WO2018021698A1 - Rechargeable battery - Google Patents

Rechargeable battery Download PDF

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Publication number
WO2018021698A1
WO2018021698A1 PCT/KR2017/006745 KR2017006745W WO2018021698A1 WO 2018021698 A1 WO2018021698 A1 WO 2018021698A1 KR 2017006745 W KR2017006745 W KR 2017006745W WO 2018021698 A1 WO2018021698 A1 WO 2018021698A1
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WO
WIPO (PCT)
Prior art keywords
electrode assembly
electrode
plate
cap plate
width direction
Prior art date
Application number
PCT/KR2017/006745
Other languages
French (fr)
Korean (ko)
Inventor
장명재
곽승호
권민형
변상원
Original Assignee
삼성에스디아이 주식회사
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Publication of WO2018021698A1 publication Critical patent/WO2018021698A1/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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/154—Lid or cover comprising an axial bore for receiving a central current collector
    • 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
    • H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
    • 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
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M50/172—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
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • 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
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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 connecting an electrode assembly with a plurality of plain 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 for drawing the electrode assembly out of the cap plate.
  • One electrode assembly may be accommodated in one case, but a plurality of electrode assemblies may be provided and accommodated in the case.
  • a top insulator interposed between the electrode terminal and the electrode assembly electrically insulates the electrode assembly from the cap plate.
  • the plain tabs connected to the electrode assembly are then welded to the electrode terminals by turning the side of the top insulator.
  • the uncoated tabs have a loose structure between the electrode terminal and the electrode assembly. Accordingly, in the process of inserting the electrode assembly integrally connected with the cap plate to the case, the tabs of the uncoated portion may be folded in the opening of the case, and may be inserted into the case in a folded state to contact different electrodes in the case. That is, the uncoated taps may generate a short circuit and a cell event.
  • One aspect of the present invention is to provide a rechargeable battery that prevents folding of tab paper tabs and prevents short circuits and cell events caused by paper tabs in a case.
  • 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 cap plate coupled to the opening of the case.
  • a top insulator disposed between the electrode assembly and the cap plate, and an electrode terminal installed in the terminal hole of the cap plate and connected to the plain tabs passing through an outer side of the top insulator in a width direction of the cap plate.
  • the top insulator includes an extension that extends in a direction of increasing a passage path of the plain tabs at at least one end of the cap plate in a width direction.
  • the electrode assembly may include a first assembly and a second assembly arranged side by side in the width direction, and the uncoated tabs may be connected to the first tab group and the electrodes of the second assembly connected to the electrodes of the first assembly. It may include a second tap group to be connected.
  • the top insulator further includes a plate portion disposed on the electrode assembly, wherein the expansion portion is a first opening which is convex toward the electrode assembly and concave toward the electrode terminal on the first side of the plate portion in the width direction. And a second open portion that is convex toward the electrode assembly and concave toward the electrode terminal at a second side opposite to the first side of the plate portion.
  • the first tab group is bent to the second side via the outer surface of the first opening portion at the first side and connected to the electrode terminal, and the second tab group is connected to the electrode terminal at the second side via the outer surface of the second opening portion.
  • the first side may be bent and connected to the electrode terminal.
  • the electrode terminal includes a rivet portion installed in the terminal hole, an outer plate disposed outside the cap plate and connected to the rivet portion, and an inner plate disposed inside the cap plate and connected to the rivet portion, The first tab group and the second tab group may be welded to the inner plate.
  • the first tab group and the second tab group are welded to face each other in a welding line set on a lower surface of the inner plate in the width direction, and the rivet part is formed on the upper surface of the inner plate corresponding to the welding line. It may be connected between the ends of the second tab group.
  • the extension part may be further extended in the width direction than an end of the electrode terminal.
  • the extension part may protrude with a height difference higher than the bottom of the electrode terminal.
  • the extension part may be extended with a width difference wider in the width direction than a center position where the plain tabs gather in the electrode assembly.
  • the extension part may have a convex structure toward the electrode assembly.
  • the top insulator further includes a plate portion disposed on the electrode assembly, wherein the expansion portion is formed in a circular cross section set in a direction crossing the width direction on the first side of the width direction of the plate portion. And a second circular portion formed in a circular cross section set in the crossing direction on the second side opposite to the first side of the plate portion.
  • the first tab group is bent to the second side via the outer surface of the first circular portion at the first side and connected to the electrode terminal, and the second tab group is connected to the electrode terminal at the second side via the outer surface of the second circular portion.
  • the first side may be bent and connected to the electrode terminal.
  • the tabs of the uncoated region of the electrode assembly are connected to the electrode terminal via an extended portion provided at the end (width end) of the top insulator, the path of the uncoated region tabs is increased by the expanded portion. . That is, the tabs of the uncoated area are tensioned and are in a tension state where the tension is pulled.
  • the tensioned tab tabs do not fold even when the electrode assembly is inserted into the case and may not come into contact with other electrodes even when inserted into the case. That is, short circuits and cell events caused by the uncoated tabs can be prevented.
  • 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 cross-sectional view taken along line III-III of FIG. 1.
  • FIG. 4 is a perspective view of an electrode assembly applied to FIG. 2.
  • FIG. 5 is a perspective view of a state in which electrode terminals are connected to an electrode assembly via a top insulator applied to FIG. 2.
  • FIG. 6 is an operating state diagram in which a tension is applied to a tab of a plain part by a top insulator.
  • FIG. 7 is a partial plan view of a state in which the tabs of the uncoated region are connected to an electrode terminal via a top insulator.
  • FIG. 8 is a cross-sectional view of a rechargeable battery according to a second 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
  • FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1.
  • the secondary battery 100 includes an electrode assembly 10 for charging and discharging current, a case 30 in which the electrode assembly 10 is embedded, and a case 30.
  • a cap plate 40 coupled to the opening 31 of the top plate, a top insulator 20 disposed between the electrode assembly 10 and the cap plate 40, and electrode terminals 51 and 52.
  • the case 30 sets a space to accommodate the plate-shaped electrode assembly 10.
  • 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 cap plate 40 is coupled to the opening 31 of the case 30 to seal the case 30 and includes two terminal holes H1 and H2.
  • electrode terminals 51 and 52 are provided in the terminal holes H1 and H2.
  • the case 30 and the cap plate 40 may be made of aluminum and welded to each other at the opening 31.
  • the cap plate 40 further includes a vent hole 41 and an electrolyte injection hole 42.
  • the vent hole 41 is sealed by the vent plate 411 to discharge the internal pressure caused by the gas generated inside the secondary battery 100 by the charging and discharging action of the electrode assembly 10.
  • Vent plate 411 When the internal pressure of the secondary battery 100 reaches the set pressure, the vent plate 411 is cut to open the vent hole 41 to discharge the gas and the internal pressure generated by overcharging. Vent plate 411 has a notch 412 leading to an incision.
  • the electrolyte injection hole 42 couples and welds the cap plate 40 to the case 30, and then injects the electrolyte into the case 30. After electrolyte injection, the electrolyte injection port 42 is sealed with a sealing stopper 421.
  • the top insulator 20 is formed of an electrical insulating material and is disposed between the electrode assembly 10 and the cap plate 40 to electrically insulate the electrode assembly 10 and the cap plate 40.
  • the top insulator 20 has an internal vent hole 27. 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 top insulator 20 has an internal electrolyte injection hole 28. 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.
  • the electrode assembly 10 includes a first electrode 11 (eg, a cathode) and a second electrode 12 (eg, an anode) on both sides of the separator 13, which is an electrical insulation material. And the cathode 11, the separator 13, and the anode 12 are formed by joining. Although not shown, the electrode assembly may be formed by winding or stacking the cathode, the separator, and the anode.
  • 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 uncoated tabs 112 and 122 are disposed at one end of the electrode assembly 10 and are disposed to each other at a distance D within the width range T of the electrode assembly 10.
  • the plain tabs 112 of the negative electrode 11 are disposed at one side (the left side of FIG. 4) at one end of the electrode assembly 10 (the top of FIG. 4), and the plain tabs 122 of the positive electrode 12 are At the same end of the electrode assembly 10 (top of FIG. 4), the distance D is disposed on the other side (right side of FIG. 4).
  • the area of the coating parts 111 and 121 in the anodes 11 and 12 is maximized, and the area of the plain parts is narrowed to the minimum by the plain tabs 112 and 122. ) Can be increased in capacity.
  • the electrode assembly 10 may be formed as one (not shown) but is formed in two in the first embodiment. 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.
  • the first and second assemblies 101 and 102 may be formed in a plate shape to form semicircles at both ends in the y-axis direction so as to be accommodated in the case 30 having a substantially rectangular parallelepiped shape.
  • FIG. 5 is a perspective view of a state in which electrode terminals are connected to an electrode assembly via a top insulator applied to FIG. 2. 2 to 5, the electrode assembly 10, that is, the first and second assemblies 101 and 102 are arranged in parallel.
  • Electrode terminals (51, 52) are respectively provided in the terminal holes (H1, H2) of the cap plate 40, the respective first and second assemblies (101, 102) through the uncoated tabs (112, 122) Electrically connected.
  • the uncoated tabs 112 and 122 may be formed in a plurality of groups.
  • the non-coating tabs 112 and 122 are electrode terminals 51 and 52 via an extension part 21 provided at at least one end of the top insulator 20 in the width direction (x-axis direction) of the cap plate 40. Is connected to. Therefore, the extension part 21 lengthens the route through the plain tabs 112 and 122 having the set length.
