WO2017188563A1 - Rechargeable battery having protection member - Google Patents

Rechargeable battery having protection member Download PDF

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Publication number
WO2017188563A1
WO2017188563A1 PCT/KR2017/001164 KR2017001164W WO2017188563A1 WO 2017188563 A1 WO2017188563 A1 WO 2017188563A1 KR 2017001164 W KR2017001164 W KR 2017001164W WO 2017188563 A1 WO2017188563 A1 WO 2017188563A1
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WO
WIPO (PCT)
Prior art keywords
electrode
terminal
protective member
current collecting
secondary battery
Prior art date
Application number
PCT/KR2017/001164
Other languages
French (fr)
Korean (ko)
Inventor
권민형
서용철
곽승호
Original Assignee
삼성에스디아이 주식회사
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Application filed by 삼성에스디아이 주식회사 filed Critical 삼성에스디아이 주식회사
Publication of WO2017188563A1 publication Critical patent/WO2017188563A1/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
    • H01M50/50—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
    • H01M50/10—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M2200/00—Safety devices for primary or secondary 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a secondary battery, and more particularly to a secondary battery having a protective member.
  • a rechargeable battery is a battery that can be charged and discharged unlike a primary battery that is not rechargeable.
  • Low-capacity secondary batteries are used in portable electronic devices such as mobile phones, notebook computers, and camcorders, and large-capacity batteries are widely used as power sources for driving motors in hybrid vehicles.
  • the high output secondary battery includes a plurality of secondary batteries in series so as to be used for driving a motor such as an electric vehicle requiring a large power. It consists of a large capacity rechargeable battery.
  • one large-capacity secondary battery is usually made of a plurality of secondary batteries connected in series, the secondary battery may be made of a cylindrical and square.
  • the secondary battery also has an electrode assembly that performs charging and discharging, the electrode assembly including a positive electrode and a negative electrode and a separator interposed between the positive electrode and the negative electrode.
  • the electrode assembly may have a structure in which a plurality of positive electrode plates and a negative electrode plate are stacked, or may have a structure in which a strip-shaped positive electrode and a negative electrode are wound.
  • the electrode assembly is electrically connected to the terminal through the current collecting member, and foreign substances generated during the bonding of the current collecting member with the other members may enter the electrode assembly, and these foreign substances may adversely affect the charging and discharging. .
  • One aspect of the invention provides a secondary battery that can reduce the intrusion of foreign matter.
  • a secondary battery includes a first electrode, an electrode assembly including a second electrode, a case accommodating the electrode assembly, a cap plate coupled to the case, and electrically connected to the first electrode.
  • a first terminal protruding outward from the cap plate, a first current collecting member electrically connecting the first electrode and the first terminal, and a first protective member covering a surface of the first current collecting member toward the electrode assembly;
  • the first protective member may be installed to cover the first joint portion to which the first electrode and the first current collecting member are bonded, and the first protective member may be formed of a gel layer.
  • the first protective member may be made to have a viscosity of 25 to 100cps to 10000cps, the first protective member may be made of a film having an adhesive layer.
  • the first current collecting member may be disposed to face the cap plate, and the first bonding part may be formed by welding the first electrode and the first current collecting member to each other.
  • the secondary battery may further include a second protective member covering a second joint part to which the first terminal and the first current collecting member are joined, and the second protective member may be formed of a gel layer.
  • the second protective member may be formed of a film having an adhesive layer.
  • the first terminal includes a plate-shaped first terminal plate and a first terminal pillar installed through the first terminal plate, and the second joint portion is a portion in which the first terminal pillar and the first contact member are welded. Can be done.
  • the secondary battery has a second terminal electrically connected to the second electrode and protruding outwardly of the cap plate, a second current collecting member electrically connecting the second electrode and the second terminal, the second electrode and the
  • the display device may further include a third protection member covering a third junction where the second current collecting member is bonded, and a fourth protection member covering a fourth junction where the second terminal and the second electrode are bonded.
  • the third protective member or the fourth protective member may be formed of a gel layer, and the third protective member or the fourth protective member may be formed of a film having an adhesive layer.
  • a protection member is installed at the portion where the electrode and the current collector member are joined, foreign substances generated at the time of bonding may be prevented from entering.
  • FIG. 1 is a perspective view illustrating 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 of FIG. 1.
  • FIG. 3 is an exploded perspective view illustrating a part of a rechargeable battery according to a first exemplary embodiment of the present invention.
  • FIG 4 is a plan view showing a state in which the electrode assembly is bonded to the cap assembly according to the first embodiment of the present invention.
  • FIG. 5 is a perspective view illustrating a state in which a first protective member and a second protective member are installed in the first current collecting member according to the first embodiment of the present invention.
  • FIG. 6 is a perspective view illustrating a state in which a third protective member and a fourth protective member are installed in the second current collecting member according to the first embodiment of the present invention.
  • FIG. 7 is a perspective view illustrating a state in which a first protective member and a second protective member are installed in a first current collecting member according to a second embodiment of the present invention.
  • FIG. 8 is a perspective view illustrating a state in which a third protective member and a fourth protective member are installed in the second current collecting member according to the second embodiment of the present invention.
  • FIG. 1 is a perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention
  • FIG. 2 is a cross-sectional view taken along the line -II of FIG. 1.
  • the secondary battery 101 includes a separator 13 between a first electrode (anode) 11 and a second electrode (cathode) 12. And an electrode assembly 10 wound up, a case 28 in which the electrode assembly 10 is embedded, and a cap assembly 30 coupled to an opening of the case 28.
  • Secondary battery 101 according to the present embodiment is described as an example of a rectangular as a lithium ion secondary battery.
  • the present invention is not limited thereto, and the present invention may be applied to various types of batteries such as lithium polymer batteries or cylindrical batteries.
  • the secondary battery 101 according to the present embodiment may be made of a battery for starting a vehicle, in particular as a high output rectangular battery.
  • the case 28 is formed of a substantially rectangular parallelepiped, and an opening is formed in one surface.
  • the case 28 may be made of metal such as aluminum or stainless steel.
  • the cap assembly 30 protrudes out of the cap plate 31 and the cap plate 31 covering the opening of the case 28, and the first terminal 21 and the cap plate electrically connected to the first electrode 11. It includes a second terminal 25 protruding out of the 31 and electrically connected to the second electrode 12.
  • the cap plate 31 is formed in the form of an elongated plate extending in one direction and is coupled to the opening of the case 28.
  • the cap plate 31 is provided with a sealing stopper 38 installed in the electrolyte injection hole 32 and a vent plate 39 formed with a notch 39a so as to be opened at a set pressure.
  • the first terminal 21 and the second terminal 25 are installed to protrude upward of the cap plate 31.
  • the first terminal 21 is electrically connected to the first electrode 11 through the first current collecting member 41, and the second terminal 25 is connected to the second electrode 25 via the second current collecting member 42. 12) and electrically connected.
  • the present invention is not limited thereto, and the first terminal 21 may be electrically connected to the negative electrode, and the second terminal 25 may be electrically connected to the positive electrode.
  • the first terminal 21 includes a first terminal plate 22 having a plate shape and a first terminal pillar 23 installed through the first terminal plate 22.
  • the first terminal plate 22 is disposed in parallel with the cap plate 31 on the cap plate 31 and is electrically connected to the first electrode 11 through the first terminal pillar 23.
  • the first terminal pillar 23 has a rod shape and is installed to penetrate through the first terminal plate 22 and the cap plate 31.
  • the first terminal pillar 23 has a rod-shaped pillar portion 231, a flange portion 232 protruding laterally from the lower portion of the pillar portion 231, and a lower portion protruding downward from the lower surface of the pillar portion 231. And a protrusion 235.
  • the upper end of the first terminal pillar 23 is fixed to the first terminal plate 22 by welding in a state of being fitted to the first terminal plate 22.
  • the lower end of the first terminal pillar 23 is joined to the first current collecting member 41 by welding.
  • the lower protrusion 235 is inserted into the coupling hole 418 formed in the first current collecting member 41, and the lower end of the lower protrusion 235 and the first current collecting member 41 are welded.
  • a sealing gasket 59 for sealing is inserted between the first terminal pillar 23 and the cap plate 31 in a hole through which the first terminal pillar 23 penetrates, and below the cap plate 31.
  • the lower insulating member 43 supporting the current collecting member 41 is installed.
  • the lower portion of the first terminal plate 22 is provided with a connecting member 58 for electrically connecting the first terminal 21 and the cap plate 31. Accordingly, the cap plate 31 and the case 28 are charged with the positive electrode.
  • the second terminal 25 includes a second terminal plate 26 having a plate shape and a second terminal pillar 27 installed through the second terminal plate 26.
  • the second terminal plate 26 is disposed in parallel with the cap plate 31 on the cap plate 31 and is electrically connected to the second electrode 12 via the second terminal pillar 27.
  • the second terminal pillar 27 has a rod shape and is installed to penetrate through the second terminal plate 26 and the cap plate 31.
  • the second terminal pillar 27 has a rod-shaped pillar portion 271 and a flange portion 272 protruding laterally from the lower portion of the pillar portion 271, and a lower portion protruding downward from the lower surface of the pillar portion 271. And projection 275.
  • the upper end of the second terminal pillar 27 is fixed to the second terminal plate 26 by welding in a state of being fitted to the second terminal plate 26.
  • the lower end of the second terminal pillar 27 is joined to the second current collecting member 42 by welding.
