A1
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WO
WIPO (PCT)
Prior art keywords
terminal
secondary battery
tabs
plain
cap plate
Prior art date
Application number
PCT/KR2017/012073
Other languages
French (fr)
Korean (ko)
Inventor
이혜정
Original Assignee
삼성에스디아이 주식회사
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Publication date
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Publication of WO2018084514A1 publication Critical patent/WO2018084514A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • 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
    • H01M50/543—Terminals
    • 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
    • H01M10/04—Construction or manufacture in general
    • 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 of a single cell or a single battery
    • 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 of a single cell or a single battery
    • H01M50/147—Lids or covers
    • 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
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • 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 disclosure relates to a secondary battery, and more particularly, to a secondary battery that connects tabless tabs to an electrode terminal.
  • a rechargeable battery is a battery that repeatedly performs charging and discharging, unlike a primary battery.
  • Small capacity secondary batteries can be used in portable electronic devices such as mobile phones, notebook computers and camcorders, and large capacity secondary batteries can be used as power sources for driving motors of hybrid vehicles and electric vehicles.
  • the secondary battery includes an electrode assembly for charging and discharging, a case accommodating the electrode assembly, a cap plate coupled to the opening of the case, and an electrode terminal electrically connected to the electrode assembly and drawn out of the cap plate. do.
  • the electrode assembly adopts a plurality of plain tabs or a plurality of electrodes to realize high power, and improves utilization of the internal space by arranging negative and positive tabs in the same direction.
  • the electrode assembly further uses an integrated tab to connect the plain tabs connected to the electrodes to an external electrode terminal.
  • an additional component, the integrated tab occupies internal space, hindering the implementation of the high power and high capacity of the secondary battery.
  • One embodiment of the present invention to provide a secondary battery in connecting the plain tabs of the electrode assembly to the electrode terminal, reducing the number of parts and optimizing the connection structure to increase the utilization of the internal space.
  • One embodiment of the present invention to provide a secondary battery that implements high output and high capacity by increasing the utilization of the internal space.
  • a secondary battery includes an electrode assembly formed by disposing an electrode having a coating portion and a tab portion on both sides of a separator, a case accommodating the electrode assembly, and a terminal hole coupled to an opening of the case.
  • An electrode configured to form a cap space having an outer side of the cap plate and connected to the terminal hole and electrically connecting the plain tabs through the terminal hole to the inside of the terminal space. It includes a terminal.
  • the electrode terminal may be connected to the plain tabs by welding to the inner surface of the terminal space.
  • the electrode terminal may include a first planar portion corresponding to an upper end of the plain tabs, and a first side portion bent from an outer side of the first planar portion to correspond to side surfaces of the plain tabs.
  • the first side portion may be electrically connected to the plain tabs as a recess facing the side surfaces of the plain tabs.
  • the first side portion may be electrically connected to the plain tabs as a first protrusion facing the side surfaces of the plain tabs.
  • the uncoated tabs may be welded to a current collector, and the electrode terminal may be welded to the current collector by an inner surface of the terminal space.
  • the current collecting member may include a second planar portion corresponding to an upper end of the plain tabs, and a second side portion bent at both ends of the second planar portion to correspond to side surfaces of the plain tabs.
  • the second side portion may be electrically connected to the plain tabs with a second depression toward the plain tabs in an intermediate portion thereof with respect to the length direction of the plain tab.
  • the second side portion may be electrically connected to the plain tabs with a second protrusion toward the plain tabs at a lower end thereof in a length direction of the plain tab.
  • the electrode terminal includes a first planar part corresponding to the second planar part of the current collecting member, and a first side part that is bent at an outer side of the first planar part to correspond to the second planar part, and the first side part is The first recessed portion facing the second side portion may be electrically connected to the second side portion.
  • the electrode terminal includes a first planar part corresponding to the second planar part of the current collecting member, and a first side part that is bent at an outer side of the first planar part to correspond to the second planar part, and the first side part is The first protrusion toward the second side portion may be electrically connected to the second side portion.
  • the electrode terminal may include a first planar part corresponding to the second planar part of the current collecting member, and a first side part that is bent at an outer side of the first planar part to correspond to the second planar part, and the first planar part An opening may be formed and connected to the second flat portion by welding.
  • the electrode terminal may include a first planar part corresponding to the second planar part of the current collecting member, and a first side part that is bent at an outer side of the first planar part to correspond to the second planar part, and the first planar part By forming an opening, the second flat portion may be welded by being joined to the opening by a protrusion.
  • the electrode terminal is electrically insulated from the cap plate via a gasket in the first terminal hole of the cap plate and is connected to a negative electrode of the electrode assembly, and an outer side of the second terminal hole of the cap plate. It may include a positive terminal which is electrically connected to the cap plate and connected to the positive electrode of the electrode assembly.
  • the negative electrode terminal protrudes to the outside of the first terminal hole, forms the terminal space, and is electrically connected to the uncoated tab of the negative electrode inside the terminal space. It may be supported on the inner surface of the cap plate via the gasket with a flange extending in the planar direction of the cap plate from the inside.
  • the anode terminal protrudes to the outside of the second terminal hole, integral with the cap plate or welded to the cap plate, form the terminal space, and may be electrically connected to the uncoated tab of the anode inside the terminal space.
  • the terminal space is formed inside the electrode terminal, and the plain tabs of the electrode assembly are electrically connected to the electrode terminal in the terminal space via the terminal hole of the cap plate.
  • the number of parts connecting the terminal and the electrode terminal can be reduced and the connection structure can be optimized. Therefore, the utilization of the internal space in the secondary battery can be increased, thereby enabling high power and high capacity.
  • FIG. 1 is a perspective view of a rechargeable battery according to a first exemplary embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.
  • FIG. 3 is a perspective view of an electrode assembly applied to FIG. 2.
  • FIG. 4 is a perspective view of a top insulator assembled to the electrode assembly of FIG. 3 and a current collector separated.
  • FIG. 5 is a cross-sectional view taken along the line VV of FIG. 1.
  • FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 1.
  • FIG. 7 is a cross-sectional view of the negative terminal of the secondary battery according to the second embodiment of the present invention.
  • FIG. 8 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a second exemplary embodiment of the present invention.
  • FIG. 9 is a cross-sectional view of the negative terminal of the secondary battery according to the third embodiment of the present invention.
  • FIG. 10 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a third exemplary embodiment of the present invention.
  • FIG. 11 is a cross-sectional view of the negative terminal of the secondary battery according to the fourth embodiment of the present invention.
  • FIG. 12 is a cross-sectional view of the negative terminal of the secondary battery according to the fifth embodiment of the present invention.
  • FIG. 13 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a sixth exemplary embodiment of the present invention.
  • FIG. 14 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a seventh exemplary embodiment of the present invention.
  • FIG. 1 is a perspective view of a rechargeable battery according to a first exemplary embodiment of the present invention
  • FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1.
  • the secondary battery 1 of the first embodiment includes an electrode assembly 10 for charging and discharging a current, a case 30 containing an electrode assembly 10 and an electrolyte, and a case 30.
  • a cap plate 40 coupled to the opening 31 of the cap 31 to seal the opening 31, and electrode terminals 51 and 52 electrically connected to the electrode assembly 10 and installed on the cap plate 40; "Negative and positive terminal").
  • the secondary battery 1 further includes a top insulator 20 formed of an electrical insulating material.
  • the top insulator 20 is disposed between the inner surface of the cap plate 40 and the electrode assembly 10 to electrically insulate the inner surface of the cap plate 40 and the electrode assembly 10.
  • the case 30 sets a space to accommodate the plate-shaped electrode assembly 10 and the electrolyte solution.
  • the case 30 is formed in a substantially rectangular parallelepiped, and has a rectangular opening 31 at one side thereof to insert the electrode assembly 10.
  • the case 30 and the cap plate 40 may be formed of aluminum to be bonded to each other in the opening 31 to be welded.
  • the cap plate 40 further includes a vent hole 41 and an electrolyte injection hole 42 as well as first and second terminal holes H1 and H2 on which the positive and negative terminals 51 and 52 are installed.
  • the vent hole 41 is sealed by the vent plate 411 so as to discharge the internal pressure caused by the gas generated inside the secondary battery 1 by the charging and discharging action of the electrode assembly 10.
  • Vent plate 411 has a notch 412 leading to an incision.
  • the electrolyte injection hole 42 couples the cap plate 40 to the case 30 to weld the electrolyte, and then injects the electrolyte into the cap plate 40 and the case 30. After electrolyte injection, the electrolyte injection port 42 is sealed with a sealing stopper 421.
  • the top insulator 20 has an internal vent hole 27 and an internal electrolyte injection hole 28. Since the inner vent hole 27 is formed to correspond to the vent hole 41 provided in the cap plate 40, the inner vent hole 27 is smoothly transferred to the vent hole 41 by the gas generated by the gas generated in the electrode assembly 10. To be discharged.
  • the electrolyte through the electrolyte injection hole 42 may be smoothly injected into the top insulator 20.
  • FIG. 3 is a perspective view of the electrode assembly applied to FIG. 2
  • FIG. 4 is a perspective view of a top insulator assembled to the electrode assembly of FIG. 3 and a current collector member separated. 2 to 4, the electrode assembly 10 is formed by disposing electrodes 11 and 12 (eg, “cathodes and anodes”) on both sides of the separator 13, which is an electrical insulation material.
  • electrodes 11 and 12 eg, “cathodes and anodes”
  • the cathode 11, the separator 13, and the anode 12 may be wound.
  • the cathode, the separator, and the anode may be stacked to form an electrode assembly.
  • the positive electrodes 11 and 12 are formed of coatings 111 and 121 coated with active materials on current collectors of metal foils (for example, Cu and Al foils), and current collectors exposed by not applying active materials. And non-stick tabs 112 and 122.
  • the plain tabs 112 and 122 are disposed at one end of the wound electrode assembly 10, and are disposed at a distance D within the single winding range WD of the electrode assembly 10.
  • the plain tabs 112 of the negative electrode 11 are disposed at one side (left side of FIG. 3) at one end (the top of FIG. 3) of the electrode assembly 10 to be wound, and the plain tabs of the positive electrode 12 ( 122 is disposed on the other side (right side of FIG. 3) at a distance D from the uncoated tabs 112 of the negative electrode 11 at the same end (top of FIG. 3) of the electrode assembly 10 to be wound.
  • the tabs 112 and 122 are provided for each winding of the electrode assembly 10 to flow a current to be charged and discharged, the overall resistance of the tabs 112 and 122 is reduced. Therefore, the electrode assembly 10 may charge and discharge a high current through the plain tabs 112 and 122.
  • the electrode assembly 10 is formed of two assemblies. Although not shown, the electrode assembly may be formed of one, three, or four (not shown). That is, the electrode assembly 10 includes a first assembly 101 and a second assembly 102 that are arranged side by side in the width direction (x-axis direction) of the cap plate 40.