  • 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 first and second electrodes 11 and 12 of the first assembly 101, respectively, and the second tap groups G12 and G22 are formed of the second assembly 102.
  • the first and second electrodes 11 and 12 are respectively connected.
  • the electrode terminals 51 and 52 may discharge the current from the first and second assemblies 101 and 102 or the non-coating tabs 112 and 122 to charge the current to the first and second assemblies 101 and 102. Respectively).
  • the electrode terminals 51 and 52 may be formed in the same structure. 1 to 3, the electrode terminals 51 and 52 include rivet parts 512 and 522, inner plates 511 and 521, and outer plates 513 and 523.
  • the electrode terminals 51 and 52 are electrically insulated from the cap plate 40 through the inner insulating members 611 and 612 and the gaskets 621 and 622 between the inner surface of the cap plate 40.
  • the inner insulation members 611 and 612 are in close contact with the cap plate 40 on one side and surround the inner plates 511 and 521 and the rivet portions 512 and 522 of the electrode terminals 51 and 52 on one side thereof.
  • the connection structure between the terminals 51 and 52 and the plain tabs 112 and 122 is stabilized.
  • the gaskets 621 and 622 are provided between the rivet parts 512 and 522 of the electrode terminals 51 and 52 and the inner surfaces of the terminal holes H1 and H2 of the cap plate 40.
  • the terminal plates H1 and H2 of the cap plate 40 are sealed and electrically insulated.
  • gaskets 621 and 622 are further installed between the inner insulating members 611 and 612 and the inner surface of the cap plate 40 to further seal between the inner insulating members 611 and 612 and the cap plate 40. do.
  • the rivet parts 512 and 522 are inserted into the terminal holes H1 and H2 through the gaskets 621 and 622, and the coupling holes of the outer plates 513 and 523 through the external insulating members 631 and 632. After insertion into the 514 and 524, the rivet portions 512 and 522 are fixed to the outer plates 513 and 523 by caulking or welding around the coupling holes 514 and 524. As a result, the electrode terminals 51 and 52 may be installed in the cap plate 40.
  • the rivet parts 512 and 522 are installed in the terminal holes H1 and H2 to protrude out of the cap plate 40. Rivets 512 and 522 are connected to inner plates 511 and 521 on the inside of cap plate 40 and to outer plates 513 and 523 on the outside of cap plate 40. That is, the rivet parts 512 and 522 mechanically and electrically connect the inner plates 511 and 521 and the outer plates 513 and 523 to each other.
  • the inner plates 511 and 521 are integrally formed to be wider than the areas of the rivet portions 512 and 522 and welded to the plain tabs 112 and 122 with a large area, and are located inside the cap plate 40.
  • the non-coated tabs 112 and 122 of the first and second assemblies 101 and 102 are divided into the first tap groups G11 and G21 and the second tap groups G12 and G22, so that The top insulator 20 is bent through the outer surfaces of both ends of the x-axis direction and welded to the inner plates 511 and 521.
  • the electrode assembly 10 that is, the first and second assemblies 101 and 102 may be drawn out of the case 30 through the tabs 112 and 122 and the electrode terminals 51 and 52.
  • the tabs 112 and 122 are directly connected to the electrode terminals 51 and 52, the structure of drawing the electrode assembly 10 out of the case 30 may be simplified.
  • FIG. 6 is an operating state diagram in which a tension is applied to a tab of a plain part by a top insulator.
  • the extension part 21 of the top insulator 20 has a width direction (ie, an end portion of the electrode terminals 51 and 52 in the x-axis direction, that is, an end portion of the inner plate 511 to be described later). in the x-axis direction). Accordingly, the plain tabs 112 and 122 via the extension 21 are tensioned (tensioned) in the x-axis direction.
  • the extension part 21 of the top insulator 20 protrudes with the height difference ⁇ H higher than the lowermost surface of the electrode terminals 51 and 52, that is, the lower surface of the inner plate 511 (z-axis direction). Accordingly, the plain tabs 112 and 122 passing through the extension 21 are tensioned in the z-axis direction.
  • the extension portion 21 of the top insulator 20 has a width difference ⁇ W wider in the width direction (x-axis direction) than the center positions P1 and P2 where the tabs 112 and 122 gather in the electrode assembly 10. Is expanded with). Accordingly, the plain tabs 112 and 122 via the extension 21 are further tensioned in the x-axis direction.
  • the extension 21 of the top insulator 20 has a convex structure toward the electrode assembly 10. Accordingly, the plain tabs 112 and 122 passing through the extension 21 may be connected to the inner plate 511 while being tensioned via the convex outer surface of the extension 21.
  • the top insulator 20 further includes a plate portion 22 disposed on the electrode assembly 10.
  • the expansion part 21 includes a first opening part 211 and a second opening part 212 provided at both sides of the plate part 22 in the width direction (x-axis direction) of the cap plate 40.
  • the first opening portion 211 is convex toward the electrode assembly 10 at the first side (left side of FIGS. 2 and 6 and rearward of FIGS. 3 and 5) in the width direction (x-axis direction) of the plate portion 22. It is formed concave toward the electrode terminals 51 and 52.
  • the second open portion 212 is convex toward the electrode assembly 10 on the second side (the right side of FIGS. 2 and 6 and the front side of FIGS. 3 and 5) opposite to the first side of the plate portion 22 and the electrode terminal. It is formed concave toward 51 and 52.
  • the first tab groups G11 and G21 are formed on the first side (left side of FIG. 2 and the rear side of FIG. 4) in the width direction (x-axis direction), and the expansion portion 21 of the top insulator 20 on the first side, That is, it is bent to the second side via the outer surface of the first opening 211 is connected to the electrode terminals (51, 52).
  • the first tap groups G11 and G21 are tensioned in the x-axis direction (rear) and the z-axis direction (upward) by the first opening part 211.
  • the second tap groups G12 and G22 are formed on the second side (the right side of FIG. 2 and the front of FIG. 4) in the width direction (x-axis direction) opposite to the first tap groups G11 and G21, and the top insulator on the second side. It is bent to the first side via the extension portion 21 of the 20, that is, the second open portion 212, and is connected to the electrode terminals 51 and 52. At this time, the second tap groups G12 and G22 are tensioned in the x-axis direction (rear) and the z-axis direction (upward) by the second opening part 212.
  • FIG. 7 is a partial plan view of a state in which the tabs of the uncoated region are connected to an electrode terminal via a top insulator.
  • the plain tabs 122 of the positive electrode 12 are omitted, and the plain tabs 112 of the negative electrode 11 are described as an example.
  • the non-coating tabs 112 are formed of the first tab group G11 and the second tab group G12, and are connected to the inner plate 511 of the electrode terminal 51.
  • the first tap group G11 and the second tap group G12 are welded to face each other in the welding line WL set on the lower surface of the inner plate 511 in the width direction (x-axis direction).
  • the rivet portion 512 is connected between the end portions of the first tap group G11 and the second tap group G12 on the upper surface of the inner plate 511 corresponding to the welding line WL.
  • the path of the current from the plain tabs 112, that is, the first tab group G11 and the second tab group G12 to the inner plate 511 and the rivet part 512 is formed at the shortest, and thus, the electrode assembly 10 is formed. And unnecessary resistance increase between the electrode terminal 51 can be prevented.
  • the tabs 112 that is, the first tap group G11 and the second tap group G12 have a set length
  • the lengths of the diesel passages are increased by the first and second openings 211 and 212, so that they are tense. State can be maintained.
  • the top insulator 70 is disposed on the extension 71 and the electrode assembly 10 that extend the passage path of the plain tabs 312. It comprises a plate portion 72 disposed in.
  • the expansion portion 71 includes a first circular portion 711 and a second circular portion 712.
  • the first circular portion 711 is set in a direction (zx cross section) that crosses the width direction (x-axis direction) at the first side (left side of FIG. 8) in the width direction (x-axis direction) of the plate portion 72. It is formed into a circular cross section.
  • the second circular portion 712 is formed in a circular cross section set in the direction (zx cross section) that intersects on the second side (right side in FIG. 8), which is the opposite side of the first side of the plate portion 72.
  • the first and second circular portions 711 and 712 of the top insulator 70 protrude with the height difference ⁇ H2 higher than the lowermost surface of the electrode terminal 51, that is, the lower surface of the inner plate 511 (z Axial direction). Accordingly, the plain tabs 312 passing through the first and second circular portions 711 and 712 are tensioned in the z-axis direction.
  • the first and second circular portions 711 and 712 of the top insulator 70 are further in the width direction (x-axis direction) than the central positions P1 and P2 where the tabs 312 are assembled in the electrode assembly 10. Wide with a width difference ⁇ W2. Accordingly, the plain tabs 312 via the first and second circular portions 711 and 712 are further tensioned in the x-axis direction.
  • the first and second circular portions 711 and 712 have a convex structure toward the electrode assembly 10. Accordingly, the plain tabs 312 passing through the first and second circular portions 711 and 712 of the top insulator 70 are tensioned through the convex outer surfaces of the first and second circular portions 711 and 712. It may be connected to the plate 511.
  • the first tab group G31 is formed in the width direction (x-axis direction) on the first side (left side in FIG. 8) via the expansion portion 71 of the top insulator 70, that is, the outer surface of the first circular portion 711. It is bent to two sides and connected to the inner plate 511 of the electrode terminal 51. At this time, the first tap group G31 is tensioned in the x-axis direction (rear) and the z-axis direction (upward) by the first circular portion 711.