  • the lower protrusion 275 is inserted into the coupling hole 428 formed in the second current collecting member 42, and the lower end of the lower protrusion 275 and the second current collecting member 42 are welded.
  • a sealing gasket 55 for sealing is inserted between the second terminal pillar 27 and the cap plate 31 in a hole through which the second terminal pillar 27 penetrates, and a second portion below the cap plate 31 is provided.
  • a lower insulating member 45 supporting the current collector member 42 and insulated from the cap plate 31 is installed.
  • a shorting protrusion 261 protruding toward the shorting hole 37 is formed on the lower surface of the second terminal plate 26.
  • the second terminal 25 is formed to extend in one direction to cover the short-circuit hole 37.
  • An upper insulating member 54 is provided between the second terminal 25 and the cap plate 31 to electrically insulate the second terminal 25 and the cap plate 31.
  • the cap assembly 30 includes a shorting member 56 that shorts the first electrode 11 and the second electrode 12.
  • the shorting member 56 is electrically connected to the cap plate 31. When the internal pressure of the battery 101 rises, the battery 101 deforms and is connected to the second terminal 25.
  • a shorting hole 37 is formed in the cap plate 31, and the shorting member 56 is disposed between the upper insulating member 54 and the cap plate 31 in the shorting hole 37.
  • the second terminal plate 26 is disposed on the short circuit hole 37 to cover the short circuit hole 37.
  • the short circuit member 56 includes a curved portion that is curved in a convex shape downward and an outer edge portion of the curved portion and fixed to the cap plate 31.
  • the internal pressure of the secondary battery increases.
  • the curved portion is deformed so as to be convex upward.
  • the shorting protrusion 261 and the shorting member 56 abut and cause a short circuit.
  • FIG. 3 is an exploded perspective view illustrating a part of a rechargeable battery according to an exemplary embodiment of the present invention.
  • the electrode assembly 10 is disposed between the band-shaped first electrode 11, the second electrode 12, and the first electrode 11 and the second electrode 12. It includes a separator 13, it is made of a wound structure. One or more electrode assemblies 10 may be inserted in the case 28.
  • the first electrode 11 includes a first coating part on which a positive electrode active material layer is formed and a first electrode tab 11a on which a positive electrode active material layer is not formed.
  • the first electrode tab 11a has a structure in which a plurality of first electrode tabs 11a are stacked.
  • the second electrode 12 includes a second coating part on which the positive electrode active material layer is formed and a second electrode tab 12a on which the positive electrode active material layer is not formed.
  • the second electrode tab 12a has a plurality of stacked structures. Is made of.
  • the first electrode tab 11a and the second electrode tab 12a protrude toward the cap plate 31 from the upper end of the electrode assembly 10 and are spaced apart from each other in the width direction of the electrode assembly 10.
  • the first collector member 41 is bent from the support plate 411 bonded to the first terminal pillar 23, the electrode attachment portion 413 and the support plate 411 bonded to the first electrode tab 11a, and formed to be inclined. And a connection part 415 connecting the support plate 411 and the electrode attachment part 413.
  • the support plate 411 is located below the electrode attachment portion 413.
  • the support plate 411 has a rectangular plate shape and is fixed by welding to the lower portion of the first terminal column 23.
  • a coupling hole 418 is formed in the support plate 411, and the first terminal pillar 23 and the support plate are inserted in the state in which the lower protrusion 235 formed below the first terminal pillar 23 is fitted in the coupling hole 418. 411 is welded.
  • a fuse hole 416 is formed in the support plate 411, and a portion in which the fuse hole 416 is formed may have a smaller cross-sectional area than the periphery and may melt when an overcurrent flows.
  • the support plate 411 may be provided with a support member 48 surrounding the fuse hole 416.
  • the electrode attachment portion 413 may be formed of a square plate, and a ventilation hole 419 may be formed in the electrode attachment portion 413.
  • the first attachment parts 81 and 82 to which the first electrode tab 11a is welded, are formed in the electrode attachment part 413, and the first plate 21 is formed in the support plate 411.
  • a second joining portion 83 having a lower end joined by welding is formed.
  • the first junctions 81 and 82 may be formed by ultrasonic welding of the first electrode tab 11a and the electrode attachment part 413 and may have a substantially rectangular cross section.
  • a first protective member 61 covering the first junctions 81 and 82 may be installed at the first junctions 81 and 82. The first protective member 61 is installed to cover the bottom surface of the first current collecting member 41 toward the electrode assembly 10.
  • the first protective member 61 covers the first joints 81 and 82 as a whole and extends to the first current collecting member 41 to cover a part of the first current collecting member 41.
  • the first protective member 61 is made of a gel layer.
  • the first protective member 61 is applied to the first bonding parts 81 and 82 and may be made of a transparent material.
  • the first protective member 61 maintains a gel state by dispersing dispersed phase particles in a dispersion medium to form secondary bonds of the dispersed phase particles.
  • the material of the colloid and the dispersion medium, which are dispersed phase particles, is not limited and various materials may be applied.
  • the second junction part 83 may be formed by laser welding of the support plate 411 and the first terminal 21, and may have a substantially annular cross section.
  • a second protective member 62 may be installed on the second junction 83 to cover the second junction 83.
  • the second protective member 62 covers the second joint portion 83 as a whole and extends to the first current collecting member 41 to cover a portion of the first current collecting member 41.
  • the second protective member 62 is made of a gel layer.
  • the second protective member 62 is applied to the second bonding portion 83 and may be made of a transparent material.
  • the second protective member 62 maintains the gel state by dispersing the dispersed phase particles in the dispersion medium to form secondary bonds of the dispersed phase particles.
  • the second current collecting member 42 is attached to the support plate 421 bonded to the second terminal pillar 27 and the electrode plate 10 bent toward the electrode assembly 10 from the support plate 421 and directly bonded to the second electrode tab 12a.
  • Part 423 is included.
  • the electrode attachment portion 423 is bent to be parallel to the electrode assembly 10 at the widthwise end of the support plate 421.
  • the support plate 421 has a rectangular plate shape and is fixed by welding to the lower portion of the second terminal column 27.
  • a coupling hole 428 is formed in the supporting plate 421, and the second terminal pillar 27 and the supporting plate are inserted in the state in which the lower protrusion 275 formed below the second terminal pillar 27 is fitted in the coupling hole 428. 421 is welded.
  • the third attachment parts 85 and 86 to which the second electrode tab 12a is welded, are formed in the electrode attachment part 423, and the second terminal 25 is formed in the support plate 421.
  • the fourth joint portion 87 joined by welding is formed.
  • the third junction portions 85 and 86 may be formed by ultrasonic welding of the second electrode tab 12a and the electrode attachment portion 423, and may have a substantially rectangular cross section.
  • Third protection members 63 may be installed on the third junctions 85 and 86 to cover the third junctions 85 and 86.
  • the third protective member 63 covers the third joint portions 85 and 86 as a whole and extends to the second current collecting member 42 to cover a portion of the second current collecting member 42.
  • the third protective member 63 is made of a gel layer.
  • the third protective member 63 may be applied to the third junctions 85 and 86 and made of a transparent material.
  • the third protective member 63 maintains a gel state by dispersing dispersed phase particles in a dispersion medium to form secondary bonds of the dispersed phase particles.
  • the fourth junction part 87 may be formed by laser welding of the support plate 421 and the second terminal 25, and may have a substantially annular cross section.
  • a fourth protective member 64 covering the fourth junction 87 may be installed in the fourth junction 87.
  • the fourth protective member 64 is installed to cover the fourth joint part 87 as a whole and extend to the second current collecting member 42 to cover a part of the second current collecting member 42.
  • the fourth protective member 64 is made of a gel layer.
  • the fourth protective member 64 is applied to the fourth joint portion 87 and may be made of a transparent material.
  • the fourth protective member 64 maintains a gel state by dispersing dispersed phase particles in a dispersion medium to form secondary bonds of the dispersed phase particles.
  • the first protective member 61, the second protective member 62, the third protective member 63 and the fourth protective member 64 may be made of a resin, the thickness may be made of 0.1mm to 0.9mm and preferably It may be made up to 0.5mm or less.
  • the first protective member 61, the second protective member 62, the third protective member 63 and the fourth protective member 64 may be made to have a viscosity of 25 to 100cps to 10,000cps.
  • Metal particles may be attached to the joint by welding. When the metal particles are mixed with the electrolyte or penetrated into the electrode assembly 10, the metal particles may adversely affect charging and discharging, thereby reducing the life of the battery or causing an abnormal reaction.
  • applying the protective member in the gel state as in the present embodiment can prevent foreign matter from invading.
  • the protective members are made of a gel state, it is possible to prevent the protective member from falling off due to vibration or shock applied from the outside.
  • FIG. 7 is a perspective view illustrating a state in which a first protective member and a second protective member are installed in a first current collecting member according to a second embodiment of the present invention
  • FIG. 8 is a second current collecting unit according to a second embodiment of the present invention. It is a perspective view which shows the state in which the 3rd protective member and the 4th protective member were installed in the member.
  • the rechargeable battery according to the second exemplary embodiment has the same structure as the rechargeable battery according to the first exemplary embodiment except for the protection member, redundant description of the same structure will be omitted.
  • first electrode portions 81 and 82 to which the first electrode tab 11a is welded, are formed in the electrode attachment portion 413, and the first terminal 21 is formed in the support plate 411.
  • the second joint portion 83 joined by welding is formed.