  • first and second assemblies 101 and 102 may be formed in a plate shape to form semicircles at both ends of the y-axis direction so as to be accommodated in the case 30 having a substantially rectangular parallelepiped shape.
  • the positive and negative terminals 51 and 52 are disposed outside the cap plate 40 corresponding to the first and second terminal holes H1 and H2 of the cap plate 40, respectively, and have a terminal space ( 510 and 520, which are electrically connected to the plain tabs 112 and 122.
  • the non-coated tabs 112 and 122 connect the first and second assemblies 101 and 102 to the negative and positive terminal 51 and 52.
  • the tabless tabs 112 and 122 may be formed in a plurality of groups.
  • the uncoated tabs 112 and 122 are electrically connected to the terminal spaces 510 and 520 of the negative and positive terminals 51 and 52 via the first and second terminal holes H1 and H2 of the cap plate 40. Are connected to each other.
  • the non-coating tabs 112 and 122 include first tap groups G11 and G21 and second tap groups G12 and G22.
  • the first tap groups G11 and G21 are connected to the negative and positive electrodes 11 and 12 of the first assembly 101 and electrically connected to the negative and positive terminal 51 and 52, respectively.
  • the second tap group G12 and G22 are connected to the negative and positive electrodes 11 and 12 of the second assembly 102 and electrically connected to the negative and positive terminal 51 and 52, respectively.
  • the top insulator 20 further includes tab outlets 201 and 202.
  • the tab outlets 201 and 202 pass through the plain tabs 112 and 122 connected to the electrode assembly 10 so that the plain tabs 112 and 122 pass through the first and second terminal holes H1 and H2.
  • the inside of the terminal spaces 510 and 520 may be squeezed into the negative and positive terminals 51 and 52.
  • the positive and negative terminals 51 and 52 may include the first flat portions 511 and 521 corresponding to the upper ends of the plain tabs 112 and 122, and the first flat portions 511 and 511.
  • the first side portions 512 and 522 which are bent at the outer side of the 521 and correspond to the side surfaces of the plain tabs 112 and 122 are included.
  • the anode terminals 51 and 52 are formed in a substantially rectangular parallelepiped having an internal space.
  • the negative electrode terminal 51 protrudes to the outside of the first terminal hole H1, forms the terminal space 510, and has a negative electrode inside the terminal space 510.
  • 11 is electrically connected to the tab tab 112 of the uncoated portion, and is installed in the cap plate 40 in an electrically insulated state.
  • the negative electrode terminal 51 is supported on the inner surface of the cap plate 40 via a gasket 631 with a flange 513 extending in the planar direction of the cap plate 40 from the inside.
  • the anode terminal 52 protrudes to the outside of the second terminal hole H2, is integrally formed with the cap plate 40, or welded to the cap plate 40, and the terminal space. 520 is formed and is electrically connected to the uncoated tab 122 of the anode 12 in the terminal space 520.
  • the tabs 112 and 122 are welded to the current collecting members 71 and 72, and the negative and positive terminals 51 and 52 are connected to the terminal spaces 510 and 520. It is connected to the current collector members 71 and 72 by welding. In other words, the tabs 112 and 122 are electrically connected to the negative and positive electrode terminals 51 and 52 in the terminal spaces 510 and 520 through the current collectors 71 and 72.
  • the current collecting members 71 and 72 are bent at both ends of the second flat portions 711 and 721 and the second flat portions 711 and 721 corresponding to the upper ends of the non-coating tabs 112 and 122, respectively. Second side portions 712, 722 corresponding to the side surfaces 112, 122.
  • the positive terminals 51 and 52 are electrically connected to the second side parts 712 and 722 of the current collecting members 71 and 72 by the first side parts 512 and 522.
  • the second side portions 712 and 722 of the current collecting members 71 and 72 have a second recess 713 facing the plain tabs 112 and 122 at an intermediate portion with respect to the length direction of the plain tabs 112 and 122. 723, is electrically connected to the plain tabs 112, 122.
  • the second recesses 713 and 723 strengthen the mechanical and electrical connection of the current collecting members 71 and 72 and the plain tabs 112 and 122.
  • the secondary battery 1 of the first embodiment connects the tabs 112 and 122 of the electrode assembly 10 to the current collecting members 71 and 72, and connects the current collecting members 71 and 72 to the negative and positive electrodes. Since the direct connection to the terminals 51 and 52 connects the plain tabs 112 and 122 to the negative and positive terminals 51 and 52, the number of parts can be reduced and the connection structure can be optimized. Therefore, the utilization of the internal space in the secondary battery 1 can be increased.
  • FIG. 7 is a cross-sectional view of the negative terminal of the secondary battery according to the second embodiment of the present invention
  • FIG. 8 is a cross-sectional view of the positive electrode terminal of the secondary battery according to the second embodiment of the present invention.
  • the secondary battery 2 according to the second embodiment does not use the current collector members 71 and 72 as compared to the secondary battery 1 of the first embodiment.
  • negative and positive electrode terminals 53 and 54 are directly connected by welding to the tabs 112 and 122 to the inner surface of the terminal spaces 530 and 540.
  • the secondary battery 2 of the second embodiment directly connects the tabs 112 and 122 of the electrode assembly 10 to the negative and positive terminals 53 and 54, thereby connecting the tabs 112 and 122.
  • the utilization of the internal space in the secondary battery 2 may be higher.
  • the first side portions 532 and 542 of the positive electrode terminals 53 and 54 are the first tab portions 533 and 543 facing the sides of the plain tabs 112 and 122, and the plain tabs 112 are formed. , 122).
  • the first recesses 533 and 543 strengthen the mechanical and electrical connection of the negative and positive terminals 53 and 54 and the tabs 112 and 122.
  • FIG. 9 is a cross-sectional view of the negative terminal of the secondary battery according to the third embodiment of the present invention
  • FIG. 10 is a cross-sectional view of the positive electrode terminal of the secondary battery according to the third embodiment of the present invention.
  • the second side portions 732 and 742 of the current collecting members 73 and 74 are formed in the length direction z of the plain tabs 112 and 122. Axial direction), the second protrusions 733 and 743 facing the plain tabs 112 and 122 at the lower portion thereof are electrically connected to the plain tabs 112 and 122.
  • the second protrusions 733 and 743 strengthen the mechanical and electrical connection of the current collecting members 73 and 74 and the plain tabs 112 and 122.
  • the first side portions 552 and 562 of the positive electrode terminals 55 and 56 are first recessed portions 553 and 563 facing the second side portions 732 and 742 of the current collecting members 73 and 74, respectively. And electrically connected to 732 and 742.
  • the first recesses 553 and 563 reinforce mechanical and electrical connections between the negative and positive terminals 55 and 56 and the current collecting members 73 and 74.
  • FIG. 11 is a cross-sectional view of the negative terminal of the secondary battery according to the fourth embodiment of the present invention.
  • the secondary battery 4 of the fourth embodiment has been described as an example of the negative electrode terminal 57 for convenience.
  • the first side portion 572 of the negative electrode terminal 57 is electrically connected to the plain tabs 112 by a first protrusion 573 facing the side of the plain tabs 112.
  • the first protrusion 573 strengthens the mechanical and electrical connection between the negative electrode terminal 57 and the plain tabs 112.
  • the negative electrode terminal 57 having the first protrusion 573 is connected to the plain tabs 112 by the first protrusion 573 facing the side of the non-coating tabs 112.
  • the negative electrode terminal 57 having the first protrusion 573 is provided with current collectors 71 and 72 having recesses 713 and 723 of the first embodiment (FIGS. 5 and 6). May also apply.
  • FIG. 12 is a cross-sectional view of the negative terminal of the secondary battery according to the fifth embodiment of the present invention.
  • the secondary battery 5 of the fifth embodiment has been described using the negative electrode terminal 67 as an example.
  • the second side surface portion 732 of the current collecting member 73 may have the plain tabs at the bottom portion in the longitudinal direction (z-axis direction) of the plain tab 112.
  • a second protrusion 733 facing the 112 is electrically connected to the plain tabs 112. The second protrusion 733 strengthens the mechanical and electrical connection of the current collecting member 73 and the plain tabs 112.
  • the first side portion 672 of the negative electrode terminal 67 is electrically connected to the second side portion 732 by a first protrusion 673 facing the second side portion 732 of the current collecting member 73.
  • the first protrusion 673 strengthens the mechanical and electrical connection between the negative electrode terminal 67 and the current collector member 73.
  • the negative electrode terminal 67 having the first protrusion 673 includes a second protrusion 733 at a lower end thereof with respect to the longitudinal direction (z-axis direction) of the tabs 112. It is applied to the current collector member 73.
  • the negative electrode terminal 67 having the first protrusion 673 is provided with current collectors 71 and 72 having depressions 713 and 723 of the first embodiment (FIGS. 5 and 6). May also apply.
  • FIG. 13 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a sixth exemplary embodiment of the present invention.
  • FIG. 13 the secondary battery 6 of the sixth embodiment has been described with the positive electrode terminal 58 as an example.
  • the second side surface portion 732 of the current collecting member 73 is plain at the bottom portion with respect to the longitudinal direction (z-axis direction) of the plain tab 112.
  • a second protrusion 733 facing the sub tabs 112 is electrically connected to the plain tabs 112.
  • the second protrusion 733 strengthens the mechanical and electrical connection of the current collecting member 73 and the plain tabs 112.
  • the first planar portion 581 of the positive electrode terminal 58 forms an opening 584, and is connected to the second planar portion 731 of the current collecting member 73 by welding (W). Since the first flat portion 581 of the positive electrode terminal 58 and the second flat portion 731 of the current collecting member 73 are welded to each other through the opening 584, the mechanical properties of the positive electrode terminal 58 and the current collecting member 73 are welded to each other. And electrical connection is enhanced.
  • the negative electrode terminal 58 having the first opening 584 has a structure welded to the current collector member 73.
  • the negative electrode terminal 58 having the first opening 584 includes the current collecting members 71 and 72 (see FIGS. 5 and 6) of the first embodiment and the current collecting member of the third embodiment ( 73, 74 (see FIGS. 9 and 10).
  • FIG. 14 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a seventh exemplary embodiment of the present invention.
  • the secondary battery 7 according to the seventh embodiment has been described using the negative electrode terminal 68 as an example.
  • the second side surface portion 732 of the current collecting member 73 is plain at the lower portion with respect to the longitudinal direction (z-axis direction) of the plain tab 122.
  • a second protrusion 733 facing the sub tabs 122 is electrically connected to the plain tabs 122.
  • the second protrusion 733 reinforces the mechanical and electrical connection of the current collecting member 73 and the plain tabs 122.
  • the first flat portion 681 of the positive electrode terminal 68 forms an opening 684, and the second flat portion 751 of the current collecting member 75 is joined to the opening 684 by a protrusion 754 to be welded. W). Since the first flat portion 681 of the positive electrode terminal 68 and the second flat portion 751 of the current collecting member 75 are welded to each other through the opening 684, the positive electrode terminal 68 and the current collecting member 75 are welded. The mechanical and electrical connection of the is further strengthened.