  • the second tap group G32 is an extension 71 of the top insulator 70, that is, a second circular part, on the second side (right side of FIG. 8) in the width direction (x-axis direction) opposite to the first tap group G31. It is bent to the first side via the outer surface of the 712 is connected to the inner plate 511 of the electrode terminal 51. At this time, the second tab group G32 is tensioned in the x-axis direction (rear) and the z-axis direction (upward) by the second circular portion 712.
  • the plain tabs 312, that is, the first tap group G31 and the second tab group G32 have a set length, and thus the length of the diesel passage is increased by the first and second circular parts 711 and 712, so that the tension is increased. Can be maintained.
  • the tabs 312 are not folded.
  • the plain tabs 312, which remain in tension even when the electrode assembly 10 is inserted into the case 30, are not in contact with the negative and positive electrodes 11 and 12. That is, short circuits and cell events caused by the uncoated tabs 312 can be prevented.
  • electrode assembly 11 first electrode (cathode)
  • vent hole 42 electrolyte injection hole
  • H1 Terminal hole P1, P2: Center position
  • ⁇ H, ⁇ H2 height difference ⁇ W, ⁇ W2: width difference

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Abstract

A rechargeable battery according to an embodiment of the present invention comprises: an electrode assembly formed by arranging electrodes, each having a coated part and uncoated part taps, at respective opposite sides of a separator; a case for receiving the electrode assembly; a cap plate coupled to an opening of the case; a top insulator disposed between the electrode assembly and the cap plate; and an electrode terminal installed on a terminal hole of the cap plate and connected to the uncoated part taps passing via an outside of the top insulator in the width direction of the cap plate, wherein the top insulator includes an expanding part which expands from at least one width-directional end part of the cap plate in such a direction as to increase the path via which the uncoated part taps pass.

Description

이차 전지Secondary battery
본 기재는 이차 전지에 관한 것으로서, 보다 상세하게는 전극 조립체를 복수의 무지부 탭들로 전극단자에 연결하는 이차 전지에 관한 것이다.The present disclosure relates to a secondary battery, and more particularly, to a secondary battery connecting an electrode assembly with a plurality of plain 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 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 for drawing the electrode assembly out of the cap plate.
전극 조립체는 하나의 케이스에 하나씩 수용될 수도 있으나, 복수로 구비되어 케이스에 수용될 수도 있다. 전극단자와 전극 조립체 사이에 개재되는 탑 인슐레이터는 전극 조립체와 캡 플레이트를 전기적으로 절연시킨다. 그리고 전극 조립체에 연결되는 무지부 탭들은 탑 인슐레이터의 측면을 돌아서 전극단자에 용접으로 연결된다.One electrode assembly may be accommodated in one case, but a plurality of electrode assemblies may be provided and accommodated in the case. A top insulator interposed between the electrode terminal and the electrode assembly electrically insulates the electrode assembly from the cap plate. The plain tabs connected to the electrode assembly are then welded to the electrode terminals by turning the side of the top insulator.
무지부 탭들은 전극단자와 전극 조립체 사이에서 느슨한 구조를 가진다. 따라서 캡 플레이트와 일체로 연결된 전극 조립체를 케이스에 삽입하는 과정에서, 무지부 탭들이 케이스의 개구에서 접히게 되고, 접힌 상태로 케이스 내부로 삽입되어 케이스 내부에서 서로 다른 전극에 접촉될 수 있다. 즉 무지부 탭들은 단락(short circuit) 및 셀 이벤트(cell event)를 발생시킬 수 있다.The uncoated tabs have a loose structure between the electrode terminal and the electrode assembly. Accordingly, in the process of inserting the electrode assembly integrally connected with the cap plate to the case, the tabs of the uncoated portion may be folded in the opening of the case, and may be inserted into the case in a folded state to contact different electrodes in the case. That is, the uncoated taps may generate a short circuit and a cell event.
본 발명의 일 측면은 무지부 탭들의 접힘을 방지하고, 케이스 내부에서 무지부 탭들에 의한 단락 및 셀 이벤트를 방지하는 이차 전지를 제공하는 것이다.One aspect of the present invention is to provide a rechargeable battery that prevents folding of tab paper tabs and prevents short circuits and cell events caused by paper tabs in a case.
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 결합되는 캡 플레이트, 상기 전극 조립체와 상기 캡 플레이트 사이에 배치되는 탑 인슐레이터, 및 상기 캡 플레이트의 단자홀에 설치되고 상기 캡 플레이트의 폭 방향에서 상기 탑 인슐레이터의 외측을 경유하는 상기 무지부 탭들에 연결되는 전극단자를 포함하며, 상기 탑 인슐레이터는 상기 캡 플레이트의 폭 방향의 적어도 일측 단부에서 상기 무지부 탭들의 경유 경로를 증대시키는 방향으로 확장되는 확장부를 포함한다.According to an exemplary 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 cap plate coupled to the opening of the case. A top insulator disposed between the electrode assembly and the cap plate, and an electrode terminal installed in the terminal hole of the cap plate and connected to the plain tabs passing through an outer side of the top insulator in a width direction of the cap plate. And the top insulator includes an extension that extends in a direction of increasing a passage path of the plain tabs at at least one end of the cap plate in a width direction.
상기 전극 조립체는 상기 폭 방향으로 나란하게 배치되는 제1조립체와 제2조립체를 포함하며, 상기무지부 탭들은 상기 제1조립체의 전극들에 연결되는 제1탭군과 상기 제2조립체의 전극들에 연결되는 제2탭군을 포함할 수 있다.The electrode assembly may include a first assembly and a second assembly arranged side by side in the width direction, and the uncoated tabs may be connected to the first tab group and the electrodes of the second assembly connected to the electrodes of the first assembly. It may include a second tap group to be connected.
상기 탑 인슐레이터는 상기 전극 조립체 상에 배치되는 플레이트부를 더 포함하며, 상기 확장부는 상기 플레이트부의 상기 폭 방향의 제1측에서 상기 전극 조립체를 향하여 볼록하고 상기 전극단자를 향하여 오목하게 형성되는 제1개방부, 및 상기 플레이트부의 상기 제1측의 반대측인 제2측에서 상기 전극 조립체를 향하여 볼록하고 상기 전극단자를 향하여 오목하게 형성되는 제2개방부를 포함할 수 있다.The top insulator further includes a plate portion disposed on the electrode assembly, wherein the expansion portion is a first opening which is convex toward the electrode assembly and concave toward the electrode terminal on the first side of the plate portion in the width direction. And a second open portion that is convex toward the electrode assembly and concave toward the electrode terminal at a second side opposite to the first side of the plate portion.
상기 제1탭군은 상기 제1측에서 상기 제1개방부의 외면을 경유하여 상기 제2측으로 휘어져 상기 전극단자에 연결되고, 상기 제2탭군은 상기제2측에서 상기 제2개방부의 외면을 경유하여 상기 제1측으로 휘어져 상기 전극단자에 연결될 수 있다.The first tab group is bent to the second side via the outer surface of the first opening portion at the first side and connected to the electrode terminal, and the second tab group is connected to the electrode terminal at the second side via the outer surface of the second opening portion. The first side may be bent and connected to the electrode terminal.
상기 전극단자는 상기 단자홀에 설치되는 리벳부, 상기 캡 플레이트의 외측에 배치되어 상기 리벳부에 연결되는 외부 플레이트, 및 상기 캡 플레이트의 내측에 배치되어 상기 리벳부에 연결되는 내부 플레이트를 포함하며, 상기 제1탭군과 상기 제2탭군은 상기 내부 플레이트에 용접될 수 있다.The electrode terminal includes a rivet portion installed in the terminal hole, an outer plate disposed outside the cap plate and connected to the rivet portion, and an inner plate disposed inside the cap plate and connected to the rivet portion, The first tab group and the second tab group may be welded to the inner plate.
상기 제1탭군과 상기 제2탭군은 상기 폭 방향에서 상기 내부플레이트의 하면에 설정되는 용접 라인에서 마주하여 용접되고, 상기 리벳부는 상기 용접 라인에 대응하는 상기 내부 플레이트의 상면에서 상기 제1탭군과 상기 제2탭군의 단부 사이에 연결될 수 있다.The first tab group and the second tab group are welded to face each other in a welding line set on a lower surface of the inner plate in the width direction, and the rivet part is formed on the upper surface of the inner plate corresponding to the welding line. It may be connected between the ends of the second tab group.
상기 확장부는 상기 전극단자의 단부보다 상기 폭 방향으로 더 확장될 수 있다.The extension part may be further extended in the width direction than an end of the electrode terminal.
상기 확장부는 상기 전극단자의 최하면 보다 더 높게 높이 차를 가지고 돌출될 수 있다.The extension part may protrude with a height difference higher than the bottom of the electrode terminal.
상기 확장부는 상기 전극 조립체에서 상기 무지부 탭들이 모이는 중심 위치보다 상기 폭 방향으로 더 넓게 너비 차를 가지고 확장될 수 있다.The extension part may be extended with a width difference wider in the width direction than a center position where the plain tabs gather in the electrode assembly.
상기 확장부는 상기 전극 조립체를 향하여 볼록한 구조를 가질 수 있다.The extension part may have a convex structure toward the electrode assembly.