  • the first junctions 81 and 82 may be formed by ultrasonic welding of the first electrode tab 11a and the electrode attachment part 413 and may have a substantially rectangular cross section.
  • First protective members 91 may be installed at the first junctions 81 and 82 to cover the first junctions 81 and 82.
  • the first protective member 91 covers the first joints 81 and 82 as a whole and extends to the first current collecting member 41 to cover a part of the first current collecting member 41.
  • the first protective member 91 may be formed of a film having an adhesive layer.
  • the first protective member 91 is attached to the first bonding portion and may be made of synthetic resin.
  • the second junction part 83 may be formed by laser welding of the support plate 411 and the first terminal 21, and may have a substantially annular cross section.
  • a second protective member 92 covering the second junction 83 may be installed in the second junction 83.
  • the second protective member 92 covers the second joint portion 83 as a whole and extends to the first current collecting member 41 to cover a portion of the first current collecting member 41.
  • the second protective member 92 may be formed of a film having an adhesive layer.
  • the second protective member 92 is attached to the second bonding portion 83 and may be made of synthetic resin.
  • third joining portions 85 and 86 formed by welding the second electrode tab 12a to the electrode attachment portion 423 are formed on the electrode attachment portion 423, and the second terminal 25 is formed on the support plate 421.
  • the fourth joint part 87 joined by welding is formed.
  • the third junction portions 85 and 86 may be formed by ultrasonic welding of the second electrode tab 12a and the electrode attachment portion 423, and may have a substantially rectangular cross section.
  • a third protective member 93 covering the third junctions 85 and 86 may be installed in the third junctions 85 and 86.
  • the third protective member 93 covers the third joints 85 and 86 as a whole and extends to the second current collecting member 42 to cover a part of the second current collecting member 42.
  • the third protective member 93 may be formed of a film having an adhesive layer.
  • the third protection member 93 may be attached to the third joint portions 85 and 86 and made of synthetic resin.
  • the fourth junction part 87 may be formed by laser welding of the support plate 421 and the second terminal 25, and may have a substantially annular cross section.
  • a fourth protective member 94 covering the fourth junction 87 may be installed in the fourth junction 87.
  • the fourth protective member 94 covers the fourth joint portion 87 as a whole and extends to the second current collecting member 42 to cover a portion of the second current collecting member 42.
  • the fourth protective member 94 may be formed of a film having an adhesive layer.
  • the fourth protective member 94 is attached to the fourth joint portion 87 and may be made of synthetic resin.
  • first terminal plate 23 first terminal pillar
  • cap plate 41 first collecting member
  • connection portion 416 fuse hole
  • first junction 83 second junction

Abstract

The present invention provides a rechargeable battery capable of reducing infiltration of foreign substances. The rechargeable battery according to one aspect of the present invention comprises: an electrode assembly comprising a first electrode and a second electrode; a case accommodating the electrode assembly; a cap plate coupled to the case; a first terminal electrically connected to the first electrode and protruding to the outside of the cap plate; a first current collection member electrically connecting the first electrode and first terminal; and a first protection member covering the surface on the first current collection member directed toward the electrode assembly.

Description

보호부재를 갖는 이차 전지Secondary Battery with Protective Member
본 발명은 이차 전지에 관한 것으로서, 보다 상세하게는 보호부재를 갖는 이차 전지에 관한 것이다.The present invention relates to a secondary battery, and more particularly to a secondary battery having a protective member.
이차 전지(rechargeable battery)는 충전이 불가능한 일차전지와는 달리 충전 및 방전이 가능한 전지이다. 저용량의 이차 전지는 휴대폰이나 노트북 컴퓨터 및 캠코더와 같이 휴대가 가능한 소형 전자기기에 사용되고, 대용량 전지는 하이브리드 자동차 등의 모터 구동용 전원으로 널리 사용되고 있다.A rechargeable battery is a battery that can be charged and discharged unlike a primary battery that is not rechargeable. Low-capacity secondary batteries are used in portable electronic devices such as mobile phones, notebook computers, and camcorders, and large-capacity batteries are widely used as power sources for driving motors in hybrid vehicles.
최근 들어 고에너지 밀도의 비수전해액을 이용한 고출력 이차 전지가 개발되고 있으며, 상기한 고출력 이차 전지는 대전력을 필요로 하는 기기 예컨대, 전기 자동차 등의 모터 구동에 사용될 수 있도록 복수 개의 이차 전지를 직렬로 연결하여 대용량의 이차 전지로 구성된다.Recently, a high output secondary battery using a high energy density nonaqueous electrolyte has been developed, and the high output secondary battery includes a plurality of secondary batteries in series so as to be used for driving a motor such as an electric vehicle requiring a large power. It consists of a large capacity rechargeable battery.
또한, 하나의 대용량 이차 전지는 통상 직렬로 연결되는 복수개의 이차 전지로 이루어지며, 이차 전지는 원통형과 각형 등으로 이루어질 수 있다. 또한 이차 전지는 충전과 방전을 수행하는 전극 어셈블리를 갖는데, 전극 어셈블리는 양극과 음극 및 양극과 음극 사이에 개재된 세퍼레이터를 포함한다. 전극 어셈블리는 복수의 양극판과 음극판이 적층된 구조로 이루어지거나, 띠 형상의 양극과 음극이 권취된 구조로 이루어질 수 있다.In addition, one large-capacity secondary battery is usually made of a plurality of secondary batteries connected in series, the secondary battery may be made of a cylindrical and square. The secondary battery also has an electrode assembly that performs charging and discharging, the electrode assembly including a positive electrode and a negative electrode and a separator interposed between the positive electrode and the negative electrode. The electrode assembly may have a structure in which a plurality of positive electrode plates and a negative electrode plate are stacked, or may have a structure in which a strip-shaped positive electrode and a negative electrode are wound.
전극 어셈블리는 집전부재를 매개로 단자와 전기적으로 연결되는데, 집전부재를 다른 부재와 접합하는 과정에서 발생된 이물질이 전극 어셈블리로 침입할 수 있으며, 이러한 이물질은 충전과 방전에 나쁜 영향을 미칠 수 있다. The electrode assembly is electrically connected to the terminal through the current collecting member, and foreign substances generated during the bonding of the current collecting member with the other members may enter the electrode assembly, and these foreign substances may adversely affect the charging and discharging. .
본 발명의 일 측면은 이물질의 침입을 감소시킬 수 있는 이차 전지를 제공한다.One aspect of the invention provides a secondary battery that can reduce the intrusion of foreign matter.
본 발명의 일 실시예에 따른 이차 전지는 제1전극, 제2전극을 포함하는 전극 어셈블리, 상기 전극 어셈블리를 수용하는 케이스, 상기 케이스에 결합된 캡 플레이트, 상기 제1전극과 전기적으로 연결되며 상기 캡 플레이트의 외측으로 돌출된 제1단자, 상기 제1전극과 상기 제1단자를 전기적으로 연결하는 제1집전부재, 및 상기 제1집전부재에서 상기 전극 어셈블리를 향하는 면을 덮는 제1보호부재를 포함한다.According to an embodiment of the present invention, a secondary battery includes a first electrode, an electrode assembly including a second electrode, a case accommodating the electrode assembly, a cap plate coupled to the case, and electrically connected to the first electrode. A first terminal protruding outward from the cap plate, a first current collecting member electrically connecting the first electrode and the first terminal, and a first protective member covering a surface of the first current collecting member toward the electrode assembly; Include.
상기 제1보호부재는 상기 제1전극과 상기 제1집전부재가 접합된 제1접합부를 덮도록 설치될 수 있으며, 상기 제1보호부재는 겔 레이어로 이루어질 수 있다.The first protective member may be installed to cover the first joint portion to which the first electrode and the first current collecting member are bonded, and the first protective member may be formed of a gel layer.
상기 제1보호부재는 25에서 100cps 내지 10000cps의 점도를 갖도록 이루어질 수 있으며, 상기 제1보호부재는 접착층을 갖는 필름으로 이루어질 수 있다.The first protective member may be made to have a viscosity of 25 to 100cps to 10000cps, the first protective member may be made of a film having an adhesive layer.
상기 제1집전부재는 상기 캡 플레이트와 마주하도록 배치되며, 상기 제1접합부는 상기 제1전극과 상기 제1집전부재가 용접된 부분으로 이루어질 수 있다.The first current collecting member may be disposed to face the cap plate, and the first bonding part may be formed by welding the first electrode and the first current collecting member to each other.
상기 이차 전지는 상기 제1단자와 상기 제1집전부재가 접합된 제2접합부를 덮는 제2보호부재를 더 포함할 수 있으며, 상기 제2보호부재는 겔 레이어로 이루어질 수 있다. 또한, 상기 제2보호부재는 접착층을 갖는 필름으로 이루어질 수 있다.The secondary battery may further include a second protective member covering a second joint part to which the first terminal and the first current collecting member are joined, and the second protective member may be formed of a gel layer. In addition, the second protective member may be formed of a film having an adhesive layer.
상기 제1단자는 판상의 제1단자 플레이트와 상기 제1단자 플레이트를 관통하여 설치된 제1단자 기둥을 포함하고, 상기 제2접합부는 상기 제1단자 기둥과 상기 제1집접부재가 용접된 부분으로 이루어질 수 있다.The first terminal includes a plate-shaped first terminal plate and a first terminal pillar installed through the first terminal plate, and the second joint portion is a portion in which the first terminal pillar and the first contact member are welded. Can be done.