  • the negative electrode terminal 68 having the first opening 684 is coupled to and welded to the current collecting member 75 having the protrusion 754.
  • the negative electrode terminal 68 having the first opening 684 in the seventh embodiment includes the current collecting members 71 and 72 (see FIGS. 5 and 6) of the first embodiment and the current collecting member of the third embodiment ( 73, 74 (see FIGS. 9 and 10).
  • cathode 12 anode
  • cap plate 41 vent hole
  • vent plate 412 notch
  • sealing stopper 510, 520, 530, 540 terminal space
  • first plane portion 513 flange
  • G11, G21 first tap group
  • G12, G22 second tap group
  • H1, H2 First and second terminal holes W: Welding

Abstract

One embodiment of the present invention provides a secondary battery in which the number of component parts is reduced and a connection structure is optimized in the connecting of uncoated portion taps of an electrode assembly to an electrode terminal, such that utilization of an internal space is increased. The secondary battery according to one embodiment of the present invention comprises: the electrode assembly formed by arranging electrodes, which have coated portion and uncoated portion taps, at both sides of a separator; a case for accommodating the electrode assembly; a cap plate coupled to an opening of the case and having a terminal hole; and an electrode terminal arranged outside the cap plate, having a terminal space formed therein and connected to the terminal hole, and electrically connecting, inside the terminal space, the uncoated portion taps passing through the terminal hole.

Description

이차 전지Secondary battery
본 기재는 이차 전지에 관한 것으로서, 보다 상세하게는 무지부 탭들을 전극단자에 연결하는 이차 전지에 관한 것이다.The present disclosure relates to a secondary battery, and more particularly, to a secondary battery that connects tabless tabs to an electrode terminal.
이차 전지(rechargeable battery)는 일차 전지와 달리 충전 및 방전을 반복적으로 수행하는 전지이다. 소용량의 이차 전지는 휴대폰이나 노트북 컴퓨터 및 캠코더와 같이 휴대가 가능한 소형 전자기기에 사용되고, 대용량 이차 전지는 하이브리드 자동차 및 전기 자동차의 모터 구동용 전원으로 사용될 수 있다.A rechargeable battery is a battery that repeatedly performs charging and discharging, unlike a primary battery. Small capacity secondary batteries can be used in portable electronic devices such as mobile phones, notebook computers and camcorders, and large capacity secondary batteries can be used as power sources for driving motors of hybrid vehicles and electric vehicles.
예를 들면, 이차 전지는 충전 및 방전 작용하는 전극 조립체, 전극 조립체를 수용하는 케이스, 케이스의 개구에 결합되는 캡 플레이트, 및 전극 조립체를 전기적으로 연결하여 캡 플레이트의 외측으로 인출하는 전극단자를 포함한다.For example, the secondary battery includes an electrode assembly for charging and discharging, a case accommodating the electrode assembly, a cap plate coupled to the opening of the case, and an electrode terminal electrically connected to the electrode assembly and drawn out of the cap plate. do.
전극 조립체는 복수의 무지부 탭들이나 복수의 전극들을 채택하여 고출력을 구현하며, 음, 양극의 무지부 탭들을 동일 방향으로 배치하여 내부공간의 활용도를 향상시킨다.The electrode assembly adopts a plurality of plain tabs or a plurality of electrodes to realize high power, and improves utilization of the internal space by arranging negative and positive tabs in the same direction.
그러나 전극 조립체는 전극들에 연결되는 무지부 탭들을 외부의 전극단자에 연결하기 위하여 통합 탭을 추가로 사용한다. 따라서 추가 부품인 통합 탭은 내부공간을 차지하여 이차 전지의 고출력 및 고용량 구현을 저해한다.However, the electrode assembly further uses an integrated tab to connect the plain tabs connected to the electrodes to an external electrode terminal. Thus, an additional component, the integrated tab, occupies internal space, hindering the implementation of the high power and high capacity of the secondary battery.
본 발명의 일 실시예는 전극 조립체의 무지부 탭들을 전극단자에 연결하는 데 있어서, 부품의 개수를 줄이고 연결 구조를 최적화 하여 내부공간의 활용도를 높이는 이차 전지를 제공하는 것이다.One embodiment of the present invention to provide a secondary battery in connecting the plain tabs of the electrode assembly to the electrode terminal, reducing the number of parts and optimizing the connection structure to increase the utilization of the internal space.
본 발명의 일 실시예는 내부공간의 활용도를 높여서 고출력 및 고용량을 구현하는 이차 전지를 제공하는 것이다.One embodiment of the present invention to provide a secondary battery that implements high output and high capacity by increasing the utilization of the internal space.
본 발명의 일 실시예에 따른 이차 전지는, 코팅부와 무지부 탭들을 가지는 전극을 세퍼레이터의 양측에 배치하여 형성되는 전극 조립체, 상기 전극 조립체를 수용하는 케이스, 상기 케이스의 개구에 결합되고 단자홀을 구비하는 캡 플레이트, 및 상기 캡 플레이트의 외측에 배치되고 상기 단자홀에 연결되는 단자 공간을 내부에 형성하며 상기 단자홀을 경유하는 상기 무지부 탭들을 상기 단자 공간의 내부에서 전기적으로 연결하는 전극단자를 포함한다.According to an embodiment of the present invention, a secondary battery includes an electrode assembly formed by disposing an electrode having a coating portion and a tab portion on both sides of a separator, a case accommodating the electrode assembly, and a terminal hole coupled to an opening of the case. An electrode configured to form a cap space having an outer side of the cap plate and connected to the terminal hole and electrically connecting the plain tabs through the terminal hole to the inside of the terminal space. It includes a terminal.
상기 전극단자는 상기 단자 공간의 내면으로 상기 무지부 탭들에 용접으로 연결될 수 있다.The electrode terminal may be connected to the plain tabs by welding to the inner surface of the terminal space.
상기 전극단자는 상기 무지부 탭들의 상단에 대응하는 제1평면부, 및 상기 제1평면부의 외곽에서 절곡되어 상기 무지부 탭들의 측면에 대응하는 제1측면부를 포함할 수 있다.The electrode terminal may include a first planar portion corresponding to an upper end of the plain tabs, and a first side portion bent from an outer side of the first planar portion to correspond to side surfaces of the plain tabs.
상기 제1측면부는 상기 무지부 탭들의 측면을 향하는 함몰부로 상기 무지부 탭들에 전기적으로 연결될 수 있다.The first side portion may be electrically connected to the plain tabs as a recess facing the side surfaces of the plain tabs.
상기 제1측면부는 상기 무지부 탭들의 측면을 향하는 제1돌출부로 상기 무지부 탭들에 전기적으로 연결될 수 있다.The first side portion may be electrically connected to the plain tabs as a first protrusion facing the side surfaces of the plain tabs.
상기 무지부 탭들은 집전부재에 용접되고, 상기 전극단자는 상기 단자 공간의 내면으로 상기 집전부재에 용접으로 연결될 수 있다.The uncoated tabs may be welded to a current collector, and the electrode terminal may be welded to the current collector by an inner surface of the terminal space.
상기 집전부재는 상기 무지부 탭들의 상단에 대응하는 제2평면부, 및 상기 제2평면부의 양단에서 절곡되어 상기 무지부 탭들의 측면에 대응하는 제2측면부를 포함할 수 있다.The current collecting member may include a second planar portion corresponding to an upper end of the plain tabs, and a second side portion bent at both ends of the second planar portion to correspond to side surfaces of the plain tabs.
상기 제2측면부는 상기 무지부 탭의 길이 방향에 대하여, 중간 부분에서 상기 무지부 탭들을 향하는 제2함몰부로 상기 무지부 탭들에 전기적으로 연결될 수 있다.The second side portion may be electrically connected to the plain tabs with a second depression toward the plain tabs in an intermediate portion thereof with respect to the length direction of the plain tab.
상기 제2측면부는 상기 무지부 탭의 길이 방향에 대하여, 하단 부분에서 상기 무지부 탭들을 향하는 제2돌출부로 상기 무지부 탭들에 전기적으로 연결될 수 있다.The second side portion may be electrically connected to the plain tabs with a second protrusion toward the plain tabs at a lower end thereof in a length direction of the plain tab.
상기 전극단자는 상기 집전부재의 제2평면부에 대응하는 제1평면부, 및 상기 제1평면부의 외곽에서 절곡되어 상기 제2평면부에 대응하는 제1측면부를 포함하며, 상기 제1측면부는 상기 제2측면부를 향하는 제1함몰부로 상기 제2측면부에 전기적으로 연결될 수 있다.The electrode terminal includes a first planar part corresponding to the second planar part of the current collecting member, and a first side part that is bent at an outer side of the first planar part to correspond to the second planar part, and the first side part is The first recessed portion facing the second side portion may be electrically connected to the second side portion.
상기 전극단자는 상기 집전부재의 제2평면부에 대응하는 제1평면부, 및 상기 제1평면부의 외곽에서 절곡되어 상기 제2평면부에 대응하는 제1측면부를 포함하며, 상기 제1측면부는 상기 제2측면부를 향하는 제1돌출부로 상기 제2측면부에 전기적으로 연결될 수 있다.The electrode terminal includes a first planar part corresponding to the second planar part of the current collecting member, and a first side part that is bent at an outer side of the first planar part to correspond to the second planar part, and the first side part is The first protrusion toward the second side portion may be electrically connected to the second side portion.
상기 전극단자는 상기 집전부재의 제2평면부에 대응하는 제1평면부, 및 상기 제1평면부의 외곽에서 절곡되어 상기 제2평면부에 대응하는 제1측면부를 포함하며, 상기 제1평면부는 개구를 형성하여 상기 제2평면부에 용접으로 연결될 수 있다.The electrode terminal may include a first planar part corresponding to the second planar part of the current collecting member, and a first side part that is bent at an outer side of the first planar part to correspond to the second planar part, and the first planar part An opening may be formed and connected to the second flat portion by welding.
상기 전극단자는 상기 집전부재의 제2평면부에 대응하는 제1평면부, 및 상기 제1평면부의 외곽에서 절곡되어 상기 제2평면부에 대응하는 제1측면부를 포함하며, 상기 제1평면부는 개구를 형성하여 상기 제2평면부는 상기 개구에 돌기로 결합되어 용접될 수 있다.The electrode terminal may include a first planar part corresponding to the second planar part of the current collecting member, and a first side part that is bent at an outer side of the first planar part to correspond to the second planar part, and the first planar part By forming an opening, the second flat portion may be welded by being joined to the opening by a protrusion.