상기 탑 인슐레이터는 상기 전극 조립체 상에 배치되는 플레이트부를 더 포함하며, 상기 확장부는 상기 플레이트부의 상기 폭 방향의 제1측에서 상기 폭 방향에 교차하는 방향으로 설정되는 원형 단면으로 형성되는 제1원형부, 및 상기 플레이트부의 상기 제1측의 반대측인 제2측에서 상기 교차하는 방향으로 설정되는 원형 단면으로 형성되는 제2원형부를 포함할 수 있다.The top insulator further includes a plate portion disposed on the electrode assembly, wherein the expansion portion is formed in a circular cross section set in a direction crossing the width direction on the first side of the width direction of the plate portion. And a second circular portion formed in a circular cross section set in the crossing direction on the second side opposite to the first side of the plate portion.
상기 제1탭군은 상기 제1측에서 상기 제1원형부의 외면을 경유하여 상기 제2측으로 휘어져 상기 전극단자에 연결되고, 상기 제2탭군은 상기제2측에서 상기 제2원형부의 외면을 경유하여 상기 제1측으로 휘어져 상기 전극단자에 연결될 수 있다.The first tab group is bent to the second side via the outer surface of the first circular portion at the first side and connected to the electrode terminal, and the second tab group is connected to the electrode terminal at the second side via the outer surface of the second circular portion. The first side may be bent and connected to the electrode terminal.
본 발명의 일 실시예에 따르면, 전극 조립체의 무지부 탭들이 탑 인슐레이터의 단부(폭 방향의 단부)에 구비되는 확장부를 경유하여 전극단자에 연결되므로 확장부에 의하여 무지부 탭들의 경로가 증대된다. 즉 무지부 탭들이 장력을 받게 되어 팽팽하게 당겨진 긴장상태가 된다.According to an embodiment of the present invention, since the tabs of the uncoated region of the electrode assembly are connected to the electrode terminal via an extended portion provided at the end (width end) of the top insulator, the path of the uncoated region tabs is increased by the expanded portion. . That is, the tabs of the uncoated area are tensioned and are in a tension state where the tension is pulled.
따라서 긴장된 무지부 탭들은 전극 조립체를 케이스 내에 삽입하는 경우에도 접히지 않게 되고, 케이스 내부에 삽입된 상태에서도 다른 전극과 접촉되지 않을 수 있게 된다. 즉 무지부 탭들에 의한 단락 및 셀 이벤트가 방지될 수 있다.Thus, the tensioned tab tabs do not fold even when the electrode assembly is inserted into the case and may not come into contact with other electrodes even when inserted into the case. That is, short circuits and cell events caused by the uncoated tabs can be prevented.
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 3은 도 1의 Ⅲ-Ⅲ 선을 따라 자른 단면도이다.3 is a cross-sectional view taken along line III-III of FIG. 1.
도 4는 도 2에 적용된 전극 조립체의 사시도이다.4 is a perspective view of an electrode assembly applied to FIG. 2.
도 5는 도 2에 적용되는 탑 인슐레이터를 개재하여 전극 조립체에 전극단자를 연결한 상태의 사시도이다.5 is a perspective view of a state in which electrode terminals are connected to an electrode assembly via a top insulator applied to FIG. 2.
도 6은 탑 인슐레이터에 의하여 무지부 탭에 긴장(tension)을 부여하는 작동 상태도이다.6 is an operating state diagram in which a tension is applied to a tab of a plain part by a top insulator.
도 7은 탑 인슐레이터를 개재하여 전극단자에 무지부 탭들을 연결한 상태의 부분 평면도이다.7 is a partial plan view of a state in which the tabs of the uncoated region are connected to an electrode terminal via a top insulator.
도 8은 본 발명의 제2실시예에 따른 이차 전지의 단면도이다.8 is a cross-sectional view of a rechargeable battery according to a second 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.
도 1은 본 발명의 제1실시예에 따른 이차 전지의 사시도이고, 도 2는 도 1의 Ⅱ-Ⅱ 선을 따라 자른 단면도이며, 도 3은 도 1의 Ⅲ-Ⅲ 선을 따라 자른 단면도이다.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, and FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1.
도 1 내지 도 3을 참조하면, 제1실시예에 따른 이차 전지(100)는 전류를 충전 및 방전하는 전극 조립체(10), 전극 조립체(10)를 내장하는 케이스(30), 케이스(30)의 개구(31)에 결합되는 캡 플레이트(40), 전극 조립체(10)와 캡 플레이트(40) 사이에 배치되는 탑 인슐레이터(20), 및 전극단자(51, 52)를 포함한다.1 to 3, the secondary battery 100 according to the first embodiment includes an electrode assembly 10 for charging and discharging current, a case 30 in which the electrode assembly 10 is embedded, and a case 30. A cap plate 40 coupled to the opening 31 of the top plate, a top insulator 20 disposed between the electrode assembly 10 and the cap plate 40, and electrode terminals 51 and 52.
케이스(30)는 플레이트 모양의 전극 조립체(10)를 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.The case 30 sets a space to accommodate the plate-shaped electrode assembly 10. 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.
캡 플레이트(40)는 케이스(30)의 개구(31)에 결합되어 케이스(30)를 밀폐하고, 2개의 단자홀(H1, H2)을 구비한다. 예를 들면, 단자홀(H1, H2)에는 전극단자(51, 52)가 설치된다. 일례로써, 케이스(30)와 캡 플레이트(40)는 알루미늄으로 형성되어 개구(31)에서 서로 용접될 수 있다.The cap plate 40 is coupled to the opening 31 of the case 30 to seal the case 30 and includes two terminal holes H1 and H2. For example, electrode terminals 51 and 52 are provided in the terminal holes H1 and H2. As an example, the case 30 and the cap plate 40 may be made of aluminum and welded to each other at the opening 31.
또한, 캡 플레이트(40)는 벤트홀(41)과 전해액 주입구(42)를 더 구비한다. 벤트홀(41)은 전극 조립체(10)의 충전 및 방전 작용에 의하여 이차 전지(100)의 내부에서 발생되는 가스에 의한 내부 압력을 배출할 수 있도록 벤트 플레이트(411)로 밀폐된다.In addition, the cap plate 40 further includes a vent hole 41 and an electrolyte injection hole 42. The vent hole 41 is sealed by the vent plate 411 to discharge the internal pressure caused by the gas generated inside the secondary battery 100 by the charging and discharging action of the electrode assembly 10.
이차 전지(100)의 내부 압력이 설정 압력에 이르면, 벤트 플레이트(411)가 절개되어 벤트홀(41)을 개방하여 과충전으로 발생되는 가스 및 내부 압력을 배출한다. 벤트 플레이트(411)는 절개를 유도하는 노치(412)를 가진다.When the internal pressure of the secondary battery 100 reaches the set pressure, the vent plate 411 is cut to open the vent hole 41 to discharge the gas and the internal pressure generated by overcharging. Vent plate 411 has a notch 412 leading to an incision.
전해액 주입구(42)는 케이스(30)에 캡 플레이트(40)를 결합 및 용접한 후, 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 and welds the cap plate 40 to the case 30, and then injects the electrolyte into the case 30. After electrolyte injection, the electrolyte injection port 42 is sealed with a sealing stopper 421.
탑 인슐레이터(20)는 전기 절연재로 형성되어, 전극 조립체(10)와 캡 플레이트(40) 사이에 배치되므로 전극 조립체(10)와 캡 플레이트(40)를 전기적으로 절연시킨다.The top insulator 20 is formed of an electrical insulating material and is disposed between the electrode assembly 10 and the cap plate 40 to electrically insulate the electrode assembly 10 and the cap plate 40.
탑 인슐레이터(20)는 내부 벤트홀(27)을 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. 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.
탑 인슐레이터(20)는 내부 전해액 주입구(28)를 구비한다. 내부 전해액 주입구(28)는 캡 플레이트(40)에 구비되는 전해액 주입구(42)에 대응하여 형성되므로 전해액 주입구(42)를 경유한 전해액이 탑 인슐레이터(20)의 내부로 원활히 주입될 수 있게 한다.The top insulator 20 has an internal electrolyte injection hole 28. 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 4는 도 2에 적용된 전극 조립체의 사시도이다. 도 2 및 도 4를 참조하면, 전극 조립체(10)는 전기 절연재인 세퍼레이터(13)의 양측에 제1전극(11, 예를 들면, 음극)과 제2전극(12, 예를 들면 양극)을 구비하고, 음극(11), 세퍼레이터(13) 및 양극(12)을 접합하여 형성된다. 도시하지 않았으나, 전극 조립체는 음극, 세퍼레이터 및 양극을 권취 또는 적층하여 형성될 수도 있다.4 is a perspective view of an electrode assembly applied to FIG. 2. 2 and 4, the electrode assembly 10 includes a first electrode 11 (eg, a cathode) and a second electrode 12 (eg, an anode) on both sides of the separator 13, which is an electrical insulation material. And the cathode 11, the separator 13, and the anode 12 are formed by joining. Although not shown, the electrode assembly may be formed by winding or stacking the cathode, the separator, and the anode.
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 전극 조립체(10)의 일단에 배치되고, 전극 조립체(10)의 폭 범위(T) 내에서 거리(D)를 두고 서로 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 uncoated tabs 112 and 122 are disposed at one end of the electrode assembly 10 and are disposed to each other at a distance D within the width range T of the electrode assembly 10.