상기 이차 전지는 상기 제2전극과 전기적으로 연결되며 상기 캡 플레이트의 외측으로 돌출된 제2단자, 상기 제2전극과 상기 제2단자를 전기적으로 연결하는 제2집전부재, 상기 제2전극과 상기 제2집전부재가 접합된 제3접합부를 덮는 제3보호부재, 상기 제2단자와 상기 제2전극이 접합된 제4접합부를 덮는 제4보호부재를 더 포함할 수 있다.The secondary battery has a second terminal electrically connected to the second electrode and protruding outwardly of the cap plate, a second current collecting member electrically connecting the second electrode and the second terminal, the second electrode and the The display device may further include a third protection member covering a third junction where the second current collecting member is bonded, and a fourth protection member covering a fourth junction where the second terminal and the second electrode are bonded.
상기 제3보호부재 또는 상기 제4보호부재는 겔 레이어로 이루어질 수 있으며, 상기 제3보호부재 또는 상기 제4보호부재는 접착층을 갖는 필름으로 이루어질 수 있다.The third protective member or the fourth protective member may be formed of a gel layer, and the third protective member or the fourth protective member may be formed of a film having an adhesive layer.
본 발명의 일 실시예에 따르면, 전극과 집전부재가 접합된 부분에 보호부재가 설치되므로 접합 시에 발생하는 이물질이 유입되는 것을 방지할 수 있다.According to an embodiment of the present invention, since a protection member is installed at the portion where the electrode and the current collector member are joined, foreign substances generated at the time of bonding may be prevented from entering.
도 1은 본 발명의 제1실시예에 따른 이차 전지를 도시한 사시도이다.1 is a perspective view illustrating a rechargeable battery according to a first exemplary embodiment of the present invention.
도 2는 도 1에서 -Ⅱ선을 따라 잘라 본 단면도이다.FIG. 2 is a cross-sectional view taken along the line -II of FIG. 1.
도 3은 본 발명의 제1실시예에 따른 이차 전지의 일부를 도시한 분해 사시도이다.3 is an exploded perspective view illustrating a part of a rechargeable battery according to a first exemplary embodiment of the present invention.
도 4는 본 발명의 제1실시예에 따른 캡 어셈블리에 전극 어셈블리가 접합된 상태를 도시한 평면도이다.4 is a plan view showing a state in which the electrode assembly is bonded to the cap assembly according to the first embodiment of the present invention.
도 5는 본 발명의 제1실시예에 따른 제1집전부재에 제1보호부재 및 제2보호부재가 설치된 상태를 도시한 사시도이다.5 is a perspective view illustrating a state in which a first protective member and a second protective member are installed in the first current collecting member according to the first embodiment of the present invention.
도 6은 본 발명의 제1실시예에 따른 제2집전부재에 제3보호부재 및 제4보호부재가 설치된 상태를 도시한 사시도이다.6 is a perspective view illustrating a state in which a third protective member and a fourth protective member are installed in the second current collecting member according to the first embodiment of the present invention.
도 7은 본 발명의 제2실시예에 따른 제1집전부재에 제1보호부재 및 제2보호부재가 설치된 상태를 도시한 사시도이다.7 is a perspective view illustrating a state in which a first protective member and a second protective member are installed in a first current collecting member according to a second embodiment of the present invention.
도 8은 본 발명의 제2실시예에 따른 제2집전부재에 제3보호부재 및 제4보호부재가 설치된 상태를 도시한 사시도이다.8 is a perspective view illustrating a state in which a third protective member and a fourth protective member are installed in the second current collecting member according to the second 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" 있다고 할 때 이는 다른 부분의 "바로 위에" 있는 경우뿐 아니라 그 중간에 다른 부분이 있는 경우도 포함한다. 그리고 "~위에"라 함은 대상 부분의 위 또는 아래에 위치하는 것을 의미하며, 반드시 중력 방향을 기준으로 상측에 위치하는 것을 의미하지 않는다.When parts of layers, films, regions, plates, etc. are "over" other parts throughout the specification, this includes not only being directly "on" other parts but also having other parts in between. And "on above" 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 일 실시예에 따른 이차 전지를 도시한 사시도이고, 도 2는 도 1에서 -Ⅱ선을 따라 잘라 본 단면도이다.1 is a perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line -II of FIG. 1.
도 1 및 도 2를 참조하여 설명하면, 본 일 실시예에 따른 이차 전지(101)는 제1전극(양극)(11)과 제2전극(음극)(12) 사이에 세퍼레이터(13)를 개재하여 귄취된 전극 어셈블리(10)와, 전극 어셈블리(10)가 내장되는 케이스(28)와, 케이스(28)의 개구에 결합된 캡 어셈블리(30)를 포함한다. Referring to FIGS. 1 and 2, the secondary battery 101 according to the present exemplary embodiment includes a separator 13 between a first electrode (anode) 11 and a second electrode (cathode) 12. And an electrode assembly 10 wound up, a case 28 in which the electrode assembly 10 is embedded, and a cap assembly 30 coupled to an opening of the case 28.
본 일 실시예에 따른 이차 전지(101)는 리튬 이온 이차 전지로서 각형인 것을 예로서 설명한다. 다만 본 발명이 이에 제한되는 것은 아니며, 본 발명은 리튬 폴리머 전지 또는 원통형 전지 등 다양한 형태의 전지에 적용될 수 있다. 또한, 본 실시예에 따른 이차 전지(101)는 고출력의 각형 전지로서 특히 차량의 시동용 전지로 이루어질 수 있다. Secondary battery 101 according to the present embodiment is described as an example of a rectangular as a lithium ion secondary battery. However, the present invention is not limited thereto, and the present invention may be applied to various types of batteries such as lithium polymer batteries or cylindrical batteries. In addition, the secondary battery 101 according to the present embodiment may be made of a battery for starting a vehicle, in particular as a high output rectangular battery.
케이스(28)는 대략 직육면체로 이루어지며, 일면에는 개방된 개구가 형성된다. 케이스(28)는 알루미늄, 스테인리스 스틸 등의 금속으로 이루어질 수 있다.The case 28 is formed of a substantially rectangular parallelepiped, and an opening is formed in one surface. The case 28 may be made of metal such as aluminum or stainless steel.
캡 어셈블리(30)는 케이스(28)의 개구를 덮는 캡 플레이트(31)와 캡 플레이트(31)의 외측으로 돌출되며, 제1전극(11)과 전기적으로 연결된 제1단자(21)와 캡 플레이트(31)의 외측으로 돌출되며 제2전극(12)과 전기적으로 연결된 제2단자(25)를 포함한다.The cap assembly 30 protrudes out of the cap plate 31 and the cap plate 31 covering the opening of the case 28, and the first terminal 21 and the cap plate electrically connected to the first electrode 11. It includes a second terminal 25 protruding out of the 31 and electrically connected to the second electrode 12.
캡 플레이트(31)는 일방향으로 이어진 길쭉한 판 형태로 이루어지며, 케이스(28)의 개구에 결합된다. 캡 플레이트(31)에는 전해액 주입구(32)에 설치된 밀봉 마개(38)와 벤트 홀(34)에 설치되며 설정된 압력에서 개방될 수 있도록 노치(39a)가 형성된 벤트 플레이트(39)가 설치된다. 제1단자(21) 및 제2단자(25)는 캡 플레이트(31)의 상부로 돌출되도록 설치된다.The cap plate 31 is formed in the form of an elongated plate extending in one direction and is coupled to the opening of the case 28. The cap plate 31 is provided with a sealing stopper 38 installed in the electrolyte injection hole 32 and a vent plate 39 formed with a notch 39a so as to be opened at a set pressure. The first terminal 21 and the second terminal 25 are installed to protrude upward of the cap plate 31.
제1단자(21)는 제1집전부재(41)를 매개로 제1전극(11)과 전기적으로 연결되며, 제2단자(25)는 제2집전부재(42)를 매개로 제2전극(12)과 전기적으로 연결된다. 다만 본 발명이 이에 제한되는 것은 아니며, 제1단자(21)가 음극과 전기적으로 연결되고, 제2단자(25)가 양극과 전기적으로 연결될 수도 있다.The first terminal 21 is electrically connected to the first electrode 11 through the first current collecting member 41, and the second terminal 25 is connected to the second electrode 25 via the second current collecting member 42. 12) and electrically connected. However, the present invention is not limited thereto, and the first terminal 21 may be electrically connected to the negative electrode, and the second terminal 25 may be electrically connected to the positive electrode.
제1단자(21)는 판 형상으로 이루어진 제1단자 플레이트(22)와 제1단자 플레이트(22)를 관통하여 설치된 제1단자 기둥(23)을 포함한다. 제1단자 플레이트(22)는 캡 플레이트(31) 상에서 캡 플레이트(31)와 평행하게 배치되며 제1단자 기둥(23)를 매개로 제1전극(11)과 전기적으로 연결된다. The first terminal 21 includes a first terminal plate 22 having a plate shape and a first terminal pillar 23 installed through the first terminal plate 22. The first terminal plate 22 is disposed in parallel with the cap plate 31 on the cap plate 31 and is electrically connected to the first electrode 11 through the first terminal pillar 23.