상기 전극단자는 상기 캡 플레이트의 제1단자홀에 개스킷을 개재하여 상기 캡 플레이트와 전기적으로 절연 상태로 설치되고 상기 전극 조립체의 음극에 연결되는 음극단자, 및 상기 캡 플레이트의 제2단자홀의 외측에 구비되어 상기 캡 플레이트에 전기적으로 연결되고 상기 전극 조립체의 양극에 연결되는 양극단자를 포함할 수 있다.The electrode terminal is electrically insulated from the cap plate via a gasket in the first terminal hole of the cap plate and is connected to a negative electrode of the electrode assembly, and an outer side of the second terminal hole of the cap plate. It may include a positive terminal which is electrically connected to the cap plate and connected to the positive electrode of the electrode assembly.
상기 음극단자는 상기 제1단자홀의 외부로 돌출되고, 상기 단자 공간을 형성하며, 상기 단자 공간의 내부에서 상기 음극의 무지부 탭에 전기적으로 연결되고. 내측에서 상기 캡 플레이트의 평면 방향으로 확장되는 플랜지로 상기 개스킷을 개재하여 상기 캡 플레이트의 내면에 지지될 수 있다.The negative electrode terminal protrudes to the outside of the first terminal hole, forms the terminal space, and is electrically connected to the uncoated tab of the negative electrode inside the terminal space. It may be supported on the inner surface of the cap plate via the gasket with a flange extending in the planar direction of the cap plate from the inside.
상기 양극단자는 상기 제2단자홀의 외부로 돌출되고, 상기 캡 플레이트와 일체 또는 상기 캡 플레이트에 용접되며, 상기 단자 공간을 형성하고, 상기 단자 공간의 내부에서 상기 양극의 무지부 탭에 전기적으로 연결될 수 있다.The anode terminal protrudes to the outside of the second terminal hole, integral with the cap plate or welded to the cap plate, form the terminal space, and may be electrically connected to the uncoated tab of the anode inside the terminal space. have.
이와 같이 본 발명의 일 실시예에 따르면, 전극단자의 내부에 단자 공간이 형성되고, 전극 조립체의 무지부 탭들이 캡 플레이트의 단자홀을 경유하여 단자 공간에서 전극단자와 전기적으로 연결되므로 무지부 탭들과 전극단자를 연결하는 부품의 개수가 줄어들고 연결 구조가 최적화 될 수 있다. 따라서 이차 전지에서 내부공간의 활용도가 높아질 수 있고, 이로 인하여, 고출력 및 고용량의 구현이 가능해진다.As described above, according to the exemplary embodiment of the present invention, the terminal space is formed inside the electrode terminal, and the plain tabs of the electrode assembly are electrically connected to the electrode terminal in the terminal space via the terminal hole of the cap plate. The number of parts connecting the terminal and the electrode terminal can be reduced and the connection structure can be optimized. Therefore, the utilization of the internal space in the secondary battery can be increased, thereby enabling high power and high capacity.
도 1은 본 발명의 제1실시예에 따른 이차 전지의 사시도이다.1 is a perspective view of a rechargeable battery according to a first exemplary embodiment of the present invention.
도 2는 도 1의 Ⅱ-Ⅱ 선을 따라 자른 단면도이다.FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.
도 3는 도 2에 적용된 전극 조립체의 사시도이다.3 is a perspective view of an electrode assembly applied to FIG. 2.
도 4은 도 3의 전극 조립체에 탑 인슐레이터를 조립하고 집전부재를 분리한 상태의 사시도이다.FIG. 4 is a perspective view of a top insulator assembled to the electrode assembly of FIG. 3 and a current collector separated.
도 5은 도 1의 Ⅴ-Ⅴ 선을 따라 자른 단면도이다.FIG. 5 is a cross-sectional view taken along the line VV of FIG. 1.
도 6은 도 1의 Ⅵ-Ⅵ 선을 따라 자른 단면도이다.6 is a cross-sectional view taken along the line VI-VI of FIG. 1.
도 7은 본 발명의 제2실시예에 따른 이차 전지에서 음극단자 측을 절단한 단면도이다.7 is a cross-sectional view of the negative terminal of the secondary battery according to the second embodiment of the present invention.
도 8은 본 발명의 제2실시예에 따른 이차 전지에서 양극단자 측을 절단한 단면도이다.8 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a second exemplary embodiment of the present invention.
도 9는 본 발명의 제3실시예에 따른 이차 전지에서 음극단자 측을 절단한 단면도이다.9 is a cross-sectional view of the negative terminal of the secondary battery according to the third embodiment of the present invention.
도 10은 본 발명의 제3실시예에 따른 이차 전지에서 양극단자 측을 절단한 단면도이다.10 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a third exemplary embodiment of the present invention.
도 11은 본 발명의 제4실시예에 따른 이차 전지에서 음극단자 측을 절단한 단면도이다.11 is a cross-sectional view of the negative terminal of the secondary battery according to the fourth embodiment of the present invention.
도 12는 본 발명의 제5실시예에 따른 이차 전지에서 음극단자 측을 절단한 단면도이다.12 is a cross-sectional view of the negative terminal of the secondary battery according to the fifth embodiment of the present invention.
도 13은 본 발명의 제6실시예에 따른 이차 전지에서 양극단자 측을 절단한 단면도이다.FIG. 13 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a sixth exemplary embodiment of the present invention. FIG.
도 14는 본 발명의 제7실시예에 따른 이차 전지에서 양극단자 측을 절단한 단면도이다.14 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a seventh exemplary embodiment of the present invention.
이하, 첨부한 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.
도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서는 동일한 참조부호를 붙였다.In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.
명세서 전체에서, 어떤 부분이 다른 부분과 "연결"되어 있다고 할 때, 이는 "직접적으로 연결"되어 있는 경우뿐 만 아니라, 다른 부재를 사이에 두고 "간접적으로 연결"된 것도 포함한다. 또한, 어떤 부분이 어떤 구성요소를 "포함"한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 포함할 수 있는 것을 의미한다.Throughout the specification, when a part is "connected" to another part, it includes not only "directly connected", but also "indirectly connected" between other members. In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.
명세서 전체에서 층, 막, 영역, 판 등의 부분이 다른 부분 "~위에" 또는 "~상에" 있다고 할 때 이는 다른 부분의 "바로 위에" 있는 경우뿐 아니라 그 중간에 다른 부분이 있는 경우도 포함한다. 그리고 "~위에" 또는 "~상에" 라 함은 대상 부분의 위 또는 아래에 위치하는 것을 의미하며, 반드시 중력 방향을 기준으로 상측에 위치하는 것을 의미하지 않는다.When a part of a layer, a film, an area, a plate, etc. in the specification is said to be "on" or "on" another part, it is not only when it is "right on" the other part but also when there is another part in the middle. Include. And "on" or "on" means to be located above or below the target portion, and does not necessarily mean to be located above the gravity direction.
도 1은 본 발명의 제1실시예에 따른 이차 전지의 사시도이고, 도 2는 도 1의 Ⅱ-Ⅱ 선을 따라 자른 단면도이다. 도 1 및 도 2를 참조하면, 제1실시예의 이차 전지(1)는 전류를 충전 및 방전하는 전극 조립체(10), 전극 조립체(10)와 전해액을 내장하는 케이스(30), 케이스(30)의 개구(31)에 결합되어 개구(31)를 밀폐하는 캡 플레이트(40), 및 전극 조립체(10)에 전기적으로 연결되어 캡 플레이트(40)에 설치되는 전극단자(51, 52; 일례로써, "음, 양극단자"라 함) 를 포함한다.1 is a perspective view of a rechargeable battery according to a first exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1. 1 and 2, the secondary battery 1 of the first embodiment includes an electrode assembly 10 for charging and discharging a current, a case 30 containing an electrode assembly 10 and an electrolyte, and a case 30. A cap plate 40 coupled to the opening 31 of the cap 31 to seal the opening 31, and electrode terminals 51 and 52 electrically connected to the electrode assembly 10 and installed on the cap plate 40; "Negative and positive terminal").
또한, 이차 전지(1)는 전기 절연재로 형성되는 탑 인슐레이터(20)를 더 포함한다. 탑 인슐레이터(20)는 캡 플레이트(40)의 내면과 전극 조립체(10) 사이에 배치되어 캡 플레이트(40)의 내면과 전극 조립체(10)를 전기적으로 절연한다.In addition, the secondary battery 1 further includes a top insulator 20 formed of an electrical insulating material. The top insulator 20 is disposed between the inner surface of the cap plate 40 and the electrode assembly 10 to electrically insulate the inner surface of the cap plate 40 and the electrode assembly 10.
케이스(30)는 플레이트 모양의 전극 조립체(10)와 전해액을 수용할 수 있도록 공간을 설정한다. 예를 들면, 케이스(30)는 대략 직육면체로 형성되고, 전극 조립체(10)를 삽입하도록 그 일측에 사각형의 개구(31)를 구비한다. 일례로써, 케이스(30)와 캡 플레이트(40)는 알루미늄으로 형성되어 개구(31)에서 서로 결합되어 용접될 수 있다.The case 30 sets a space to accommodate the plate-shaped electrode assembly 10 and the electrolyte solution. For example, the case 30 is formed in a substantially rectangular parallelepiped, and has a rectangular opening 31 at one side thereof to insert the electrode assembly 10. As an example, the case 30 and the cap plate 40 may be formed of aluminum to be bonded to each other in the opening 31 to be welded.
캡 플레이트(40)는 음, 양극단자(51, 52)가 설치되는 제1, 제2단자홀(H1, H2)뿐만 아니라 벤트홀(41)과 전해액 주입구(42)를 더 구비한다. 벤트홀(41)은 전극 조립체(10)의 충전 및 방전 작용에 의하여 이차 전지(1)의 내부에서 발생되는 가스에 의한 내부 압력을 배출할 수 있도록 벤트 플레이트(411)로 밀폐된다. 벤트 플레이트(411)는 절개를 유도하는 노치(412)를 가진다.The cap plate 40 further includes a vent hole 41 and an electrolyte injection hole 42 as well as first and second terminal holes H1 and H2 on which the positive and negative terminals 51 and 52 are installed. The vent hole 41 is sealed by the vent plate 411 so as to discharge the internal pressure caused by the gas generated inside the secondary battery 1 by the charging and discharging action of the electrode assembly 10. Vent plate 411 has a notch 412 leading to an incision.
전해액 주입구(42)는 케이스(30)에 캡 플레이트(40)를 결합하여 용접한 후, 캡 플레이트(40) 및 케이스(30)의 내부로 전해액을 주입할 수 있게 한다. 전해액 주입 후, 전해액 주입구(42)는 밀봉 마개(421)로 밀봉된다.The electrolyte injection hole 42 couples the cap plate 40 to the case 30 to weld the electrolyte, and then injects the electrolyte into the cap plate 40 and the case 30. After electrolyte injection, the electrolyte injection port 42 is sealed with a sealing stopper 421.