즉 음극(11)의 무지부 탭들(112)은 전극 조립체(10)의 일단(도 4의 상단)에서 일측(도 4의 좌측)에 배치되고, 양극(12)의 무지부 탭들(122)은 전극 조립체(10)의 동일단(도 4의 상단)에서 거리(D)를 두고 다른 측(도 4의 우측)에 서로 배치된다.That is, the plain tabs 112 of the negative electrode 11 are disposed at one side (the left side of FIG. 4) at one end of the electrode assembly 10 (the top of FIG. 4), and the plain tabs 122 of the positive electrode 12 are At the same end of the electrode assembly 10 (top of FIG. 4), the distance D is disposed on the other side (right side of FIG. 4).
이와 같이, 음, 양극(11, 12)에서 코팅부(111, 121)의 면적이 최대로 넓어지고, 무지부 탭들(112, 122)에 의하여 무지부의 면적이 최소로 좁아짐에 따라 전극 조립체(10)의 충전 용량이 증대될 수 있다.As described above, the area of the coating parts 111 and 121 in the anodes 11 and 12 is maximized, and the area of the plain parts is narrowed to the minimum by the plain tabs 112 and 122. ) Can be increased in capacity.
전극 조립체(10)는 하나로 형성될 수도 있으나(미도시) 제1실시예에서 2개로 형성되어 있다. 즉 전극 조립체(10)는 캡 플레이트(40)의 폭 방향(x축 방향)으로 나란하게 배치되는 제1조립체(101)와 제2조립체(102)를 포함한다. 또한 제1, 제2조립체(101, 102)는 대략 직육면체 형상의 케이스(30)에 수용될 수 있도록 y축 방향의 양단에서 반원을 형성하는 플레이트 모양으로 형성될 수 있다.The electrode assembly 10 may be formed as one (not shown) but is formed in two in the first embodiment. 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. In addition, the first and second assemblies 101 and 102 may be formed in a plate shape to form semicircles at both ends in the y-axis direction so as to be accommodated in the case 30 having a substantially rectangular parallelepiped shape.
도 5는 도 2에 적용되는 탑 인슐레이터를 개재하여 전극 조립체에 전극단자를 연결한 상태의 사시도이다. 도 2 내지 도 5를 참조하면, 전극 조립체(10), 즉 제1, 제2조립체(101, 102)는 병렬로 배치된다. 5 is a perspective view of a state in which electrode terminals are connected to an electrode assembly via a top insulator applied to FIG. 2. 2 to 5, the electrode assembly 10, that is, the first and second assemblies 101 and 102 are arranged in parallel.
전극단자(51, 52)는 캡 플레이트(40)의 단자홀(H1, H2)에 각각 설치되어, 각각의 무지부 탭(112, 122)을 통하여 제1, 제2조립체(101, 102)에 전기적으로 연결된다.Electrode terminals (51, 52) are respectively provided in the terminal holes (H1, H2) of the cap plate 40, the respective first and second assemblies (101, 102) through the uncoated tabs (112, 122) Electrically connected.
무지부 탭들(112, 122)은 복수의 군으로 형성될 수 있다. 무지부 탭들(112, 122)은 캡 플레이트(40)의 폭 방향(x축 방향)에서 탑 인슐레이터(20)의 적어도 일측 단부에 구비되는 확장부(21)를 경유하여 전극단자(51, 52)에 연결된다. 따라서 확장부(21)에 의하여, 설정된 길이를 가지는 무지부 탭들(112, 122)의 경유 경로가 길어진다.The uncoated tabs 112 and 122 may be formed in a plurality of groups. The non-coating tabs 112 and 122 are electrode terminals 51 and 52 via an extension part 21 provided at at least one end of the top insulator 20 in the width direction (x-axis direction) of the cap plate 40. Is connected to. Therefore, the extension part 21 lengthens the route through the plain tabs 112 and 122 having the set length.
제1실시예에서 무지부 탭들(112, 122)은 제1탭군(G11, G21)과 제2탭군(G12, G22)을 포함한다. 제1탭군(G11, G21)은 제1조립체(101)의 제1, 제2전극들(11, 12)에 각각 연결되고, 제2탭군(G12, G22)은 제2조립체(102)의 제1, 제2전극들(11, 12)에 각각 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 first and second electrodes 11 and 12 of the first assembly 101, respectively, and the second tap groups G12 and G22 are formed of the second assembly 102. The first and second electrodes 11 and 12 are respectively connected.
전극단자(51, 52)는 제1, 제2조립체(101, 102)로부터 전류를 방전시키거나 제1, 제2조립체(101, 102)에 전류를 충전시킬 수 있도록 무지부 탭(112, 122)에 각각 연결된다.The electrode terminals 51 and 52 may discharge the current from the first and second assemblies 101 and 102 or the non-coating tabs 112 and 122 to charge the current to the first and second assemblies 101 and 102. Respectively).
전극단자(51, 52)는 동일 구조로 형성될 수 있다. 도 1 내지 도 3을 참조하여 설명하면, 전극단자(51, 52)는 리벳부(512, 522)와 내부 플레이트(511, 521) 및 외부 플레이트(513, 523)를 포함한다. 전극단자(51, 52)는 캡 플레이트(40) 내면과의 사이에 내부 절연부재(611, 612)와 개스킷(621, 622)을 개재하여, 캡 플레이트(40)와 전기적으로 절연된다.The electrode terminals 51 and 52 may be formed in the same structure. 1 to 3, the electrode terminals 51 and 52 include rivet parts 512 and 522, inner plates 511 and 521, and outer plates 513 and 523. The electrode terminals 51 and 52 are electrically insulated from the cap plate 40 through the inner insulating members 611 and 612 and the gaskets 621 and 622 between the inner surface of the cap plate 40.
내부 절연부재(611, 612)는 일측으로 캡 플레이트(40)에 밀착되고 다른 일측으로 전극단자(51, 52)의 내부 플레이트(511, 521)와 리벳부(512, 522) 일부를 감싸므로 전극단자(51, 52)와 무지부 탭(112, 122)의 연결 구조를 안정시킨다.The inner insulation members 611 and 612 are in close contact with the cap plate 40 on one side and surround the inner plates 511 and 521 and the rivet portions 512 and 522 of the electrode terminals 51 and 52 on one side thereof. The connection structure between the terminals 51 and 52 and the plain tabs 112 and 122 is stabilized.
개스킷(621, 622)은 전극단자(51, 52)의 리벳부(512, 522)와 캡 플레이트(40)의 단자홀(H1, H2) 내면 사이에 설치되어, 리벳부(512, 522)와 캡 플레이트(40)의 단자홀(H1, H2) 사이를 실링하고 전기적으로 절연한다.The gaskets 621 and 622 are provided between the rivet parts 512 and 522 of the electrode terminals 51 and 52 and the inner surfaces of the terminal holes H1 and H2 of the cap plate 40. The terminal plates H1 and H2 of the cap plate 40 are sealed and electrically insulated.
또한, 개스킷(621, 622)은 내부 절연부재(611, 612)와 캡 플레이트(40)의 내면 사이에 더 연장 설치되어, 내부 절연부재(611, 612)와 캡 플레이트(40) 사이를 더욱 실링한다.In addition, the gaskets 621 and 622 are further installed between the inner insulating members 611 and 612 and the inner surface of the cap plate 40 to further seal between the inner insulating members 611 and 612 and the cap plate 40. do.
개스킷(621, 622)을 개재하여 리벳부(512, 522)를 단자홀(H1, H2)에 삽입하고, 외부 절연부재(631, 632)를 개재하여 외부 플레이트(513, 523)의 결합홀(514, 524)에 삽입한 후, 결합홀(514, 524)의 주위를 코킹(caulking) 또는 용접함으로써, 리벳부(512, 522)가 외부 플레이트(513, 523)에 고정된다. 이로써 전극단자(51, 52)가 캡 플레이트(40)에 설치될 수 있다.The rivet parts 512 and 522 are inserted into the terminal holes H1 and H2 through the gaskets 621 and 622, and the coupling holes of the outer plates 513 and 523 through the external insulating members 631 and 632. After insertion into the 514 and 524, the rivet portions 512 and 522 are fixed to the outer plates 513 and 523 by caulking or welding around the coupling holes 514 and 524. As a result, the electrode terminals 51 and 52 may be installed in the cap plate 40.
이와 같이, 리벳부(512, 522)는 단자홀(H1, H2)에 설치되어 캡 플레이트(40)의 외부로 돌출된다. 리벳부(512, 522)는 캡 플레이트(40)의 내측에서 내부 플레이트(511, 521)에 연결되고, 캡 플레이트(40)의 외측에서 외부 플레이트(513, 523)에 연결된다. 즉 리벳부(512, 522)는 내부 플레이트(511, 521)와 외부 플레이트(513, 523)를 기계적 및 전기적으로 서로 연결한다.As such, the rivet parts 512 and 522 are installed in the terminal holes H1 and H2 to protrude out of the cap plate 40. Rivets 512 and 522 are connected to inner plates 511 and 521 on the inside of cap plate 40 and to outer plates 513 and 523 on the outside of cap plate 40. That is, the rivet parts 512 and 522 mechanically and electrically connect the inner plates 511 and 521 and the outer plates 513 and 523 to each other.
내부 플레이트(511, 521)는 리벳부(512, 522)의 면적보다 넓게 일체로 형성되어 무지부 탭(112, 122)에 넓은 면적으로 용접되고, 캡 플레이트(40)의 내부에 위치한다.The inner plates 511 and 521 are integrally formed to be wider than the areas of the rivet portions 512 and 522 and welded to the plain tabs 112 and 122 with a large area, and are located inside the cap plate 40.