제1단자 기둥(23)은 막대 형상으로 이루어져 제1단자 플레이트(22)와 캡 플레이트(31)를 관통하여 설치된다. 제1단자 기둥(23)은 막대 형상의 기둥부(231)와 기둥부(231)의 하부에서 측방향으로 돌출된 플랜지부(232), 및 기둥부(231)의 하면에서 아래로 돌출된 하부 돌기(235)를 포함한다.The first terminal pillar 23 has a rod shape and is installed to penetrate through the first terminal plate 22 and the cap plate 31. The first terminal pillar 23 has a rod-shaped pillar portion 231, a flange portion 232 protruding laterally from the lower portion of the pillar portion 231, and a lower portion protruding downward from the lower surface of the pillar portion 231. And a protrusion 235.
제1단자 기둥(23)의 상단은 제1단자 플레이트(22)에 끼움된 상태에서 용접으로 제1단자 플레이트(22)에 고정된다. 또한 제1단자 기둥(23)의 하단은 제1집전부재(41)에 용접으로 접합된다. 하부 돌기(235)는 제1집전부재(41)에 형성된 결합 홀(418)에 삽입되며, 하부 돌기(235)의 하단과 제1집전부재(41)가 용접된다.The upper end of the first terminal pillar 23 is fixed to the first terminal plate 22 by welding in a state of being fitted to the first terminal plate 22. In addition, the lower end of the first terminal pillar 23 is joined to the first current collecting member 41 by welding. The lower protrusion 235 is inserted into the coupling hole 418 formed in the first current collecting member 41, and the lower end of the lower protrusion 235 and the first current collecting member 41 are welded.
제1단자 기둥(23)과 캡 플레이트(31) 사이에는 밀봉을 위한 실링 가스켓(59)이 제1단자 기둥(23)이 관통되는 홀에 삽입 설치되고, 캡 플레이트(31)의 아래에는 제1집전부재(41)를 지지하는 하부 절연부재(43)가 설치된다.A sealing gasket 59 for sealing is inserted between the first terminal pillar 23 and the cap plate 31 in a hole through which the first terminal pillar 23 penetrates, and below the cap plate 31. The lower insulating member 43 supporting the current collecting member 41 is installed.
제1단자 플레이트(22)의 하부에는 제1단자(21)와 캡 플레이트(31)를 전기적으로 연결하는 연결부재(58)가 설치된다. 이에 따라 캡 플레이트(31)와 케이스(28)는 양극으로 대전된다. The lower portion of the first terminal plate 22 is provided with a connecting member 58 for electrically connecting the first terminal 21 and the cap plate 31. Accordingly, the cap plate 31 and the case 28 are charged with the positive electrode.
제2단자(25)는 판 형상으로 이루어진 제2단자 플레이트(26)와 제2단자 플레이트(26)를 관통하여 설치된 제2단자 기둥(27)을 포함한다. 제2단자 플레이트(26)는 캡 플레이트(31) 상에서 캡 플레이트(31)와 평행하게 배치되며 제2단자 기둥(27)을 매개로 제2전극(12)과 전기적으로 연결된다. The second terminal 25 includes a second terminal plate 26 having a plate shape and a second terminal pillar 27 installed through the second terminal plate 26. The second terminal plate 26 is disposed in parallel with the cap plate 31 on the cap plate 31 and is electrically connected to the second electrode 12 via the second terminal pillar 27.
제2단자 기둥(27)은 막대 형상으로 이루어져 제2단자 플레이트(26)와 캡 플레이트(31)를 관통하여 설치된다. 제2단자 기둥(27)은 막대 형상의 기둥부(271)와 기둥부(271)의 하부에서 측방향으로 돌출된 플랜지부(272), 및 기둥부(271)의 하면에서 아래로 돌출된 하부 돌기(275)를 포함한다.The second terminal pillar 27 has a rod shape and is installed to penetrate through the second terminal plate 26 and the cap plate 31. The second terminal pillar 27 has a rod-shaped pillar portion 271 and a flange portion 272 protruding laterally from the lower portion of the pillar portion 271, and a lower portion protruding downward from the lower surface of the pillar portion 271. And projection 275.
제2단자 기둥(27)의 상단은 제2단자 플레이트(26)에 끼움된 상태에서 용접으로 제2단자 플레이트(26)에 고정된다. 또한 제2단자 기둥(27)의 하단은 제2집전부재(42)에 용접으로 접합된다. 하부 돌기(275)는 제2집전부재(42)에 형성된 결합 홀(428)에 삽입되며, 하부 돌기(275)의 하단과 제2집전부재(42)가 용접된다.The upper end of the second terminal pillar 27 is fixed to the second terminal plate 26 by welding in a state of being fitted to the second terminal plate 26. In addition, the lower end of the second terminal pillar 27 is joined to the second current collecting member 42 by welding. The lower protrusion 275 is inserted into the coupling hole 428 formed in the second current collecting member 42, and the lower end of the lower protrusion 275 and the second current collecting member 42 are welded.
제2단자 기둥(27)과 캡 플레이트(31) 사이에는 밀봉을 위한 실링 가스켓(55)이 제2단자 기둥(27)이 관통되는 홀에 삽입 설치되고, 캡 플레이트(31)의 아래에는 제2집전부재(42)를 지지하고 캡 플레이트(31)에서 절연하는 하부 절연부재(45)가 설치된다.A sealing gasket 55 for sealing is inserted between the second terminal pillar 27 and the cap plate 31 in a hole through which the second terminal pillar 27 penetrates, and a second portion below the cap plate 31 is provided. A lower insulating member 45 supporting the current collector member 42 and insulated from the cap plate 31 is installed.
한편, 제2단자 플레이트(26)의 하면에는 단락 홀(37)을 향하여 돌출된 단락 돌기(261)가 형성된다. 제2단자(25)는 단락 홀(37)을 덥도록 일방향으로 길게 연장되어 형성된다. 제2단자(25)와 캡 플레이트(31) 사이에는 제2단자(25)와 캡 플레이트(31)를 전기적으로 절연하는 상부 절연부재(54)가 설치된다.On the other hand, a shorting protrusion 261 protruding toward the shorting hole 37 is formed on the lower surface of the second terminal plate 26. The second terminal 25 is formed to extend in one direction to cover the short-circuit hole 37. An upper insulating member 54 is provided between the second terminal 25 and the cap plate 31 to electrically insulate the second terminal 25 and the cap plate 31.
캡 어셈블리(30)는 제1전극(11)과 제2전극(12)을 단락시키는 단락부재(56)를 포함하는 바, 단락부재(56)는 캡 플레이트(31)와 전기적으로 연결되며, 이차 전지(101)의 내부 압력이 상승할 때 변형되어 제2단자(25)와 연결된다. The cap assembly 30 includes a shorting member 56 that shorts the first electrode 11 and the second electrode 12. The shorting member 56 is electrically connected to the cap plate 31. When the internal pressure of the battery 101 rises, the battery 101 deforms and is connected to the second terminal 25.
캡 플레이트(31)에는 단락 홀(37)이 형성되며, 단락부재(56)는 단락 홀(37)에서 상부 절연부재(54)와 캡 플레이트(31) 사이에 배치된다. 또한 단락 홀(37)의 상부에는 제2단자 플레이트(26)가 단락 홀(37)을 덮도록 배치된다. 단락부재(56)는 아래로 볼록하게 호형으로 굴곡된 만곡부와 만곡부의 외측에 형성되며 캡 플레이트(31)에 고정된 테두리부를 포함한다.A shorting hole 37 is formed in the cap plate 31, and the shorting member 56 is disposed between the upper insulating member 54 and the cap plate 31 in the shorting hole 37. In addition, the second terminal plate 26 is disposed on the short circuit hole 37 to cover the short circuit hole 37. The short circuit member 56 includes a curved portion that is curved in a convex shape downward and an outer edge portion of the curved portion and fixed to the cap plate 31.
이차 전지의 내부에서 이상반응으로 가스가 발생하면 이차 전지의 내부 압력이 상승한다. 이차 전지의 내부 압력이 기 설정된 압력보다 높아지면 만곡부가 상부로 볼록하도록 변형되며, 이때, 단락 돌기(261)와 단락부재(56)가 맞닿아 단락을 유발한다.When gas is generated by an abnormal reaction in the secondary battery, the internal pressure of the secondary battery increases. When the internal pressure of the secondary battery is higher than the preset pressure, the curved portion is deformed so as to be convex upward. At this time, the shorting protrusion 261 and the shorting member 56 abut and cause a short circuit.
도 3은 본 발명의 일 실시예에 따른 이차 전지의 일부를 도시한 분해 사시도이다.3 is an exploded perspective view illustrating a part of a rechargeable battery according to an exemplary embodiment of the present invention.
도 2 및 도 3을 참조하여 설명하면, 전극 어셈블리(10)는 띠 형상의 제1전극(11), 제2전극(12) 및 제1전극(11)과 제2전극(12) 사이에 배치된 세퍼레이터(13)를 포함하며, 권취된 구조로 이루어진다. 케이스(28) 내에는 하나 또는 둘 이상의 전극 어셈블리(10)가 삽입될 수 있다.Referring to FIGS. 2 and 3, the electrode assembly 10 is disposed between the band-shaped first electrode 11, the second electrode 12, and the first electrode 11 and the second electrode 12. It includes a separator 13, it is made of a wound structure. One or more electrode assemblies 10 may be inserted in the case 28.