탑 인슐레이터(20)는 내부 벤트홀(27)과 내부 전해액 주입구(28)를 구비한다. 내부 벤트홀(27)은 캡 플레이트(40)에 구비되는 벤트홀(41)에 대응하여 형성되므로 전극 조립체(10)에서 발생되는 가스에 의하여 상승되는 내부 압력을 벤트홀(41)로 전달하여 원활히 배출할 수 있게 한다.The top insulator 20 has an internal vent hole 27 and an internal electrolyte injection hole 28. Since the inner vent hole 27 is formed to correspond to the vent hole 41 provided in the cap plate 40, the inner vent hole 27 is smoothly transferred to the vent hole 41 by the gas generated by the gas generated in the electrode assembly 10. To be discharged.
내부 전해액 주입구(28)는 캡 플레이트(40)에 구비되는 전해액 주입구(42)에 대응하여 형성되므로 전해액 주입구(42)를 경유한 전해액이 탑인슐레이터(20)의 내부로 원활히 주입될 수 있게 한다.Since the internal electrolyte injection hole 28 is formed corresponding to the electrolyte injection hole 42 provided in the cap plate 40, the electrolyte through the electrolyte injection hole 42 may be smoothly injected into the top insulator 20.
도 3는 도 2에 적용된 전극 조립체의 사시도이고, 도 4은 도 3의 전극 조립체에 탑 인슐레이터를 조립하고 집전부재를 분리한 상태의 사시도이다. 도 2 내지 도 4를 참조하면, 전극 조립체(10)는 전기 절연재인 세퍼레이터(13)의 양측에 전극(11, 12; 예를 들면, "음극과 양극")을 배치하여 형성된다.FIG. 3 is a perspective view of the electrode assembly applied to FIG. 2, and FIG. 4 is a perspective view of a top insulator assembled to the electrode assembly of FIG. 3 and a current collector member separated. 2 to 4, the electrode assembly 10 is formed by disposing electrodes 11 and 12 (eg, “cathodes and anodes”) on both sides of the separator 13, which is an electrical insulation material.
일례로써, 음극(11), 세퍼레이터(13) 및 양극(12)은 권취될 수 있다. 도시하지 않았으나, 음극, 세퍼레이터 및 양극은 적층되어, 전극 조립체를 형성할 수도 있다.As an example, the cathode 11, the separator 13, and the anode 12 may be wound. Although not shown, the cathode, the separator, and the anode may be stacked to form an electrode assembly.
음, 양극(11, 12)은 각각 금속박(예를 들면, Cu, Al 포일)의 집전체에 활물질을 도포한 코팅부(111, 121), 및 활물질을 도포하지 않아서 노출된 집전체로 형성되는 무지부 탭(112, 122)을 포함한다. 무지부 탭(112, 122)은 권취된 전극 조립체(10)의 일단에 배치되고, 전극 조립체(10)의 1회 권취 범위(WD) 내에서 거리(D)를 두고 배치된다.The positive electrodes 11 and 12 are formed of coatings 111 and 121 coated with active materials on current collectors of metal foils (for example, Cu and Al foils), and current collectors exposed by not applying active materials. And non-stick tabs 112 and 122. The plain tabs 112 and 122 are disposed at one end of the wound electrode assembly 10, and are disposed at a distance D within the single winding range WD of the electrode assembly 10.
즉, 음극(11)의 무지부 탭들(112)은 권취되는 전극 조립체(10)의 일단(도 3의 상단)에서 일측(도 3의 좌측)에 배치되고, 양극(12)의 무지부 탭들(122)은 권취되는 전극 조립체(10)의 동일단(도 3의 상단)에서 음극(11)의 무지부 탭들(112)과 거리(D)를 두고 다른 측(도 3의 우측)에 배치된다.That is, the plain tabs 112 of the negative electrode 11 are disposed at one side (left side of FIG. 3) at one end (the top of FIG. 3) of the electrode assembly 10 to be wound, and the plain tabs of the positive electrode 12 ( 122 is disposed on the other side (right side of FIG. 3) at a distance D from the uncoated tabs 112 of the negative electrode 11 at the same end (top of FIG. 3) of the electrode assembly 10 to be wound.
무지부 탭들(112, 122)이 전극 조립체(10)의 권취 회당 하나씩 구비되어 충전 및 방전되는 전류를 흐르게 하므로 무지부 탭들(112, 122)의 전체 저항이 감소된다. 따라서 전극 조립체(10)는 무지부 탭들(112, 122)을 통하여 고용량의 전류를 충전 및 방전할 수 있다.Since the tabs 112 and 122 are provided for each winding of the electrode assembly 10 to flow a current to be charged and discharged, the overall resistance of the tabs 112 and 122 is reduced. Therefore, the electrode assembly 10 may charge and discharge a high current through the plain tabs 112 and 122.
제1실시예에서, 전극 조립체(10)는 2개의 조립체로 형성되어 있다. 도시하지 않았으나, 전극 조립체는 하나 또는 3개 또는 4개로 형성될 수도 있다(미도시). 즉 전극 조립체(10)는 캡 플레이트(40)의 폭 방향(x축 방향)으로 나란하게 배치되는 제1조립체(101)와 제2조립체(102)를 포함한다.In the first embodiment, the electrode assembly 10 is formed of two assemblies. Although not shown, the electrode assembly may be formed of one, three, or four (not shown). That is, the electrode assembly 10 includes a first assembly 101 and a second assembly 102 that are arranged side by side in the width direction (x-axis direction) of the cap plate 40.
또한, 제1, 제2조립체(101, 102)는 대략 직육면체 형상의 케이스(30)에 수용될 수 있도록 y축 방향 양단에서 반원을 형성하는 플레이트 모양으로 형성될 수 있다.In addition, the first and second assemblies 101 and 102 may be formed in a plate shape to form semicircles at both ends of the y-axis direction so as to be accommodated in the case 30 having a substantially rectangular parallelepiped shape.
일례로써, 음, 양극단자(51, 52)는 캡 플레이트(40)의 제1, 제2단자홀(H1, H2)에 각각 대응하여 캡 플레이트(40)의 외측에 배치되고 내부에 단자 공간(510, 520)을 형성하여, 무지부 탭(112, 122)에 전기적으로 연결된다.For example, the positive and negative terminals 51 and 52 are disposed outside the cap plate 40 corresponding to the first and second terminal holes H1 and H2 of the cap plate 40, respectively, and have a terminal space ( 510 and 520, which are electrically connected to the plain tabs 112 and 122.
무지부 탭들(112, 122)은 제1, 제2조립체(101, 102)를 음, 양극단자(51, 52)에 연결한다. 일례로써, 무지부 탭들(112, 122)은 복수의 군으로 형성될 수 있다. 무지부 탭들(112, 122)은 캡 플레이트(40)의 제1, 제2단자홀(H1, H2)을 경유하여 음, 양극단자(51, 52)의 단자 공간(510, 520)에서 전기적으로 서로 연결된다.The non-coated tabs 112 and 122 connect the first and second assemblies 101 and 102 to the negative and positive terminal 51 and 52. As an example, the tabless tabs 112 and 122 may be formed in a plurality of groups. The uncoated tabs 112 and 122 are electrically connected to the terminal spaces 510 and 520 of the negative and positive terminals 51 and 52 via the first and second terminal holes H1 and H2 of the cap plate 40. Are connected to each other.
제1실시예에서 무지부 탭들(112, 122)은 제1탭군(G11, G21)과 제2탭군(G12, G22)을 포함한다. 제1탭군(G11, G21)은 제1조립체(101)의 음, 양극들(11, 12)에 각각 연결되고 음, 양극단자(51, 52)에 전기적으로 연결된다. 제2탭군(G12, G22)은 제2조립체(102)의 음, 양극들(11, 12)에 각각 연결되고 음, 양극단자(51, 52)에 전기적으로 연결된다.In the first embodiment, the non-coating tabs 112 and 122 include first tap groups G11 and G21 and second tap groups G12 and G22. The first tap groups G11 and G21 are connected to the negative and positive electrodes 11 and 12 of the first assembly 101 and electrically connected to the negative and positive terminal 51 and 52, respectively. The second tap group G12 and G22 are connected to the negative and positive electrodes 11 and 12 of the second assembly 102 and electrically connected to the negative and positive terminal 51 and 52, respectively.
탑 인슐레이터(20)는 탭 인출구(201, 202)를 더 구비한다. 탭 인출구(201, 202)는 전극 조립체(10)에 연결된 무지부 탭들(112, 122)를 통과시켜, 무지부 탭들(112, 122)이 제1, 제2단자홀(H1, H2)을 경유하여, 단자 공간(510, 520) 내부로 벋어서 음, 양극단자(51, 52)에 전기적으로 연결될 수 있게 한다.The top insulator 20 further includes tab outlets 201 and 202. The tab outlets 201 and 202 pass through the plain tabs 112 and 122 connected to the electrode assembly 10 so that the plain tabs 112 and 122 pass through the first and second terminal holes H1 and H2. As a result, the inside of the terminal spaces 510 and 520 may be squeezed into the negative and positive terminals 51 and 52.
도 5은 도 1의 Ⅴ-Ⅴ 선을 따라 자른 단면도이고, 도 6은 도 1의 Ⅵ-Ⅵ 선을 따라 자른 단면도이다. 도 5 및 도 6을 참조하면, 음, 양극단자(51, 52)는 무지부 탭들(112, 122)의 상단에 대응하는 제1평면부(511, 521), 및 제1평면부(511, 521)의 외곽에서 절곡되어 무지부 탭들(112, 122)의 측면에 대응하는 제1측면부(512, 522)를 포함한다. 음, 양극단자(51, 52)는 내부 공간을 가지는 대략 직육면체로 형성된다.5 is a cross-sectional view taken along the line VV of FIG. 1, and FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 1. Referring to FIGS. 5 and 6, the positive and negative terminals 51 and 52 may include the first flat portions 511 and 521 corresponding to the upper ends of the plain tabs 112 and 122, and the first flat portions 511 and 511. The first side portions 512 and 522 which are bent at the outer side of the 521 and correspond to the side surfaces of the plain tabs 112 and 122 are included. Well, the anode terminals 51 and 52 are formed in a substantially rectangular parallelepiped having an internal space.
도 2, 도 4 및 도 5를 참조하면, 음극단자(51)는 제1단자홀(H1)의 외부로 돌출되고, 단자 공간(510)을 형성하며, 단자 공간(510)의 내부에서 음극(11)의 무지부 탭(112)에 전기적으로 연결되며, 캡 플레이트(40)에 전기적인 절연 상태로 설치된다. 또한, 음극단자(51)는 내측에서 캡 플레이트(40)의 평면 방향으로 확장되는 플랜지(513)로 개스킷(631)를 개재하여 캡 플레이트(40)의 내면에 지지된다.2, 4, and 5, the negative electrode terminal 51 protrudes to the outside of the first terminal hole H1, forms the terminal space 510, and has a negative electrode inside the terminal space 510. 11 is electrically connected to the tab tab 112 of the uncoated portion, and is installed in the cap plate 40 in an electrically insulated state. In addition, the negative electrode terminal 51 is supported on the inner surface of the cap plate 40 via a gasket 631 with a flange 513 extending in the planar direction of the cap plate 40 from the inside.