이때, 제1, 제2조립체(101, 102)의 무지부 탭(112, 122)은 제1탭군(G11, G21)과 제2탭군(G12, G22)으로 나누어져서 제1, 제2측에서 탑 인슐레이터(20)의 x축 방향 양단의 외면을 경유하여 휘어져서 내부 플레이트(511, 521)에 용접된다.At this time, the non-coated tabs 112 and 122 of the first and second assemblies 101 and 102 are divided into the first tap groups G11 and G21 and the second tap groups G12 and G22, so that The top insulator 20 is bent through the outer surfaces of both ends of the x-axis direction and welded to the inner plates 511 and 521.
따라서 전극 조립체(10), 즉 제1, 제2조립체(101, 102)는 무지부 탭(112, 122) 및 전극단자(51, 52)를 통하여 케이스(30)의 외부로 인출될 수 있다. 또한 무지부 탭(112, 122)이 전극단자(51, 52)에 직접 연결되므로 전극 조립체(10)를 케이스(30) 외부로 인출하는 구조가 간단해질 수 있다.Accordingly, the electrode assembly 10, that is, the first and second assemblies 101 and 102 may be drawn out of the case 30 through the tabs 112 and 122 and the electrode terminals 51 and 52. In addition, since the tabs 112 and 122 are directly connected to the electrode terminals 51 and 52, the structure of drawing the electrode assembly 10 out of the case 30 may be simplified.
도 6은 탑 인슐레이터에 의하여 무지부 탭에 긴장(tension)을 부여하는 작동 상태도이다. 도 2 내지 도 6을 참조하면, 탑 인슐레이터(20)의 확장부(21)는 x축 방향에서 전극단자(51, 52)의 단부, 즉 후술하게 되는 내부 플레이트(511)의 단부보다 폭 방향(x축 방향)으로 더 확장된다. 따라서 확장부(21)를 경유하는 무지부 탭(112, 122)은 x축 방향으로 긴장된다(장력이 부여된다).6 is an operating state diagram in which a tension is applied to a tab of a plain part by a top insulator. 2 to 6, the extension part 21 of the top insulator 20 has a width direction (ie, an end portion of the electrode terminals 51 and 52 in the x-axis direction, that is, an end portion of the inner plate 511 to be described later). in the x-axis direction). Accordingly, the plain tabs 112 and 122 via the extension 21 are tensioned (tensioned) in the x-axis direction.
탑 인슐레이터(20)의 확장부(21)는 전극단자(51, 52)의 최하면, 즉 내부 플레이트(511)의 하면보다 더 높게 높이 차(ΔH)를 가지고 돌출된다(z축 방향). 따라서 확장부(21)를 경유하는 무지부 탭(112, 122)은 z축 방향으로 긴장된다.The extension part 21 of the top insulator 20 protrudes with the height difference ΔH higher than the lowermost surface of the electrode terminals 51 and 52, that is, the lower surface of the inner plate 511 (z-axis direction). Accordingly, the plain tabs 112 and 122 passing through the extension 21 are tensioned in the z-axis direction.
탑 인슐레이터(20)의 확장부(21)는 전극 조립체(10)에서 무지부 탭들(112, 122)이 모이는 중심 위치(P1, P2)보다 폭 방향(x축 방향)으로 더 넓게 너비 차(ΔW)를 가지고 확장된다. 따라서 확장부(21)를 경유하는 무지부 탭(112, 122)은 x축 방향으로 더 긴장된다.The extension portion 21 of the top insulator 20 has a width difference ΔW wider in the width direction (x-axis direction) than the center positions P1 and P2 where the tabs 112 and 122 gather in the electrode assembly 10. Is expanded with). Accordingly, the plain tabs 112 and 122 via the extension 21 are further tensioned in the x-axis direction.
탑 인슐레이터(20)의 확장부(21)는 전극 조립체(10)를 향하여 볼록한 구조를 가진다. 따라서 확장부(21)를 경유하는 무지부 탭(112, 122)은 확장부(21)의 볼록한 외면을 경유하여 긴장되면서 내부 플레이트(511)에 연결될 수 있다.The extension 21 of the top insulator 20 has a convex structure toward the electrode assembly 10. Accordingly, the plain tabs 112 and 122 passing through the extension 21 may be connected to the inner plate 511 while being tensioned via the convex outer surface of the extension 21.
탑 인슐레이터(20)는 전극 조립체(10) 상에 배치되는 플레이트부(22)를 더 포함한다. 확장부(21)는 캡 플레이트(40)의 폭 방향(x축 방향)에서 플레이트부(22)의 양측에 구비되는 제1개방부(211)와 제2개방부(212)를 포함한다. The top insulator 20 further includes a plate portion 22 disposed on the electrode assembly 10. The expansion part 21 includes a first opening part 211 and a second opening part 212 provided at both sides of the plate part 22 in the width direction (x-axis direction) of the cap plate 40.
제1개방부(211)는 플레이트부(22)의 폭 방향(x축 방향)의 제1측(도 2, 6의 좌측 및 도 3, 5의 후방)에서 전극 조립체(10)를 향하여 볼록하고, 전극단자(51, 52)를 향하여 오목하게 형성된다.The first opening portion 211 is convex toward the electrode assembly 10 at the first side (left side of FIGS. 2 and 6 and rearward of FIGS. 3 and 5) in the width direction (x-axis direction) of the plate portion 22. It is formed concave toward the electrode terminals 51 and 52.
제2개방부(212)는 플레이트부(22)의 제1측의 반대측인 제2측(도 2, 6의 우측 및 도 3, 5의 전방)에서 전극 조립체(10)를 향하여 볼록하고 전극단자(51, 52)를 향하여 오목하게 형성된다.The second open portion 212 is convex toward the electrode assembly 10 on the second side (the right side of FIGS. 2 and 6 and the front side of FIGS. 3 and 5) opposite to the first side of the plate portion 22 and the electrode terminal. It is formed concave toward 51 and 52.
제1탭군(G11, G21)은 폭 방향(x축 방향) 제1측(도 2의 좌측 및 도 4의 후방)에 형성되어, 제1측에서 탑 인슐레이터(20)의 확장부(21), 즉 제1개방부(211)의 외면을 경유하여 제2측으로 휘어져 전극단자(51, 52)에 연결된다. 이때, 제1탭군(G11, G21)은 제1개방부(211)에 의하여 x축 방향(후방) 및 z축 방향(상방)으로 긴장된다.The first tab groups G11 and G21 are formed on the first side (left side of FIG. 2 and the rear side of FIG. 4) in the width direction (x-axis direction), and the expansion portion 21 of the top insulator 20 on the first side, That is, it is bent to the second side via the outer surface of the first opening 211 is connected to the electrode terminals (51, 52). At this time, the first tap groups G11 and G21 are tensioned in the x-axis direction (rear) and the z-axis direction (upward) by the first opening part 211.
제2탭군(G12, G22)은 제1탭군(G11, G21)의 반대측인 폭 방향(x축 방향) 제2측(도 2의 우측 및 도 4의 전방)에 형성되어 제2측에서 탑 인슐레이터(20)의 확장부(21), 즉 제2개방부(212)의 외면을 경유하여 제1측으로 휘어져 전극단자(51, 52)에 연결된다. 이때, 제2탭군(G12, G22)은 제2개방부(212)에 의하여 x축 방향(후방) 및 z축 방향(상방)으로 긴장된다.The second tap groups G12 and G22 are formed on the second side (the right side of FIG. 2 and the front of FIG. 4) in the width direction (x-axis direction) opposite to the first tap groups G11 and G21, and the top insulator on the second side. It is bent to the first side via the extension portion 21 of the 20, that is, the second open portion 212, and is connected to the electrode terminals 51 and 52. At this time, the second tap groups G12 and G22 are tensioned in the x-axis direction (rear) and the z-axis direction (upward) by the second opening part 212.
도 7은 탑 인슐레이터를 개재하여 전극단자에 무지부 탭들을 연결한 상태의 부분 평면도이다. 도 7을 참조하면, 편의상, 양극(12)의 무지부 탭들(122)을 생략하고, 음극(11)의 무지부 탭들(112)을 예로써 설명한다. 무지부 탭들(112)은 제1탭군(G11)과 제2탭군(G12)으로 형성되어, 전극단자(51)의 내부 플레이트(511)에 연결된다.7 is a partial plan view of a state in which the tabs of the uncoated region are connected to an electrode terminal via a top insulator. Referring to FIG. 7, for convenience, the plain tabs 122 of the positive electrode 12 are omitted, and the plain tabs 112 of the negative electrode 11 are described as an example. The non-coating tabs 112 are formed of the first tab group G11 and the second tab group G12, and are connected to the inner plate 511 of the electrode terminal 51.
제1탭군(G11)과 제2탭군(G12)은 폭 방향(x축 방향)에서 내부 플레이트(511)의 하면에 설정되는 용접 라인(WL)에서 서로 마주하여 용접된다. 리벳부(512)는 용접 라인(WL)에 대응하는 내부 플레이트(511)의 상면에서 제1탭군(G11)과 제2탭군(G12)의 단부 사이에 연결된다.The first tap group G11 and the second tap group G12 are welded to face each other in the welding line WL set on the lower surface of the inner plate 511 in the width direction (x-axis direction). The rivet portion 512 is connected between the end portions of the first tap group G11 and the second tap group G12 on the upper surface of the inner plate 511 corresponding to the welding line WL.
