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WO2017179777A1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
WO2017179777A1
WO2017179777A1 PCT/KR2016/009923 KR2016009923W WO2017179777A1 WO 2017179777 A1 WO2017179777 A1 WO 2017179777A1 KR 2016009923 W KR2016009923 W KR 2016009923W WO 2017179777 A1 WO2017179777 A1 WO 2017179777A1
Authority
WO
WIPO (PCT)
Prior art keywords
case
fixing
current collecting
secondary battery
electrode
Prior art date
Application number
PCT/KR2016/009923
Other languages
French (fr)
Korean (ko)
Inventor
윤준서
Original Assignee
삼성에스디아이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성에스디아이 주식회사 filed Critical 삼성에스디아이 주식회사
Publication of WO2017179777A1 publication Critical patent/WO2017179777A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of the 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
    • H01M50/547—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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/579—Devices or arrangements for the interruption of current in response to shock
    • 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
    • H01M2200/20—Pressure-sensitive devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a secondary battery.
  • 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.
  • Representative secondary batteries include nickel cadmium (Ni-Cd) batteries, nickel hydride (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) secondary batteries.
  • the lithium ion secondary battery has an operating voltage about three times higher than that of a nickel cadmium battery or a nickel hydride battery which is widely used as a power source for portable electronic equipment. In addition, it is widely used in view of high energy density per unit weight.
  • the secondary battery mainly uses a lithium oxide as a positive electrode active material and a carbon material as a negative electrode active material.
  • a battery is classified into a liquid electrolyte battery and a polymer electrolyte battery according to the type of electrolyte.
  • a battery using a liquid electrolyte is called a lithium ion battery, and a battery using a polymer electrolyte is called a lithium polymer battery.
  • a secondary battery capable of preventing damage such as deformation caused by the impact may be provided.
  • a secondary battery includes an electrode assembly including a first electrode and a second electrode, a case in which the electrode assembly is embedded, a cap plate coupled to an opening of the case, and having a terminal hole, and a cap plate.
  • a reinforcing part for fixing between the lead tab and the inside of the case may be installed inside the case.
  • the reinforcing part may include a first reinforcing member connecting the first current collecting tab to the inside of the case and a second reinforcing member connecting the second current collecting tab to the inside of the case.
  • the first reinforcing member may include a first fixing body fixed inside the case and a first fixing protrusion protruding from the first fixing body and connected to the first current collecting tab.
  • the first fixing body may be fixed to the inside of the case by an adhesive.
  • the first fixing protrusion may have a first recess in which the first current collecting tab is seated.
  • the second reinforcing member may include a second fixing body fixed inside the case, and a second fixing protrusion protruding from the second fixing body and connected to the second current collecting tab.
  • the second fixing body may be fixed to the inside of the case by an adhesive.
  • the second fixing protrusion may have a second recess in which the second current collecting tab is seated.
  • the first fixing body and the second fixing body may be connected to the inside of the case by the connection body.
  • the connecting body can be fixed by an adhesive inside the case.
  • the first fixing protrusion may protrude inside the case.
  • a first fixing groove into which the first fixing protrusion is inserted may be formed in the first fixing body.
  • the second fixing protrusion may protrude inside the case.
  • a second fixing groove into which the second fixing protrusion is inserted may be formed in the second fixing body.
  • a steel member is installed inside the case of the secondary battery, and the protruding end of the current collecting tab may be fixed while reinforcing the strength of the case. Therefore, even when an external force is applied from the outside of the case, the lead tab and the electrode assembly are prevented from being deformed and damaged, thereby improving durability of the secondary battery.
  • FIG. 1 is a perspective view schematically illustrating 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 the rechargeable battery of FIG. 1.
  • FIG 3 is a perspective view schematically showing a first reinforcing member of the reinforcing portion according to the first embodiment of the present invention.
  • FIG. 4 is a perspective view schematically showing a second reinforcing member of the reinforcing portion according to the first embodiment of the present invention.
  • FIG. 5 is a cross-sectional view schematically illustrating a rechargeable battery according to a second exemplary embodiment of the present invention.
  • FIG. 6 is a perspective view schematically illustrating a first reinforcing member of the reinforcing part of FIG. 5.
  • FIG. 7 is a perspective view schematically illustrating a second reinforcement member of the reinforcement part of FIG. 5.
  • FIG. 8 is a perspective view schematically illustrating a reinforcement part of a rechargeable battery according to a third exemplary embodiment of the present invention.
  • FIG. 1 is a perspective view schematically illustrating 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 the rechargeable battery of FIG. 1.
  • the secondary battery 100 includes an electrode assembly 10 having a first electrode 11 and a second electrode 12, and A case 15 having the electrode assembly 10 embedded therein, a cap plate 20 coupled to the opening of the case 15 and having a terminal hole formed therein, and installed in the cap plate 20 and having a first electrode terminal 21.
  • the electrode terminals 21 and 22 including the second electrode terminal 22, the first current collecting tab 51 and the electrode assembly 10 connecting the electrode assembly 10 to the first electrode terminal 21 may be removed.
  • the reinforcement part 30 which fixes between the lead tabs 51 and 52 and the inside of the case 15 is provided in the case 15.
  • the electrode assembly 10 arranges the first electrode 11 (hereinafter referred to as “cathode”) and the second electrode 12 (hereinafter referred to as “anode”) on both sides of the separator 13 as an insulator, and the cathode ( 11), the separator 13 and the positive electrode 12 may be formed by twisting in a jellyroll state.