도 2, 도 4 및 도 6을 참조하면, 양극단자(52)는 제2단자홀(H2)의 외부로 돌출되고, 캡 플레이트(40)와 일체 또는 캡 플레이트(40)에 용접되며, 단자 공간(520)을 형성하고, 단자 공간(520)의 내부에서 양극(12)의 무지부 탭(122)에 전기적으로 연결된다.2, 4, and 6, the anode terminal 52 protrudes to the outside of the second terminal hole H2, is integrally formed with the cap plate 40, or welded to the cap plate 40, and the terminal space. 520 is formed and is electrically connected to the uncoated tab 122 of the anode 12 in the terminal space 520.
다시 도 2, 도 5 및 도 6을 참조하면, 무지부 탭들(112, 122)은 집전부재(71, 72)에 용접되고, 음, 양극단자(51, 52)는 단자 공간(510, 520)의 내면으로 집전부재(71, 72)에 용접으로 연결된다. 즉 무지부 탭들(112, 122)은 집전부재(71, 72)를 개재하여 단자 공간(510, 520)에서 음, 양극단자(51, 52)에 전기적으로 연결된다.2, 5, and 6, the tabs 112 and 122 are welded to the current collecting members 71 and 72, and the negative and positive terminals 51 and 52 are connected to the terminal spaces 510 and 520. It is connected to the current collector members 71 and 72 by welding. In other words, the tabs 112 and 122 are electrically connected to the negative and positive electrode terminals 51 and 52 in the terminal spaces 510 and 520 through the current collectors 71 and 72.
집전부재(71, 72)는 무지부 탭들(112, 122)의 상단에 대응하는 제2평면부(711, 721), 및 제2평면부(711, 721)의 양단에서 절곡되어 무지부 탭들(112, 122)의 측면에 대응하는 제2측면부(712, 722)를 포함한다. 음, 양극단자(51, 52)는 제1측면부(512, 522)로 집전부재(71, 72)의 제2측면부(712, 722)에 전기적으로 연결된다.The current collecting members 71 and 72 are bent at both ends of the second flat portions 711 and 721 and the second flat portions 711 and 721 corresponding to the upper ends of the non-coating tabs 112 and 122, respectively. Second side portions 712, 722 corresponding to the side surfaces 112, 122. The positive terminals 51 and 52 are electrically connected to the second side parts 712 and 722 of the current collecting members 71 and 72 by the first side parts 512 and 522.
집전부재(71, 72)의 제2측면부(712, 722)는 무지부 탭(112, 122)의 길이 방향에 대하여, 중간 부분에서 무지부 탭들(112, 122)을 향하는 제2함몰부(713, 723)로 무지부 탭들(112, 122)에 전기적으로 연결된다. 제2함몰부(713, 723)는 집전부재(71, 72)와 무지부 탭들(112, 122)의 기계적 및 전기적 연결을 강화한다.The second side portions 712 and 722 of the current collecting members 71 and 72 have a second recess 713 facing the plain tabs 112 and 122 at an intermediate portion with respect to the length direction of the plain tabs 112 and 122. 723, is electrically connected to the plain tabs 112, 122. The second recesses 713 and 723 strengthen the mechanical and electrical connection of the current collecting members 71 and 72 and the plain tabs 112 and 122.
이와 같이, 제1실시예의 이차 전지(1)는 전극 조립체(10)의 무지부 탭들(112, 122)을 집전부재(71, 72)에 연결하고, 집전부재(71, 72)를 음, 양극단자(51, 52)에 직접 연결하므로 무지부 탭들(112, 122)을 음, 양극단자(51, 52)에 연결하는데 부품의 개수를 줄이고, 연결 구조를 최적화 할 수 있다. 따라서 이차 전지(1)에서 내부공간의 활용도가 높아질 수 있다.As described above, the secondary battery 1 of the first embodiment connects the tabs 112 and 122 of the electrode assembly 10 to the current collecting members 71 and 72, and connects the current collecting members 71 and 72 to the negative and positive electrodes. Since the direct connection to the terminals 51 and 52 connects the plain tabs 112 and 122 to the negative and positive terminals 51 and 52, the number of parts can be reduced and the connection structure can be optimized. Therefore, the utilization of the internal space in the secondary battery 1 can be increased.
이하에서 본 발명의 다양한 실시예들에 대하여 설명한다. 제1실시예 및 기 설명된 실시예와 비교하여, 서로 동일한 구성에 대한 설명을 생략하고 서로 다른 구성에 대한 설명을 기재한다.Hereinafter, various embodiments of the present invention will be described. Compared to the first embodiment and the previously described embodiment, descriptions of the same configurations as those of each other are omitted, and descriptions of the different configurations are described.
도 7은 본 발명의 제2실시예에 따른 이차 전지에서 음극단자 측을 절단한 단면도이고, 도 8은 본 발명의 제2실시예에 따른 이차 전지에서 양극단자 측을 절단한 단면도이다.7 is a cross-sectional view of the negative terminal of the secondary battery according to the second embodiment of the present invention, and FIG. 8 is a cross-sectional view of the positive electrode terminal of the secondary battery according to the second embodiment of the present invention.
도 7 및 도 8을 참조하면, 제2실시예에 따른 이차 전지(2)는 제1실시예의 이차 전지(1)에 비하여, 집전부재(71, 72)를 사용하지 않는다. 제2실시예의 이차 전지(2)에서 음, 양극단자(53, 54)는 단자 공간(530, 540)의 내면으로 무지부 탭들(112, 122)에 용접으로 직접 연결된다.7 and 8, the secondary battery 2 according to the second embodiment does not use the current collector members 71 and 72 as compared to the secondary battery 1 of the first embodiment. In the secondary battery 2 of the second embodiment, negative and positive electrode terminals 53 and 54 are directly connected by welding to the tabs 112 and 122 to the inner surface of the terminal spaces 530 and 540.
이 경우, 제2실시예의 이차 전지(2)는 전극 조립체(10)의 무지부 탭들(112, 122)을 음, 양극단자(53, 54)에 직접 연결하므로 무지부 탭들(112, 122)을 음, 양극단자(53, 54)에 연결하는데 부품의 개수를 더 줄이고, 연결 구조를 더 최적화 할 수 있다. 따라서 이차 전지(2)에서 내부공간의 활용도가 더 높아질 수 있다.In this case, the secondary battery 2 of the second embodiment directly connects the tabs 112 and 122 of the electrode assembly 10 to the negative and positive terminals 53 and 54, thereby connecting the tabs 112 and 122. Well, it is possible to further reduce the number of parts to connect to the positive terminal (53, 54), and further optimize the connection structure. Therefore, the utilization of the internal space in the secondary battery 2 may be higher.
구체적으로 보면, 음, 양극단자(53, 54)의 제1측면부(532, 542)는 무지부 탭들(112, 122)의 측면을 향하는 제1함몰부(533, 543)로 무지부 탭들(112, 122)에 전기적으로 연결된다. 제1함몰부(533, 543)는 음, 양극단자(53, 54)와 무지부 탭들(112, 122)의 기계적 및 전기적 연결을 강화한다.Specifically, um, the first side portions 532 and 542 of the positive electrode terminals 53 and 54 are the first tab portions 533 and 543 facing the sides of the plain tabs 112 and 122, and the plain tabs 112 are formed. , 122). The first recesses 533 and 543 strengthen the mechanical and electrical connection of the negative and positive terminals 53 and 54 and the tabs 112 and 122.
도 9는 본 발명의 제3실시예에 따른 이차 전지에서 음극단자 측을 절단한 단면도이고, 도 10은 본 발명의 제3실시예에 따른 이차 전지에서 양극단자 측을 절단한 단면도이다.FIG. 9 is a cross-sectional view of the negative terminal of the secondary battery according to the third embodiment of the present invention, and FIG. 10 is a cross-sectional view of the positive electrode terminal of the secondary battery according to the third embodiment of the present invention.
도 9 및 도 10을 참조하면, 제3실시예의 이차 전지(3)에서, 집전부재(73, 74)의 제2측면부(732, 742)는 무지부 탭(112, 122)의 길이 방향(z축 방향)에 대하여, 하단 부분에서 무지부 탭들(112, 122)을 향하는 제2돌출부(733, 743)로 무지부 탭들(112, 122)에 전기적으로 연결된다. 제2돌출부(733, 743)는 집전부재(73, 74)와 무지부 탭들(112, 122)의 기계적 및 전기적 연결을 강화한다.9 and 10, in the secondary battery 3 of the third embodiment, the second side portions 732 and 742 of the current collecting members 73 and 74 are formed in the length direction z of the plain tabs 112 and 122. Axial direction), the second protrusions 733 and 743 facing the plain tabs 112 and 122 at the lower portion thereof are electrically connected to the plain tabs 112 and 122. The second protrusions 733 and 743 strengthen the mechanical and electrical connection of the current collecting members 73 and 74 and the plain tabs 112 and 122.
음, 양극단자(55, 56)의 제1측면부(552, 562)는 집전부재(73, 74)의 제2측면부(732, 742)를 향하는 제1함몰부(553, 563)로 제2측면부(732, 742)에 전기적으로 연결된다. 제1함몰부(553, 563)는 음, 양극단자(55, 56)와 집전부재(73, 74)의 기계적 및 전기적 연결을 강화한다.The first side portions 552 and 562 of the positive electrode terminals 55 and 56 are first recessed portions 553 and 563 facing the second side portions 732 and 742 of the current collecting members 73 and 74, respectively. And electrically connected to 732 and 742. The first recesses 553 and 563 reinforce mechanical and electrical connections between the negative and positive terminals 55 and 56 and the current collecting members 73 and 74.
도 11은 본 발명의 제4실시예에 따른 이차 전지에서 음극단자 측을 절단한 단면도이다. 도 11을 참조하면, 제4실시예의 이차 전지(4)는 편의상 음극단자(57)를 예로 설명되어 있다.11 is a cross-sectional view of the negative terminal of the secondary battery according to the fourth embodiment of the present invention. Referring to FIG. 11, the secondary battery 4 of the fourth embodiment has been described as an example of the negative electrode terminal 57 for convenience.
음극단자(57)의 제1측면부(572)는 무지부 탭들(112)의 측면을 향하는 제1돌출부(573)로 무지부 탭들(112)에 전기적으로 연결된다. 제1돌출부(573)는 음극단자(57)와 무지부 탭들(112)의 기계적 및 전기적 연결을 강화한다.The first side portion 572 of the negative electrode terminal 57 is electrically connected to the plain tabs 112 by a first protrusion 573 facing the side of the plain tabs 112. The first protrusion 573 strengthens the mechanical and electrical connection between the negative electrode terminal 57 and the plain tabs 112.