제1전극(11)은 양극 활물질층이 형성된 제1코팅부와 양극 활물질층이 형성되지 않은 제1전극탭(11a)를 포함하는데, 제1전극탭(11a)은 복수개가 적층된 구조로 이루어진다. 또한, 제2전극(12)은 양극 활물질층이 형성된 제2코팅부와 양극 활물질층이 형성되지 않은 제2전극탭(12a)를 포함하는데, 제2전극탭(12a)는 복수개가 적층된 구조로 이루어진다.The first electrode 11 includes a first coating part on which a positive electrode active material layer is formed and a first electrode tab 11a on which a positive electrode active material layer is not formed. The first electrode tab 11a has a structure in which a plurality of first electrode tabs 11a are stacked. . In addition, the second electrode 12 includes a second coating part on which the positive electrode active material layer is formed and a second electrode tab 12a on which the positive electrode active material layer is not formed. The second electrode tab 12a has a plurality of stacked structures. Is made of.
제1전극탭(11a)와 제2전극탭(12a)은 전극 어셈블리(10)의 상단에서 캡 플레이트(31)를 향하여 돌출되며 전극 어셈블리(10)의 폭 방향으로 서로 이격 배치된다.The first electrode tab 11a and the second electrode tab 12a protrude toward the cap plate 31 from the upper end of the electrode assembly 10 and are spaced apart from each other in the width direction of the electrode assembly 10.
제1집전부재(41)는 제1단자 기둥(23)에 접합된 지지판(411)과 제1전극탭(11a)에 접합된 전극 부착부(413) 및 지지판(411)에서 절곡되어 경사지게 형성되며 지지판(411)과 전극 부착부(413)를 연결하는 연결부(415)를 포함한다. 지지판(411)은 전극 부착부(413) 보다 더 하부에 위치한다.The first collector member 41 is bent from the support plate 411 bonded to the first terminal pillar 23, the electrode attachment portion 413 and the support plate 411 bonded to the first electrode tab 11a, and formed to be inclined. And a connection part 415 connecting the support plate 411 and the electrode attachment part 413. The support plate 411 is located below the electrode attachment portion 413.
지지판(411)은 사각형의 판 형상으로 이루어지며, 제1단자 기둥(23)의 하부에 용접으로 고정된다. 지지판(411)에는 결합 홀(418)이 형성되며 이 결합 홀(418)에 제1단자 기둥(23)의 하부에 형성된 하부 돌기(235)가 끼움된 상태에서 제1단자 기둥(23)와 지지판(411)이 용접된다.The support plate 411 has a rectangular plate shape and is fixed by welding to the lower portion of the first terminal column 23. A coupling hole 418 is formed in the support plate 411, and the first terminal pillar 23 and the support plate are inserted in the state in which the lower protrusion 235 formed below the first terminal pillar 23 is fitted in the coupling hole 418. 411 is welded.
지지판(411)에는 퓨즈 홀(416)이 형성되며 퓨즈 홀(416)이 형성된 부분은 주변보다 더 작은 단면적을 가져서 과전류가 흐를 때 용융될 수 있다. 지지판(411)에는 퓨즈 홀(416)을 감싸는 지지부재(48)가 설치될 수 있다. 전극 부착부(413)는 사각판으로 이루어지며, 전극 부착부(413)에는 통기홀(419)이 형성될 수 있다.A fuse hole 416 is formed in the support plate 411, and a portion in which the fuse hole 416 is formed may have a smaller cross-sectional area than the periphery and may melt when an overcurrent flows. The support plate 411 may be provided with a support member 48 surrounding the fuse hole 416. The electrode attachment portion 413 may be formed of a square plate, and a ventilation hole 419 may be formed in the electrode attachment portion 413.
도 4에 도시된 바와 같이 전극 부착부(413)에는 제1전극탭(11a)이 용접으로 접합된 제1접합부(81, 82)가 형성되고, 지지판(411)에는 제1단자(21)의 하단이 용접으로 접합된 제2접합부(83)가 형성된다. 제1접합부(81, 82)는 제1전극탭(11a)과 전극 부착부(413)의 초음파 용접에 의하여 형성될 수 있으며, 대략 직사각형의 단면으로 형성될 수 있다. 제1접합부(81, 82)에는 제1접합부(81, 82)를 덮는 제1보호부재(61)가 설치될 수 있다. 제1보호부재(61)는 제1집전부재(41)에서 전극 어셈블리(10)를 향하는 하면을 덮도록 설치된다.As shown in FIG. 4, the first attachment parts 81 and 82, to which the first electrode tab 11a is welded, are formed in the electrode attachment part 413, and the first plate 21 is formed in the support plate 411. A second joining portion 83 having a lower end joined by welding is formed. The first junctions 81 and 82 may be formed by ultrasonic welding of the first electrode tab 11a and the electrode attachment part 413 and may have a substantially rectangular cross section. A first protective member 61 covering the first junctions 81 and 82 may be installed at the first junctions 81 and 82. The first protective member 61 is installed to cover the bottom surface of the first current collecting member 41 toward the electrode assembly 10.
제1보호부재(61)는 제1접합부(81, 82)를 전체적으로 덮고 제1집전부재(41)까지 연장되어 제1집전부재(41)의 일부를 덮도록 설치된다. 제1보호부재(61)는 겔 레이어(gel layer)로 이루어진다. 제1보호부재(61)는 제1접합부(81, 82)에 도포되며 투명한 물질로 이루어질 수 있다. 제1보호부재(61)는 분산매에 분산상 입자가 혼합되어 분산상 입자가 이차적인 결합을 형성하여 겔 상태를 유지한다. 분산상 입자인 콜로이드와 분산매의 소재에 대해서는 제한하지 않으며 다양한 소재가 적용될 수 있다.The first protective member 61 covers the first joints 81 and 82 as a whole and extends to the first current collecting member 41 to cover a part of the first current collecting member 41. The first protective member 61 is made of a gel layer. The first protective member 61 is applied to the first bonding parts 81 and 82 and may be made of a transparent material. The first protective member 61 maintains a gel state by dispersing dispersed phase particles in a dispersion medium to form secondary bonds of the dispersed phase particles. The material of the colloid and the dispersion medium, which are dispersed phase particles, is not limited and various materials may be applied.
제2접합부(83)는 지지판(411)과 제1단자(21)의 레이저 용접에 의하여 형성될 수 있으며, 대략 고리 형상의 단면으로 형성될 수 있다. 제2접합부(83)에는 제2접합부(83)를 덮는 제2보호부재(62)가 설치될 수 있다.The second junction part 83 may be formed by laser welding of the support plate 411 and the first terminal 21, and may have a substantially annular cross section. A second protective member 62 may be installed on the second junction 83 to cover the second junction 83.
제2보호부재(62)는 제2접합부(83)를 전체적으로 덮고 제1집전부재(41)까지 연장되어 제1집전부재(41)의 일부를 덮도록 설치된다. 제2보호부재(62)는 겔 레이어(gel layer)로 이루어진다. 제2보호부재(62)는 제2접합부(83)에 도포되며 투명한 물질로 이루어질 수 있다. 제2보호부재(62)는 분산매에 분산상 입자가 혼합되어 분산상 입자가 이차적인 결합을 형성하여 겔 상태를 유지한다. The second protective member 62 covers the second joint portion 83 as a whole and extends to the first current collecting member 41 to cover a portion of the first current collecting member 41. The second protective member 62 is made of a gel layer. The second protective member 62 is applied to the second bonding portion 83 and may be made of a transparent material. The second protective member 62 maintains the gel state by dispersing the dispersed phase particles in the dispersion medium to form secondary bonds of the dispersed phase particles.
제2집전부재(42)는 제2단자 기둥(27)에 접합된 지지판(421)과 지지판(421)에서 전극 어셈블리(10)를 향하여 절곡되어 제2전극탭(12a)에 직접 접합된 전극 부착부(423)을 포함한다. 전극 부착부(423)는 지지판(421)의 폭방향 단부에서 전극 어셈블리(10)와 평행하도록 절곡된다.The second current collecting member 42 is attached to the support plate 421 bonded to the second terminal pillar 27 and the electrode plate 10 bent toward the electrode assembly 10 from the support plate 421 and directly bonded to the second electrode tab 12a. Part 423 is included. The electrode attachment portion 423 is bent to be parallel to the electrode assembly 10 at the widthwise end of the support plate 421.
지지판(421)은 사각형의 판 형상으로 이루어지며, 제2단자 기둥(27)의 하부에 용접으로 고정된다. 지지판(421)에는 결합 홀(428)이 형성되며 이 결합 홀(428)에 제2단자 기둥(27)의 하부에 형성된 하부 돌기(275)가 끼움된 상태에서 제2단자 기둥(27)와 지지판(421)이 용접된다.The support plate 421 has a rectangular plate shape and is fixed by welding to the lower portion of the second terminal column 27. A coupling hole 428 is formed in the supporting plate 421, and the second terminal pillar 27 and the supporting plate are inserted in the state in which the lower protrusion 275 formed below the second terminal pillar 27 is fitted in the coupling hole 428. 421 is welded.
도 5에 도시된 바와 같이 전극 부착부(423)에는 제2전극탭(12a)이 용접으로 접합된 제3접합부(85, 86)가 형성되고, 지지판(421)에는 제2단자(25)가 용접으로 접합된 제4접합부(87)가 형성된다. 제3접합부(85, 86)는 제2전극탭(12a)과 전극 부착부(423)의 초음파 용접에 의하여 형성될 수 있으며, 대략 직사각형의 단면으로 형성될 수 있다. 제3접합부(85, 86)에는 제3접합부(85, 86)를 덮는 제3보호부재(63)가 설치될 수 있다.As shown in FIG. 5, the third attachment parts 85 and 86, to which the second electrode tab 12a is welded, are formed in the electrode attachment part 423, and the second terminal 25 is formed in the support plate 421. The fourth joint portion 87 joined by welding is formed. The third junction portions 85 and 86 may be formed by ultrasonic welding of the second electrode tab 12a and the electrode attachment portion 423, and may have a substantially rectangular cross section. Third protection members 63 may be installed on the third junctions 85 and 86 to cover the third junctions 85 and 86.