따라서 무지부 탭들(112), 즉 제1탭군(G11)과 제2탭군(G12)에서 내부 플레이트(511) 및 리벳부(512)로 이어지는 전류의 경로가 최단으로 형성되어, 전극 조립체(10)와 전극단자(51) 사이에서 불필요한 저항 증가가 방지될 수 있다.Therefore, the path of the current from the plain tabs 112, that is, the first tab group G11 and the second tab group G12 to the inner plate 511 and the rivet part 512 is formed at the shortest, and thus, the electrode assembly 10 is formed. And unnecessary resistance increase between the electrode terminal 51 can be prevented.
또한 무지부 탭들(112), 즉 제1탭군(G11)과 제2탭군(G12)은 설정된 길이를 가진 상태에서, 제1, 제2개방부(211, 212)에 의하여 경유 길이가 길어지므로 긴장된 상태를 유지할 수 있다. In addition, since the tabs 112, that is, the first tap group G11 and the second tap group G12 have a set length, the lengths of the diesel passages are increased by the first and second openings 211 and 212, so that they are tense. State can be maintained.
따라서 전극 조립체(10)를 케이스(30) 내에 삽입하는 경우에도, 무지부 탭들(112, 122)은 접히지 않게 된다. 전극 조립체(10)가 케이스(30)에 삽입된 상태에서도 긴장된 상태를 유지하는 무지부 탭들(112, 122)은 음, 양극(11, 12)과 접촉되지 않는다. 즉 무지부 탭들(112, 122)에 의한 단락 및 셀 이벤트가 방지될 수 있다.Therefore, even when the electrode assembly 10 is inserted into the case 30, the tabs 112 and 122 are not folded. The plain tabs 112 and 122 which remain in tension even when the electrode assembly 10 is inserted into the case 30 are not in contact with the negative and positive electrodes 11 and 12. That is, short circuits and cell events caused by the uncoated tabs 112 and 122 can be prevented.
이하에서 본 발명의 제2실시예에 따른 이차 전지에 대하여 설명한다. 편의상, 제1, 제2실시예의 구성을 비교하여, 동일한 구성을 생략하고 서로 다른 구성에 대하여 설명한다.Hereinafter, a rechargeable battery according to a second exemplary embodiment of the present invention will be described. For the sake of convenience, the configurations of the first and second embodiments are compared, and the same configurations will be omitted and different configurations will be described.
도 8은 본 발명의 제2실시예에 따른 이차 전지의 단면도이다. 도 8을 참조하면, 본 발명의 제2실시예의 이차 전지(200)에서, 탑 인슐레이터(70)는 무지부 탭들(312)의 경유 경로를 확장시키는 확장부(71) 및 전극 조립체(10) 상에 배치되는 플레이트부(72)를 포함한다. 확장부(71)는 제1원형부(711)와 제2원형부(712)를 포함한다.8 is a cross-sectional view of a rechargeable battery according to a second exemplary embodiment of the present invention. Referring to FIG. 8, in the secondary battery 200 of the second exemplary embodiment of the present invention, the top insulator 70 is disposed on the extension 71 and the electrode assembly 10 that extend the passage path of the plain tabs 312. It comprises a plate portion 72 disposed in. The expansion portion 71 includes a first circular portion 711 and a second circular portion 712.
제1원형부(711)는 플레이트부(72)의 폭 방향(x축 방향)의 제1측(도 8의 좌측)에서 폭 방향(x축 방향)에 교차하는 방향(zx 단면)으로 설정되는 원형 단면으로 형성된다. 제2원형부(712)는 플레이트부(72)의 제1측의 반대측인 제2측(도 8의 우측)에서 교차하는 방향(zx 단면)으로 설정되는 원형 단면으로 형성된다.The first circular portion 711 is set in a direction (zx cross section) that crosses the width direction (x-axis direction) at the first side (left side of FIG. 8) in the width direction (x-axis direction) of the plate portion 72. It is formed into a circular cross section. The second circular portion 712 is formed in a circular cross section set in the direction (zx cross section) that intersects on the second side (right side in FIG. 8), which is the opposite side of the first side of the plate portion 72.
탑 인슐레이터(70)의 제1, 제2원형부(711, 712)는 전극단자(51)의 최하면, 즉 내부 플레이트(511)의 하면보다 더 높게 높이 차(ΔH2)를 가지고 돌출된다(z축 방향). 따라서 제1, 제2원형부(711, 712)를 경유하는 무지부 탭(312)은 z축 방향으로 긴장된다.The first and second circular portions 711 and 712 of the top insulator 70 protrude with the height difference ΔH2 higher than the lowermost surface of the electrode terminal 51, that is, the lower surface of the inner plate 511 (z Axial direction). Accordingly, the plain tabs 312 passing through the first and second circular portions 711 and 712 are tensioned in the z-axis direction.
탑 인슐레이터(70)의 제1, 제2원형부(711, 712)는 전극 조립체(10)에서 무지부 탭들(312)이 모이는 중심 위치(P1, P2)보다 폭 방향(x축 방향)으로 더 넓게 너비 차(ΔW2)를 가지고 확장된다. 따라서 제1, 제2원형부(711, 712)를 경유하는 무지부 탭(312)은 x축 방향으로 더 긴장된다.The first and second circular portions 711 and 712 of the top insulator 70 are further in the width direction (x-axis direction) than the central positions P1 and P2 where the tabs 312 are assembled in the electrode assembly 10. Wide with a width difference ΔW2. Accordingly, the plain tabs 312 via the first and second circular portions 711 and 712 are further tensioned in the x-axis direction.
제1, 제2원형부(711, 712)는 전극 조립체(10)를 향하여 볼록한 구조를 가진다. 따라서 탑 인슐레이터(70)의 제1, 제2원형부(711, 712)를 경유하는 무지부 탭(312)은 제1, 제2원형부(711, 712)의 볼록한 외면을 경유하여 긴장되면서 내부 플레이트(511)에 연결될 수 있다.The first and second circular portions 711 and 712 have a convex structure toward the electrode assembly 10. Accordingly, the plain tabs 312 passing through the first and second circular portions 711 and 712 of the top insulator 70 are tensioned through the convex outer surfaces of the first and second circular portions 711 and 712. It may be connected to the plate 511.
제1탭군(G31)은 폭 방향(x축 방향) 제1측(도 8의 좌측)에서 탑 인슐레이터(70)의 확장부(71), 즉 제1원형부(711)의 외면을 경유하여 제2측으로 휘어져 전극단자(51)의 내부 플레이트(511)에 연결된다. 이때, 제1탭군(G31)은 제1원형부(711)에 의하여 x축 방향(후방) 및 z축 방향(상방)으로 긴장된다.The first tab group G31 is formed in the width direction (x-axis direction) on the first side (left side in FIG. 8) via the expansion portion 71 of the top insulator 70, that is, the outer surface of the first circular portion 711. It is bent to two sides and connected to the inner plate 511 of the electrode terminal 51. At this time, the first tap group G31 is tensioned in the x-axis direction (rear) and the z-axis direction (upward) by the first circular portion 711.
제2탭군(G32)은 제1탭군(G31)의 반대측인 폭 방향(x축 방향) 제2측(도 8의 우측)에서 탑 인슐레이터(70)의 확장부(71), 즉 제2원형부(712)의 외면을 경유하여 제1측으로 휘어져 전극단자(51)의 내부 플레이트(511)에 연결된다. 이때, 제2탭군(G32)은 제2원형부(712)에 의하여 x축 방향(후방) 및 z축 방향(상방)으로 긴장된다.The second tap group G32 is an extension 71 of the top insulator 70, that is, a second circular part, on the second side (right side of FIG. 8) in the width direction (x-axis direction) opposite to the first tap group G31. It is bent to the first side via the outer surface of the 712 is connected to the inner plate 511 of the electrode terminal 51. At this time, the second tab group G32 is tensioned in the x-axis direction (rear) and the z-axis direction (upward) by the second circular portion 712.
무지부 탭들(312), 즉 제1탭군(G31)과 제2탭군(G32)은 설정된 길이를 가진 상태에서, 제1, 제2원형부(711, 712)에 의하여 경유 길이가 길어지므로 긴장된 상태를 유지할 수 있다.The plain tabs 312, that is, the first tap group G31 and the second tab group G32 have a set length, and thus the length of the diesel passage is increased by the first and second circular parts 711 and 712, so that the tension is increased. Can be maintained.
따라서 전극 조립체(10)를 케이스(30) 내에 삽입하는 경우에도, 무지부 탭들(312)은 접히지 않게 된다. 전극 조립체(10)가 케이스(30)에 삽입된 상태에서도 긴장된 상태를 유지하는 무지부 탭들(312)은 음, 양극(11, 12)과 접촉되지 않는다. 즉 무지부 탭들(312)에 의한 단락 및 셀 이벤트가 방지될 수 있다.Accordingly, even when the electrode assembly 10 is inserted into the case 30, the tabs 312 are not folded. The plain tabs 312, which remain in tension even when the electrode assembly 10 is inserted into the case 30, are not in contact with the negative and positive electrodes 11 and 12. That is, short circuits and cell events caused by the uncoated tabs 312 can be prevented.