편의상, 제4실시예에서 제1돌출부(573)를 갖는 음극단자(57)는 무지부 탭들(112)의 측면을 향하는 제1돌출부(573)로 무지부탭들(112)에 연결된다. 도시하지 않았으나, 제4실시예에서 제1돌출부(573)를 갖는 음극단자(57)는 제1실시예의 함몰부(713, 723)을 구비한 집전부재(71, 72)(도 5 및 도 6 참조)에도 적용될 수 있다.For convenience, in the fourth embodiment, the negative electrode terminal 57 having the first protrusion 573 is connected to the plain tabs 112 by the first protrusion 573 facing the side of the non-coating tabs 112. Although not shown, in the fourth embodiment, the negative electrode terminal 57 having the first protrusion 573 is provided with current collectors 71 and 72 having recesses 713 and 723 of the first embodiment (FIGS. 5 and 6). May also apply.
도 12는 본 발명의 제5실시예에 따른 이차 전지에서 음극단자 측을 절단한 단면도이다. 도 12를 참조하면, 제5실시예의 이차 전지(5)는 편의상 음극단자(67)를 예로 설명되어 있다.12 is a cross-sectional view of the negative terminal of the secondary battery according to the fifth embodiment of the present invention. Referring to FIG. 12, the secondary battery 5 of the fifth embodiment has been described using the negative electrode terminal 67 as an example.
도 12 참조하면, 제5실시예의 이차 전지(5)에서, 집전부재(73)의 제2측면부(732)는 무지부 탭(112)의 길이 방향(z축 방향)에서 하단 부분에서 무지부 탭들(112)을 향하는 제2돌출부(733)로 무지부 탭들(112)에 전기적으로 연결된다. 제2돌출부(733)는 집전부재(73)와 무지부 탭들(112)의 기계적 및 전기적 연결을 강화한다.Referring to FIG. 12, in the secondary battery 5 of the fifth embodiment, the second side surface portion 732 of the current collecting member 73 may have the plain tabs at the bottom portion in the longitudinal direction (z-axis direction) of the plain tab 112. A second protrusion 733 facing the 112 is electrically connected to the plain tabs 112. The second protrusion 733 strengthens the mechanical and electrical connection of the current collecting member 73 and the plain tabs 112.
음극단자(67)의 제1측면부(672)는 집전부재(73)의 제2측면부(732)를 향하는 제1돌출부(673)로 제2측면부(732)에 전기적으로 연결된다. 제1돌출부(673)는 음극단자(67)와 집전부재(73)의 기계적 및 전기적 연결을 강화한다.The first side portion 672 of the negative electrode terminal 67 is electrically connected to the second side portion 732 by a first protrusion 673 facing the second side portion 732 of the current collecting member 73. The first protrusion 673 strengthens the mechanical and electrical connection between the negative electrode terminal 67 and the current collector member 73.
편의상, 제5실시예에서 제1돌출부(673)를 갖는 음극단자(67)는 무지부 탭들(112)의 길이 방향(z축 방향)에 대하여, 하단 부분에서 제2돌출부(733)를 구비한 집전부재(73)에 적용하고 있다. 도시하지 않았으나, 제5실시예에서 제1돌출부(673)를 갖는 음극단자(67)는 제1실시예의 함몰부(713, 723)을 구비한 집전부재(71, 72)(도 5 및 도 6 참조)에도 적용될 수 있다.For convenience, in the fifth embodiment, the negative electrode terminal 67 having the first protrusion 673 includes a second protrusion 733 at a lower end thereof with respect to the longitudinal direction (z-axis direction) of the tabs 112. It is applied to the current collector member 73. Although not shown, in the fifth embodiment, the negative electrode terminal 67 having the first protrusion 673 is provided with current collectors 71 and 72 having depressions 713 and 723 of the first embodiment (FIGS. 5 and 6). May also apply.
도 13은 본 발명의 제6실시예에 따른 이차 전지에서 양극단자 측을 절단한 단면도이다. 도 13을 참조하면, 제6실시예의 이차 전지(6)는 편의상 양극단자(58)를 예로 설명되어 있다.FIG. 13 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a sixth exemplary embodiment of the present invention. FIG. Referring to FIG. 13, the secondary battery 6 of the sixth embodiment has been described with the positive electrode terminal 58 as an example.
도 13 참조하면, 제6실시예의 이차 전지(6)에서, 집전부재(73)의 제2측면부(732)는 무지부 탭(112)의 길이 방향(z축 방향)에 대하여, 하단 부분에서 무지부 탭들(112)을 향하는 제2돌출부(733)로 무지부 탭들(112)에 전기적으로 연결된다. 제2돌출부(733)는 집전부재(73)와 무지부 탭들(112)의 기계적 및 전기적 연결을 강화한다.Referring to FIG. 13, in the secondary battery 6 of the sixth embodiment, the second side surface portion 732 of the current collecting member 73 is plain at the bottom portion with respect to the longitudinal direction (z-axis direction) of the plain tab 112. A second protrusion 733 facing the sub tabs 112 is electrically connected to the plain tabs 112. The second protrusion 733 strengthens the mechanical and electrical connection of the current collecting member 73 and the plain tabs 112.
양극단자(58)의 제1평면부(581)은 개구(584)를 형성하여, 집전부재(73)의 제2평면부(731)에 용접(W)으로 연결된다. 개구(584)를 통하여 양극단자(58)의 제1평면부(581)와 집전부재(73)의 제2평면부(731)가 서로 용접되므로 양극단자(58)와 집전부재(73)의 기계적 및 전기적 연결이 강화된다.The first planar portion 581 of the positive electrode terminal 58 forms an opening 584, and is connected to the second planar portion 731 of the current collecting member 73 by welding (W). Since the first flat portion 581 of the positive electrode terminal 58 and the second flat portion 731 of the current collecting member 73 are welded to each other through the opening 584, the mechanical properties of the positive electrode terminal 58 and the current collecting member 73 are welded to each other. And electrical connection is enhanced.
편의상, 제6실시예에서 제1개구(584)를 갖는 음극단자(58)는 집전부재(73)에 용접되는 구조를 적용하고 있다. 도시하지 않았으나, 제6실시예에서 제1개구(584)를 갖는 음극단자(58)는 제1실시예의 집전부재(71, 72)(도 5 및 도 6 참조) 및 제3실시예의 집전부재(73, 74)(도 9 및 도 10참조)에도 적용될 수 있다.For convenience, in the sixth embodiment, the negative electrode terminal 58 having the first opening 584 has a structure welded to the current collector member 73. Although not shown, in the sixth embodiment, the negative electrode terminal 58 having the first opening 584 includes the current collecting members 71 and 72 (see FIGS. 5 and 6) of the first embodiment and the current collecting member of the third embodiment ( 73, 74 (see FIGS. 9 and 10).
도 14는 본 발명의 제7실시예에 따른 이차 전지에서 양극단자 측을 절단한 단면도이다. 도 14를 참조하면, 제7실시예의 이차 전지(7)는 편의상 음극단자(68)를 예로 설명되어 있다.14 is a cross-sectional view of a cathode terminal cut in a rechargeable battery according to a seventh exemplary embodiment of the present invention. Referring to FIG. 14, the secondary battery 7 according to the seventh embodiment has been described using the negative electrode terminal 68 as an example.
도 14 참조하면, 제7실시예의 이차 전지(7)에서, 집전부재(73)의 제2측면부(732)는 무지부 탭(122)의 길이 방향(z축 방향)에 대하여, 하단 부분에서 무지부 탭들(122)을 향하는 제2돌출부(733)로 무지부 탭들(122)에 전기적으로 연결된다. 제2돌출부(733)는 집전부재(73)와 무지부 탭들(122)의 기계적 및 전기적 연결을 강화한다.Referring to FIG. 14, in the secondary battery 7 of the seventh embodiment, the second side surface portion 732 of the current collecting member 73 is plain at the lower portion with respect to the longitudinal direction (z-axis direction) of the plain tab 122. A second protrusion 733 facing the sub tabs 122 is electrically connected to the plain tabs 122. The second protrusion 733 reinforces the mechanical and electrical connection of the current collecting member 73 and the plain tabs 122.
양극단자(68)의 제1평면부(681)는 개구(684)를 형성하여, 집전부재(75)의 제2평면부(751)는 개구(684)에 돌기(754)로 결합되어 용접(W)으로 연결된다. 개구(684)를 통하여 양극단자(68)의 제1평면부(681)와 집전부재(75)의 제2평면부(751)가 서로 결합되어 용접되므로 양극단자(68)와 집전부재(75)의 기계적 및 전기적 연결이 더욱 강화된다.The first flat portion 681 of the positive electrode terminal 68 forms an opening 684, and the second flat portion 751 of the current collecting member 75 is joined to the opening 684 by a protrusion 754 to be welded. W). Since the first flat portion 681 of the positive electrode terminal 68 and the second flat portion 751 of the current collecting member 75 are welded to each other through the opening 684, the positive electrode terminal 68 and the current collecting member 75 are welded. The mechanical and electrical connection of the is further strengthened.
편의상, 제7실시예에서 제1개구(684)를 갖는 음극단자(68)는 돌기(754)를 갖는 집전부재(75)에 결합 및 용접되는 구조를 적용하고 있다. 도시하지 않았으나, 제7실시예에서 제1개구(684)를 갖는 음극단자(68)는 제1실시예의 집전부재(71, 72)(도 5 및 도 6 참조) 및 제3실시예의 집전부재(73, 74)(도 9 및 도 10참조)에도 적용될 수 있다.For convenience, in the seventh embodiment, the negative electrode terminal 68 having the first opening 684 is coupled to and welded to the current collecting member 75 having the protrusion 754. Although not shown, the negative electrode terminal 68 having the first opening 684 in the seventh embodiment includes the current collecting members 71 and 72 (see FIGS. 5 and 6) of the first embodiment and the current collecting member of the third embodiment ( 73, 74 (see FIGS. 9 and 10).
이상을 통해 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것이 아니고 특허청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시하는 것이 가능하고 이 또한 본 발명의 범위에 속하는 것은 당연하다.Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.