제3보호부재(63)는 제3접합부(85, 86)를 전체적으로 덮고 제2집전부재(42)까지 연장되어 제2집전부재(42)의 일부를 덮도록 설치된다. 제3보호부재(63)는 겔 레이어(gel layer)로 이루어진다. 제3보호부재(63)는 제3접합부(85, 86)에 도포되며 투명한 물질로 이루어질 수 있다. 제3보호부재(63)는 분산매에 분산상 입자가 혼합되어 분산상 입자가 이차적인 결합을 형성하여 겔 상태를 유지한다. The third protective member 63 covers the third joint portions 85 and 86 as a whole and extends to the second current collecting member 42 to cover a portion of the second current collecting member 42. The third protective member 63 is made of a gel layer. The third protective member 63 may be applied to the third junctions 85 and 86 and made of a transparent material. The third protective member 63 maintains a gel state by dispersing dispersed phase particles in a dispersion medium to form secondary bonds of the dispersed phase particles.
제4접합부(87)는 지지판(421)과 제2단자(25)의 레이저 용접에 의하여 형성될 수 있으며, 대략 고리 형상의 단면으로 형성될 수 있다. 제4접합부(87)에는 제4접합부(87)를 덮는 제4보호부재(64)가 설치될 수 있다.The fourth junction part 87 may be formed by laser welding of the support plate 421 and the second terminal 25, and may have a substantially annular cross section. A fourth protective member 64 covering the fourth junction 87 may be installed in the fourth junction 87.
제4보호부재(64)는 제4접합부(87)를 전체적으로 덮고 제2집전부재(42)까지 연장되어 제2집전부재(42)의 일부를 덮도록 설치된다. 제4보호부재(64)는 겔 레이어(gel layer)로 이루어진다. 제4보호부재(64)는 제4접합부(87)에 도포되며 투명한 물질로 이루어질 수 있다. 제4보호부재(64)는 분산매에 분산상 입자가 혼합되어 분산상 입자가 이차적인 결합을 형성하여 겔 상태를 유지한다. The fourth protective member 64 is installed to cover the fourth joint part 87 as a whole and extend to the second current collecting member 42 to cover a part of the second current collecting member 42. The fourth protective member 64 is made of a gel layer. The fourth protective member 64 is applied to the fourth joint portion 87 and may be made of a transparent material. The fourth protective member 64 maintains a gel state by dispersing dispersed phase particles in a dispersion medium to form secondary bonds of the dispersed phase particles.
제1보호부재(61), 제2보호부재(62), 제3보호부재(63) 및 제4보호부재(64)는 수지로 이루어질 수 있으며, 두께는 0.1mm 내지 0.9mm로 이루어질 수 있으며 바람직하게는 0.5mm 이하로 이루어질 수 있다. 또한, 제1보호부재(61), 제2보호부재(62), 제3보호부재(63) 및 제4보호부재(64)는 25에서 100cps 내지 10,000cps의 점도를 갖도록 이루어질 수 있다.The first protective member 61, the second protective member 62, the third protective member 63 and the fourth protective member 64 may be made of a resin, the thickness may be made of 0.1mm to 0.9mm and preferably It may be made up to 0.5mm or less. In addition, the first protective member 61, the second protective member 62, the third protective member 63 and the fourth protective member 64 may be made to have a viscosity of 25 to 100cps to 10,000cps.
접합부에는 용접에 의하여 금속 입자들이 부착될 수 있다. 이러한 금속 입자가 전해액과 혼합되거나 전극 어셈블리(10) 내부로 침투하면 충전과 방전에 나쁜 영향을 미쳐서 전지의 수명이 감소되거나 이상 반응을 유발할 수 있다. Metal particles may be attached to the joint by welding. When the metal particles are mixed with the electrolyte or penetrated into the electrode assembly 10, the metal particles may adversely affect charging and discharging, thereby reducing the life of the battery or causing an abnormal reaction.
그러나 본 실시예와 같이 겔 상태의 보호부재들을 도포하면 이물질이 침입하는 것을 방지할 수 있다. 또한 보호부재들이 겔 상태로 이루어지므로 외부에서 가해지는 진동이나 충격에 의하여 보호부재가 탈락하는 것을 방지할 수 있다.However, applying the protective member in the gel state as in the present embodiment can prevent foreign matter from invading. In addition, since the protective members are made of a gel state, it is possible to prevent the protective member from falling off due to vibration or shock applied from the outside.
이하에서는 본 발명의 제2실시예에 따른 이차 전지에 대해서 설명한다. 도 7은 본 발명의 제2실시예에 따른 제1집전부재에 제1보호부재 및 제2보호부재가 설치된 상태를 도시한 사시도이고, 도 8은 본 발명의 제2실시예에 따른 제2집전부재에 제3보호부재 및 제4보호부재가 설치된 상태를 도시한 사시도이다.Hereinafter, a rechargeable battery according to a second exemplary embodiment of the present invention will be described. 7 is a perspective view illustrating a state in which a first protective member and a second protective member are installed in a first current collecting member according to a second embodiment of the present invention, and FIG. 8 is a second current collecting unit according to a second embodiment of the present invention. It is a perspective view which shows the state in which the 3rd protective member and the 4th protective member were installed in the member.
본 제2실시예에 따른 이차 전지는 보호부재를 제외하고는 상기한 제1실시예에 따른 이차 전지와 동일한 구조로 이루어지므로 동일한 구조에 대한 중복 설명은 생략한다.Since the rechargeable battery according to the second exemplary embodiment has the same structure as the rechargeable battery according to the first exemplary embodiment except for the protection member, redundant description of the same structure will be omitted.
도 7를 참조하여 설명하면, 전극 부착부(413)에는 제1전극탭(11a)이 용접으로 접합된 제1접합부(81, 82)가 형성되고, 지지판(411)에는 제1단자(21)가 용접으로 접합된 제2접합부(83)가 형성된다. 제1접합부(81, 82)는 제1전극탭(11a)과 전극 부착부(413)의 초음파 용접에 의하여 형성될 수 있으며, 대략 직사각형의 단면으로 형성될 수 있다. 제1접합부(81, 82)에는 제1접합부(81, 82)를 덮는 제1보호부재(91)가 설치될 수 있다.Referring to FIG. 7, first electrode portions 81 and 82, to which the first electrode tab 11a is welded, are formed in the electrode attachment portion 413, and the first terminal 21 is formed in the support plate 411. The second joint portion 83 joined by welding is formed. The first junctions 81 and 82 may be formed by ultrasonic welding of the first electrode tab 11a and the electrode attachment part 413 and may have a substantially rectangular cross section. First protective members 91 may be installed at the first junctions 81 and 82 to cover the first junctions 81 and 82.
제1보호부재(91)는 제1접합부(81, 82)를 전체적으로 덮고 제1집전부재(41)까지 연장되어 제1집전부재(41)의 일부를 덮도록 설치된다. 제1보호부재(91)는 접착층을 갖는 필름으로 이루어질 수 있다. 제1보호부재(91)는 제1접합부에 부착되며 합성 수지로 이루어질 수 있다.The first protective member 91 covers the first joints 81 and 82 as a whole and extends to the first current collecting member 41 to cover a part of the first current collecting member 41. The first protective member 91 may be formed of a film having an adhesive layer. The first protective member 91 is attached to the first bonding portion and may be made of synthetic resin.
제2접합부(83)는 지지판(411)과 제1단자(21)의 레이저 용접에 의하여 형성될 수 있으며, 대략 고리 형상의 단면으로 형성될 수 있다. 제2접합부(83)에는 제2접합부(83)를 덮는 제2보호부재(92)가 설치될 수 있다.The second junction part 83 may be formed by laser welding of the support plate 411 and the first terminal 21, and may have a substantially annular cross section. A second protective member 92 covering the second junction 83 may be installed in the second junction 83.
제2보호부재(92)는 제2접합부(83)를 전체적으로 덮고 제1집전부재(41)까지 연장되어 제1집전부재(41)의 일부를 덮도록 설치된다. 제2보호부재(92)는 접착층을 갖는 필름으로 이루어질 수 있다. 제2보호부재(92)는 제2접합부(83)에 부착되며 합성 수지로 이루어질 수 있다.The second protective member 92 covers the second joint portion 83 as a whole and extends to the first current collecting member 41 to cover a portion of the first current collecting member 41. The second protective member 92 may be formed of a film having an adhesive layer. The second protective member 92 is attached to the second bonding portion 83 and may be made of synthetic resin.
도 8을 참조하여 설명하면, 전극 부착부(423)에는 제2전극탭(12a)이 용접으로 접합된 제3접합부(85, 86)가 형성되고, 지지판(421)에는 제2단자(25)가 용접으로 접합된 제4접합부(87)가 형성된다. 제3접합부(85, 86)는 제2전극탭(12a)과 전극 부착부(423)의 초음파 용접에 의하여 형성될 수 있으며, 대략 직사각형의 단면으로 형성될 수 있다. 제3접합부(85, 86)에는 제3접합부(85, 86)를 덮는 제3보호부재(93)가 설치될 수 있다.Referring to FIG. 8, third joining portions 85 and 86 formed by welding the second electrode tab 12a to the electrode attachment portion 423 are formed on the electrode attachment portion 423, and the second terminal 25 is formed on the support plate 421. The fourth joint part 87 joined by welding is formed. The third junction portions 85 and 86 may be formed by ultrasonic welding of the second electrode tab 12a and the electrode attachment portion 423, and may have a substantially rectangular cross section. A third protective member 93 covering the third junctions 85 and 86 may be installed in the third junctions 85 and 86.