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 --Explanation of Codes-
10: 전극 조립체 11: 제1전극(음극)10: electrode assembly 11: first electrode (cathode)
12: 제2전극(양극) 13: 세퍼레이터12: second electrode (anode) 13: separator
20: 탑 인슐레이터 21, 71: 확장부20: top insulator 21, 71: extension
22, 72: 플레이트부 27: 내부 벤트홀22, 72: plate portion 27: internal vent hole
28: 내부 전해액 주입구 30: 케이스28: internal electrolyte injection hole 30: case
31: 개구 40: 캡 플레이트31: opening 40: cap plate
41: 벤트홀 42: 전해액 주입구41: vent hole 42: electrolyte injection hole
51, 52: 전극단자 70: 탑 인슐레이터51, 52: electrode terminal 70: top insulator
100, 200: 이차 전지 101: 제1조립체100, 200: secondary battery 101: the first assembly
102: 제2조립체 111, 121: 코팅부102: second assembly 111, 121: coating
112, 122, 312: 무지부 탭 211: 제1개방부112, 122, 312: Plain tabs 211: First open portion
212: 제2개방부 411: 벤트 플레이트212: 2nd opening part 411: vent plate
412: 노치 421: 밀봉 마개412: notch 421: sealing stopper
511, 521: 내부 플레이트 513, 523: 외부 플레이트511, 521: inner plate 513, 523: outer plate
512, 522: 리벳부 514, 524: 결합홀512 and 522: rivet parts 514 and 524: coupling holes
611, 612: 내부 절연부재 621, 622: 개스킷611, 612: internal insulation members 621, 622: gasket
631, 632: 외부 절연부재 711: 제1원형부631, 632: external insulation member 711: first circular portion
712: 제2원형부 D: 거리712: second circular portion D: distance
G11, G21, G31: 제1탭군 G12, G22, G32: 제2탭군G11, G21, G31: 1st tap group G12, G22, G32: 2nd tap group
H1, H2: 단자홀 P1, P2: 중심 위치H1, H2: Terminal hole P1, P2: Center position
T: 권취 범위 WL: 용접 라인T: winding range WL: welding line
ΔH, ΔH2: 높이 차 ΔW, ΔW2: 너비 차ΔH, ΔH2: height difference ΔW, ΔW2: width difference

Claims (12)

  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 결합되는 캡 플레이트;A cap plate coupled to the opening of the case;
    상기 전극 조립체와 상기 캡 플레이트 사이에 배치되는 탑 인슐레이터; 및A top insulator disposed between the electrode assembly and the cap plate; And
    상기 캡 플레이트의 단자홀에 설치되고 상기 캡 플레이트의 폭 방향에서 상기 탑 인슐레이터의 외측을 경유하는 상기 무지부 탭들에 연결되는 전극단자An electrode terminal installed in the terminal hole of the cap plate and connected to the plain tabs passing through the outer side of the top insulator in the width direction of the cap plate;
    를 포함하며,Including;
    상기 탑 인슐레이터는The top insulator is
    상기 캡 플레이트의 폭 방향의 적어도 일측 단부에서 상기 무지부 탭들의 경유 경로를 증대시키는 방향으로 확장되는 확장부Expansion portion extending in the direction of increasing the passage path of the plain tabs at at least one end in the width direction of the cap plate
    를 포함하는 이차 전지.Secondary battery comprising a.
  2. 제1항에 있어서,The method of claim 1,
    상기 전극 조립체는The electrode assembly is
    상기 폭 방향으로 나란하게 배치되는 제1조립체와 제2조립체를 포함하며,It includes a first assembly and a second assembly arranged side by side in the width direction,
    상기 무지부 탭들은The plain tabs
    상기 제1조립체의 전극들에 연결되는 제1탭군과 상기 제2조립체의 전극들에 연결되는 제2탭군을 포함하는 이차 전지.A secondary battery comprising a first tab group connected to the electrodes of the first assembly and a second tab group connected to the electrodes of the second assembly.
  3. 제2항에 있어서,The method of claim 2,
    상기 탑 인슐레이터는The top insulator is
    상기 전극 조립체 상에 배치되는 플레이트부를 더 포함하며,Further comprising a plate portion disposed on the electrode assembly,
    상기 확장부는The extension portion
    상기 플레이트부의 상기 폭 방향의 제1측에서 상기 전극 조립체를 향하여 볼록하고 상기 전극단자를 향하여 오목하게 형성되는 제1개방부, 및A first open portion that is convex toward the electrode assembly and concave toward the electrode terminal at the first side in the width direction of the plate portion, and
    상기 플레이트부의 상기 제1측의 반대측인 제2측에서 상기 전극 조립체를 향하여 볼록하고 상기 전극단자를 향하여 오목하게 형성되는 제2개방부를 포함하는 이차 전지.And a second open portion that is convex toward the electrode assembly and concave toward the electrode terminal at a second side opposite to the first side of the plate portion.
  4. 제3항에 있어서,The method of claim 3,
    상기 제1탭군은The first tap group is
    상기 제1측에서 상기 제1개방부의 외면을 경유하여 상기 제2측으로 휘어져 상기 전극단자에 연결되고,The first side is bent to the second side via the outer surface of the first opening and connected to the electrode terminal,
    상기 제2탭군은The second tap group is
    상기 제2측에서 상기 제2개방부의 외면을 경유하여 상기 제1측으로 휘어져 상기 전극단자에 연결되는 이차 전지.The secondary battery of the second side is bent to the first side via the outer surface of the second opening portion and connected to the electrode terminal.
  5. 제4항에 있어서,The method of claim 4, wherein
    상기 전극단자는The electrode terminal
    상기 단자홀에 설치되는 리벳부,Rivet portion installed in the terminal hole,
    상기 캡 플레이트의 외측에 배치되어 상기 리벳부에 연결되는 외부 플레이트, 및An outer plate disposed outside the cap plate and connected to the rivet part;
    상기 캡 플레이트의 내측에 배치되어 상기 리벳부에 연결되는 내부 플레이트를 포함하며,An inner plate disposed inside the cap plate and connected to the rivet part;
    상기 제1탭군과 상기 제2탭군은The first tap group and the second tap group
    상기 내부 플레이트에 용접되는 이차 전지.A secondary battery welded to the inner plate.
  6. 제5항에 있어서,The method of claim 5,
    상기 제1탭군과 상기 제2탭군은The first tap group and the second tap group
    상기 폭 방향에서 상기 내부 플레이트의 하면에 설정되는 용접 라인에서 마주하여 용접되고,Welded facing each other in a welding line set on a lower surface of the inner plate in the width direction;
    상기 리벳부는The rivet part
    상기 용접 라인에 대응하는 상기 내부 플레이트의 상면에서 상기 제1탭군과 상기 제2탭군의 단부 사이에 연결되는 이차 전지.A secondary battery connected between an end portion of the first tab group and the second tab group on an upper surface of the inner plate corresponding to the welding line.
  7. 제1항에 있어서,The method of claim 1,
    상기 확장부는The extension portion
    상기 전극단자의 단부보다 상기 폭 방향으로 더 확장되는 이차 전지.The secondary battery further extends in the width direction than the end of the electrode terminal.
  8. 제1항에 있어서,The method of claim 1,
    상기 확장부는The extension portion
    상기 전극단자의 최하면 보다 더 높게 높이 차를 가지고 돌출되는 이차 전지.A secondary battery protruding with a height difference higher than the bottom of the electrode terminal.
  9. 제1항에 있어서,The method of claim 1,
    상기 확장부는The extension portion
    상기 전극 조립체에서 상기 무지부 탭들이 모이는 중심 위치보다 상기 폭 방향으로 더 넓게 너비 차를 가지고 확장되는 이차 전지.The secondary battery of the electrode assembly is extended with a width difference wider in the width direction than the central position where the tab tabs gather.
  10. 제9항에 있어서,The method of claim 9,
    상기 확장부는The extension portion
    상기 전극 조립체를 향하여 볼록한 구조를 가지는 이차 전지.A secondary battery having a convex structure toward the electrode assembly.
  11. 제2항에 있어서,The method of claim 2,
    상기 탑 인슐레이터는The top insulator is
    상기 전극 조립체 상에 배치되는 플레이트부를 더 포함하며,Further comprising a plate portion disposed on the electrode assembly,
    상기 확장부는The extension portion
    상기 플레이트부의 상기 폭 방향의 제1측에서 상기 폭 방향에 교차하는 방향으로 설정되는 원형 단면으로 형성되는 제1원형부, 및A first circular portion formed of a circular cross section set in a direction crossing the width direction on a first side of the width direction of the plate portion, and
    상기 플레이트부의 상기 제1측의 반대측인 제2측에서 상기 교차하는 방향으로 설정되는 원형 단면으로 형성되는 제2원형부를 포함하는 이차 전지.And a second circular portion formed in a circular cross section set in the crossing direction on a second side opposite to the first side of the plate portion.
  12. 제11항에 있어서,The method of claim 11,
    상기 제1탭군은The first tap group is
    상기 제1측에서 상기 제1원형부의 외면을 경유하여 상기 제2측으로 휘어져 상기 전극단자에 연결되고,The first side is bent to the second side via an outer surface of the first circular portion and connected to the electrode terminal;
    상기 제2탭군은The second tap group is
    상기 제2측에서 상기 제2원형부의 외면을 경유하여 상기 제1측으로 휘어져 상기 전극단자에 연결되는 이차 전지.The secondary battery is bent to the first side via the outer surface of the second circular portion on the second side and connected to the electrode terminal.
PCT/KR2017/006745 2016-07-25 2017-06-27 Rechargeable battery WO2018021698A1 (en)

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