- 부호의 설명 -Description of the sign
1, 2, 3, 4, 5, 6, 7: 이차 전지 10: 전극 조립체1, 2, 3, 4, 5, 6, 7: secondary battery 10: electrode assembly
11: 음극 12: 양극11: cathode 12: anode
13: 세퍼레이터 20: 탑 인슐레이터13: Separator 20: Top Insulator
27: 내부 벤트홀 28: 내부 전해액 주입구27: internal vent hole 28: internal electrolyte injection hole
30: 케이스 31: 개구30: case 31: opening
40: 캡 플레이트 41: 벤트홀40: cap plate 41: vent hole
42: 전해액 주입구 51, 53, 55, 57, 58, 68: 음극단자42: electrolyte inlet 51, 53, 55, 57, 58, 68: negative electrode terminal
52, 54, 56, 67: 양극단자 71, 72, 73, 74, 75: 집전부재52, 54, 56, 67: positive electrode terminal 71, 72, 73, 74, 75: current collector member
101, 102: 제1, 제2조립체 111, 121: 코팅부101, 102: first and second assembly 111, 121: coating
112, 122: 무지부 탭 201, 202: 탭 인출구112, 122: tab tap 201, 202: tap outlet
411: 벤트 플레이트 412: 노치411: vent plate 412: notch
421: 밀봉 마개 510, 520, 530, 540: 단자 공간421: sealing stopper 510, 520, 530, 540: terminal space
511, 521, 581, 681: 제1평면부 513: 플랜지511, 521, 581, and 681: first plane portion 513: flange
512, 522, 532, 542, 552, 562, 672: 제1측면부512, 522, 532, 542, 552, 562, 672: first side portion
533, 543, 553, 563: 제1함몰부 572, 673: 제1돌출부533, 543, 553, 563: first recess 572, 673: first protrusion
584, 684: 개구 631: 개스킷584, 684: opening 631: gasket
711, 721, 731, 751: 제2평면부 712, 722, 732, 742: 제2측면부711, 721, 731, 751: second plane portion 712, 722, 732, 742: second side portion
713, 723, 743: 제2함몰부 733: 제2돌출부713, 723, 743: second depression 733: second projection
754: 돌기 D: 거리754: turning D: distance
G11, G21: 제1탭군 G12, G22: 제2탭군G11, G21: first tap group G12, G22: second tap group
H1, H2: 제1, 제2단자홀 W: 용접H1, H2: First and second terminal holes W: Welding
WD: 1회 권취 범위WD: One time winding range

Claims (16)

  1. 코팅부와 무지부 탭들을 가지는 전극을 세퍼레이터의 양측에 배치하여 형성되는 전극 조립체;An electrode assembly formed by disposing an electrode having a coating part and a tab part on both sides of the separator;
    상기 전극 조립체를 수용하는 케이스;A case accommodating the electrode assembly;
    상기 케이스의 개구에 결합되고 단자홀을 구비하는 캡 플레이트; 및A cap plate coupled to the opening of the case and having a terminal hole; And
    상기 캡 플레이트의 외측에 배치되고 상기 단자홀에 연결되는 단자 공간을 내부에 형성하며 상기 단자홀을 경유하는 상기 무지부 탭들을 상기 단자 공간의 내부에서 전기적으로 연결하는 전극단자An electrode terminal disposed inside the cap plate and connected to the terminal hole therein and electrically connecting the plain tabs through the terminal hole to the inside of the terminal space;
    를 포함하는 이차 전지.Secondary battery comprising a.
  2. 제1항에 있어서,The method of claim 1,
    상기 전극단자는The electrode terminal
    상기 단자 공간의 내면으로 상기 무지부 탭들에 용접으로 연결되는 이차 전지.A secondary battery connected to the plain tabs by welding to the inner surface of the terminal space.
  3. 제1항에 있어서,The method of claim 1,
    상기 전극단자는The electrode terminal
    상기 무지부 탭들의 상단에 대응하는 제1평면부, 및A first flat portion corresponding to an upper end of the plain tabs, and
    상기 제1평면부의 외곽에서 절곡되어 상기 무지부 탭들의 측면에 대응하는 제1측면부를 포함하는 이차 전지.A secondary battery including a first side surface portion which is bent at an outer side of the first flat portion and corresponding to side surfaces of the plain tabs.
  4. 제3항에 있어서,The method of claim 3,
    상기 제1측면부는The first side portion
    상기 무지부 탭들의 측면을 향하는 제1함몰부로 상기 무지부 탭들에 전기적으로 연결되는 이차 전지.A secondary battery electrically connected to the plain tabs with a first recess toward the side of the plain tabs.
  5. 제3항에 있어서,The method of claim 3,
    상기 제1측면부는 The first side portion
    상기 무지부 탭들의 측면을 향하는 제1돌출부로 상기 무지부 탭들에 전기적으로 연결되는 이차 전지.A secondary battery electrically connected to the uncoated tabs with a first protrusion facing the side of the uncoated tabs.
  6. 제1항에 있어서,The method of claim 1,
    상기 무지부 탭들은 집전부재에 용접되고,The plain tabs are welded to the current collecting member,
    상기 전극단자는The electrode terminal
    상기 단자 공간의 내면으로 상기 집전부재에 용접으로 연결되는 이차 전지.A secondary battery connected to the current collector by welding to the inner surface of the terminal space.
  7. 제6항에 있어서,The method of claim 6,
    상기 집전부재는The current collector member
    상기 무지부 탭들의 상단에 대응하는 제2평면부, 및A second flat portion corresponding to an upper end of the plain tabs, and
    상기 제2평면부의 양단에서 절곡되어 상기 무지부 탭들의 측면에 대응하는 제2측면부를 포함하는 이차 전지.And a second side portion bent at both ends of the second planar portion to correspond to side surfaces of the plain tabs.
  8. 제7항에 있어서,The method of claim 7, wherein
    상기 제2측면부는The second side portion
    상기 무지부 탭의 길이 방향에 대하여, 중간 부분에서 상기 무지부 탭들을 향하는 제2함몰부로 상기 무지부 탭들에 전기적으로 연결되는 이차 전지.A secondary battery electrically connected to the plain tabs with a second depression toward the plain tabs in a middle portion with respect to the length direction of the plain tabs.
  9. 제7항에 있어서,The method of claim 7, wherein
    상기 제2측면부는The second side portion
    상기 무지부 탭의 길이 방향에 대하여, 하단 부분에서 상기 무지부 탭들을 향하는 제2돌출부로 상기 무지부 탭들에 전기적으로 연결되는 이차 전지.A secondary battery electrically connected to the plain tabs with a second protrusion toward the plain tabs at a lower end thereof in a length direction of the plain tabs.
  10. 제9항에 있어서,The method of claim 9,
    상기 전극단자는The electrode terminal
    상기 집전부재의 제2평면부에 대응하는 제1평면부, 및A first plane portion corresponding to the second plane portion of the current collecting member, and
    상기 제1평면부의 외곽에서 절곡되어 상기 제2평면부에 대응하는 제1측면부를 포함하며,A first side portion bent at an outer side of the first plane portion to correspond to the second plane portion,
    상기 제1측면부는The first side portion
    상기 제2측면부를 향하는 제1함몰부로 상기 제2측면부에 전기적으로 연결되는 이차 전지.A secondary battery electrically connected to the second side portion to the first recessed portion facing the second side portion.
  11. 제9항에 있어서,The method of claim 9,
    상기 전극단자는The electrode terminal
    상기 집전부재의 제2평면부에 대응하는 제1평면부, 및A first plane portion corresponding to the second plane portion of the current collecting member, and
    상기 제1평면부의 외곽에서 절곡되어 상기 제2평면부에 대응하는 제1측면부를 포함하며,A first side portion bent at an outer side of the first plane portion to correspond to the second plane portion,
    상기 제1측면부는 The first side portion
    상기 제2측면부를 향하는 제1돌출부로 상기 제2측면부에 전기적으로 연결되는 이차 전지.A secondary battery electrically connected to the second side portion with a first protrusion toward the second side portion.
  12. 제9항에 있어서,The method of claim 9,
    상기 전극단자는The electrode terminal
    상기 집전부재의 제2평면부에 대응하는 제1평면부, 및A first plane portion corresponding to the second plane portion of the current collecting member, and
    상기 제1평면부의 외곽에서 절곡되어 상기 제2평면부에 대응하는 제1측면부를 포함하며,A first side portion bent at an outer side of the first plane portion to correspond to the second plane portion,
    상기 제1평면부는The first plane portion
    개구를 형성하여 상기 제2평면부에 용접으로 연결되는 이차 전지.A secondary battery is formed in the opening and connected to the second flat portion by welding.
  13. 제9항에 있어서,The method of claim 9,
    상기 전극단자는The electrode terminal
    상기 집전부재의 제2평면부에 대응하는 제1평면부, 및A first plane portion corresponding to the second plane portion of the current collecting member, and
    상기 제1평면부의 외곽에서 절곡되어 상기 제2평면부에 대응하는 제1측면부를 포함하며,A first side portion bent at an outer side of the first plane portion to correspond to the second plane portion,
    상기 제1평면부는 개구를 형성하여The first plane portion forms an opening
    상기 제2평면부는 상기 개구에 돌기로 결합되어 용접되는 이차 전지.The second flat part is a secondary battery which is welded by being joined to the opening by a projection.
  14. 제1항에 있어서,The method of claim 1,
    상기 전극단자는The electrode terminal
    상기 캡 플레이트의 제1단자홀에 개스킷을 개재하여 상기 캡 플레이트와 전기적으로 절연 상태로 설치되고 상기 전극 조립체의 음극에 연결되는 음극단자, 및A negative electrode terminal which is electrically insulated from the cap plate and connected to a negative electrode of the electrode assembly via a gasket in the first terminal hole of the cap plate, and
    상기 캡 플레이트의 제2단자홀의 외측에 구비되어 상기 캡 플레이트에 전기적으로 연결되고 상기 전극 조립체의 양극에 연결되는 양극단자An anode terminal provided at an outer side of the second terminal hole of the cap plate and electrically connected to the cap plate and connected to an anode of the electrode assembly;
    를 포함하는 이차 전지.Secondary battery comprising a.
  15. 제14항에 있어서,The method of claim 14,
    상기 음극단자는The negative terminal
    상기 제1단자홀의 외부로 돌출되고,Protrudes to the outside of the first terminal hole,
    상기 단자 공간을 형성하며,Forming the terminal space,
    상기 단자 공간의 내부에서 상기 음극의 무지부 탭에 전기적으로 연결되고,Is electrically connected to the uncoated tab of the cathode in the terminal space;
    내측에서 상기 캡 플레이트의 평면 방향으로 확장되는 플랜지로 상기 개스킷을 개재하여 상기 캡 플레이트의 내면에 지지되는 이차 전지.The secondary battery is supported on the inner surface of the cap plate via the gasket with a flange extending in the planar direction of the cap plate from the inside.
  16. 제14항에 있어서,The method of claim 14,
    상기 양극단자는The positive terminal
    상기 제2단자홀의 외부로 돌출되고,Protrudes to the outside of the second terminal hole,
    상기 캡 플레이트와 일체 또는 상기 캡 플레이트에 용접되며,Integrally with the cap plate or welded to the cap plate,
    상기 단자 공간을 형성하고,Forming the terminal space,
    상기 단자 공간의 내부에서 상기 양극의 무지부 탭에 전기적으로 연결되는 이차 전지.A secondary battery electrically connected to the plain tab of the positive electrode in the terminal space.
PCT/KR2017/012073 2016-11-01 2017-10-30 Secondary battery WO2018084514A1 (en)

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