제3보호부재(93)는 제3접합부(85, 86)를 전체적으로 덮고 제2집전부재(42)까지 연장되어 제2집전부재(42)의 일부를 덮도록 설치된다. 제3보호부재(93)는 접착층을 갖는 필름으로 이루어질 수 있다. 제3보호부재(93)는 제3접합부(85, 86)에 부착되며 합성 수지로 이루어질 수 있다.The third protective member 93 covers the third joints 85 and 86 as a whole and extends to the second current collecting member 42 to cover a part of the second current collecting member 42. The third protective member 93 may be formed of a film having an adhesive layer. The third protection member 93 may be attached to the third joint portions 85 and 86 and made of synthetic resin.
제4접합부(87)는 지지판(421)과 제2단자(25)의 레이저 용접에 의하여 형성될 수 있으며, 대략 고리 형상의 단면으로 형성될 수 있다. 제4접합부(87)에는 제4접합부(87)를 덮는 제4보호부재(94)가 설치될 수 있다.The fourth junction part 87 may be formed by laser welding of the support plate 421 and the second terminal 25, and may have a substantially annular cross section. A fourth protective member 94 covering the fourth junction 87 may be installed in the fourth junction 87.
제4보호부재(94)는 제4접합부(87)를 전체적으로 덮고 제2집전부재(42)까지 연장되어 제2집전부재(42)의 일부를 덮도록 설치된다. 제4보호부재(94)는 접착층을 갖는 필름으로 이루어질 수 있다. 제4보호부재(94)는 제4접합부(87)에 부착되며 합성 수지로 이루어질 수 있다.The fourth protective member 94 covers the fourth joint portion 87 as a whole and extends to the second current collecting member 42 to cover a portion of the second current collecting member 42. The fourth protective member 94 may be formed of a film having an adhesive layer. The fourth protective member 94 is attached to the fourth joint portion 87 and may be made of synthetic resin.
이상 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명이 이에 한정되는 것은 아니며 특허청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시할 수 있다.While the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings.
- 부호의 설명 -Description of the sign
101: 이차 전지 10: 전극 어셈블리101: secondary battery 10: electrode assembly
11: 양극 11a: 제1전극탭11: anode 11a: first electrode tab
12: 음극 12a: 제2전극탭12: cathode 12a: second electrode tab
13: 세퍼레이터 21: 제1단자13: Separator 21: Terminal 1
22: 제1단자 플레이트 23: 제1단자 기둥22: first terminal plate 23: first terminal pillar
231: 기둥부 232: 플랜지부231: pillar portion 232: flange portion
235: 하부 돌기 25: 제2단자235: lower protrusion 25: second terminal
26: 제2단자 플레이트 261: 단락 돌기26: second terminal plate 261: short circuit projection
27: 제2단자 기둥 271: 기둥부27: second terminal pillar 271: pillar portion
272: 플랜지부 275: 하부 돌기272: flange portion 275: lower projection
28: 케이스 30: 캡 어셈블리28: case 30: cap assembly
31: 캡 플레이트 41: 제1집전부재31: cap plate 41: first collecting member
411: 지지판 413: 전극 부착부411: support plate 413: electrode attachment portion
415: 연결부 416: 퓨즈 홀415: connection portion 416: fuse hole
418: 결합 홀 419: 통기홀418: coupling hole 419: ventilation hole
42: 제2집전부재 421: 지지판42: second collector member 421: support plate
423: 전극 부착부 428: 결합 홀423: electrode attachment portion 428: coupling hole
43, 45: 하부 절연부재 48: 지지부재43, 45: lower insulation member 48: support member
54: 상부 절연부재 55, 59: 실링 가스켓54: upper insulation member 55, 59: sealing gasket
56: 단락부재 58: 연결부재56: short circuit member 58: connecting member
61, 91: 제1보호부재 62, 92: 제2보호부재61, 91: first protective member 62, 92: second protective member
63, 93: 제3보호부재 64, 94: 제4보호부재63, 93: third protective member 64, 94: fourth protective member
81, 82: 제1접합부 83: 제2접합부81, 82: first junction 83: second junction
85, 86: 제3접합부 87: 제4접합부85, 86: third junction 87: fourth junction

Claims (13)

  1. 제1전극, 제2전극을 포함하는 전극 어셈블리;An electrode assembly comprising a first electrode and a second electrode;
    상기 전극 어셈블리를 수용하는 케이스;A case accommodating the electrode assembly;
    상기 케이스에 결합된 캡 플레이트;A cap plate coupled to the case;
    상기 제1전극과 전기적으로 연결되며 상기 캡 플레이트의 외측으로 돌출된 제1단자;A first terminal electrically connected to the first electrode and protruding outward of the cap plate;
    상기 제1전극과 상기 제1단자를 전기적으로 연결하는 제1집전부재; 및A first current collector electrically connecting the first electrode and the first terminal; And
    상기 제1집전부재에서 상기 전극 어셈블리를 향하는 면을 덮는 제1보호부재;A first protective member covering a surface from the first current collecting member toward the electrode assembly;
    를 포함하는 이차 전지.Secondary battery comprising a.
  2. 제1항에 있어서,The method of claim 1,
    상기 제1보호부재는 상기 제1전극과 상기 제1집전부재가 접합된 제1접합부를 덮는 이차 전지.The first protective member covers a first junction where the first electrode and the first current collecting member are bonded to each other.
  3. 제1항에 있어서,The method of claim 1,
    상기 제1보호부재는 겔 레이어로 이루어진 이차 전지.The first protective member is a secondary battery consisting of a gel layer.
  4. 제2항에 있어서,The method of claim 2,
    상기 제1보호부재는 25에서 100cps 내지 10000cps의 점도를 갖는 이차 전지.The first protective member has a viscosity of 25 to 100 cps to 10000 cps.
  5. 제1항에 있어서,The method of claim 1,
    상기 제1보호부재는 접착층을 갖는 필름으로 이루어진 이차 전지.The first protective member is a secondary battery made of a film having an adhesive layer.
  6. 제1항에 있어서,The method of claim 1,
    상기 제1집전부재는 상기 캡 플레이트와 마주하도록 배치되며, 상기 제1접합부는 상기 제1전극과 상기 제1집전부재가 용접된 부분인 이차 전지.The first current collecting member is disposed to face the cap plate, and the first junction part is a portion in which the first electrode and the first current collecting member are welded.
  7. 제1항에 있어서,The method of claim 1,
    상기 제1단자와 상기 제1집전부재가 접합된 제2접합부를 덮는 제2보호부재를 더 포함하는 이차 전지.The secondary battery further comprises a second protective member covering the second junction portion to which the first terminal and the first current collecting member are bonded.
  8. 제7항에 있어서,The method of claim 7, wherein
    상기 제2보호부재는 겔 레이어로 이루어진 이차 전지.The second protective member is a secondary battery consisting of a gel layer.
  9. 제7항에 있어서,The method of claim 7, wherein
    상기 제2보호부재는 접착층을 갖는 필름으로 이루어진 이차 전지.The second protective member is a secondary battery made of a film having an adhesive layer.
  10. 제7항에 있어서,The method of claim 7, wherein
    상기 제1단자는 판상의 제1단자 플레이트와 상기 제1단자 플레이트를 관통하여 설치된 제1단자 기둥을 포함하고, 상기 제2접합부는 상기 제1단자 기둥과 상기 제1집접부재가 용접된 부분인 이차 전지.The first terminal includes a plate-shaped first terminal plate and a first terminal pillar installed through the first terminal plate, and the second joining portion is a portion in which the first terminal pillar and the first contact member are welded. Secondary battery.
  11. 제1항에 있어서,The method of claim 1,
    상기 제2전극과 전기적으로 연결되며 상기 캡 플레이트의 외측으로 돌출된 제2단자, 상기 제2전극과 상기 제2단자를 전기적으로 연결하는 제2집전부재, 상기 제2전극과 상기 제2집전부재가 접합된 제3접합부를 덮는 제3보호부재, 상기 제2단자와 상기 제2전극이 접합된 제4접합부를 덮는 제4보호부재를 더 포함하는 이차 전지.A second terminal electrically connected to the second electrode and protruding outwardly of the cap plate, a second current collecting member electrically connecting the second electrode and the second terminal, the second electrode and the second current collecting member; And a fourth protection member covering a third junction in which the second junction is bonded, and a fourth protection member covering a fourth junction in which the second terminal and the second electrode are bonded to each other.
  12. 제11항에 있어서,The method of claim 11,
    상기 제3보호부재 또는 상기 제4보호부재는 겔 레이어로 이루어진 이차 전지.The third protective member or the fourth protective member is a secondary battery consisting of a gel layer.
  13. 제11항에 있어서,The method of claim 11,
    상기 제3보호부재 또는 상기 제4보호부재는 접착층을 갖는 필름으로 이루어진 이차 전지.The third protective member or the fourth protective member is a secondary battery made of a film having an adhesive layer.
PCT/KR2017/001164 2016-04-26 2017-02-03 Rechargeable battery having protection member WO2017188563A1 (en)

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