  • the negative electrode 11 and the positive electrode 12 each include the coating portions 11a and 12a in which the active material is applied to the current collector of the metal plate, and the plain portions 11b and 12b formed of the current collector exposed without applying the active material. Include.
  • the uncoated portion 11b of the negative electrode 11 is formed at one end of the negative electrode 11 along the negative electrode 11 to be wound.
  • the uncoated portion 12b of the anode 12 is formed at one end of the anode 12 along the anode 12 to be wound. Therefore, the uncoated portions 11b and 12b are disposed at both ends of the electrode assembly 10, respectively.
  • the case 15 is formed of a substantially rectangular parallelepiped to set a space for accommodating the electrode assembly 10 and the electrolyte therein, and forms an opening connecting the external and internal spaces on one surface of the rectangular parallelepiped. The opening allows insertion of the electrode assembly 10 into the case 15.
  • the cap plate 20 is installed in the opening of the case 15 to seal the case 15.
  • the case 15 and the cap plate 20 may be made of aluminum and welded to each other.
  • the cap plate 20 includes an electrolyte injection hole 29, a vent hole 24, and a terminal hole.
  • the electrolyte injection hole 29 couples the cap plate 20 to the case 15, and then injects the electrolyte into the case 15. After the electrolyte injection, the electrolyte injection opening 29 is sealed with a sealing stopper 27.
  • the vent hole 24 is formed to discharge the internal pressure of the secondary battery 100.
  • the electrode terminals 21 and 22 are configured of the first electrode terminal 21 and the second electrode terminal 22, and are installed in the cap plate 20 and electrically connected to the electrode assembly 10.
  • the first electrode terminal 21 is a negative electrode terminal
  • the second electrode terminal 22 is composed of a positive electrode terminal.
  • the negative electrode terminal 21 is electrically connected to the negative electrode 11 of the electrode assembly 10, and the positive electrode terminal 22 is electrically connected to the cap plate 20 by welding or the like, so that the second current collecting tab 52 is connected to the positive electrode. Is connected via).
  • the negative electrode terminal 21 may pass through the terminal hole, and one end may be connected to the first current collecting tab 51, and the other end may protrude out of the cap plate 20.
  • the positive terminal 22 may pass through the terminal hole, and one end may be connected to the second current collecting tab 52, and the other end may protrude to the outside of the cap plate 20.
  • the inside of the case 15 is provided with a reinforcing portion 30 to prevent deformation due to external impact.
  • FIG. 3 is a perspective view schematically showing a first reinforcing member of the reinforcing part according to the first embodiment of the present invention
  • FIG. 4 is a perspective view schematically showing a second reinforcing member of the reinforcing part according to the first embodiment of the present invention. to be.
  • the reinforcement part 30 may include a first reinforcement member 31 connecting the first current collecting tab 51 and the inside of the case 15 to the inside of the case 15.
  • the second reinforcing member 33 may connect the second current collecting tab 52 and the inside of the case 15 to the inside of the case 15.
  • the first reinforcing member 31 may be fixed to be positioned on the bottom surface of the case 15 to support the first current collecting tab 51.
  • the first reinforcing member 31 may be fixed in a state located on a bottom surface of the case 15.
  • the first reinforcement member 31 may include a first fixing body 31a fixed to the inside of the case 15 and a first protrusion protruding from the first fixing body 31a and connected to the first current collecting tab 51. It may include a fixing protrusion (31b).
  • the first fixing body 31a is fixed to the bottom of the case 15 so that one side of the first fixing body 31a is in contact with the bottom of the case 15 and the other side of the first fixing body 31a is in contact with the inner wall of the case 15. Can be. That is, the first fixing body 31a may be fixed in a state where it is located at a corner portion of the inner space of the case 15.
  • the first fixing body 31a is fixed by the adhesive 32 in the case 15 in the present embodiment.
  • the first fixing body 31a is not necessarily limited to being fixed with an adhesive, but may be fixed by fitting coupling or a predetermined fastening member (not shown).
  • the first fixing protrusion 31b may protrude from the first fixing body 31a.
  • the first fixing protrusion 31b may protrude in the direction of the first current collecting tab 51 from the first fixing body 31a. In this way, the first fixing protrusion 31b protrudes from the first fixing body 31a so as to connect the first fixing body 31a and the first current collecting tab 51. That is, the first current collecting tab 51 may be supported in contact with the first fixing protrusion 31b.
  • the first fixing protrusion 31b may protrude from an inner wall surface of the case 15 at a predetermined distance from an upper side of the first fixing body 31a.
  • the first concave portion 31c may be formed on the side surface of the first fixing protrusion 31b.
  • the first concave portion 31c may be formed on a side surface of the first fixing protrusion 31b that faces the inner wall surface.
  • the first concave portion 31c may be formed in a round shape on the side surface of the first fixing protrusion 31b to be positioned in contact with the first current collecting tab 51.
  • the first current collecting tab 51 may be positioned between the inner wall surface of the case 15 and the first fixing protrusion 31b and in contact with the first recess 31c.
  • the first current collecting tab 51 may be fixed to the first concave portion 31c, or may be positioned in contact with the first concave portion 31c in a detachable state.
  • the case 15 is located between the inner wall surface of the case 15 and the first fixing protrusion 31b while the first current collecting tab 51 is in contact with and supported by the first recess 31c.
  • the first current collecting tab 51 may be supported by the first fixing protrusion 31b to prevent deformation caused by the external force. Therefore, even when an external force such as pressing or hitting is applied to one side of the secondary battery 100, the first current collecting tab 51 is not deformed, thereby improving durability.
  • the second reinforcing member 33 may be fixed to be positioned on the bottom surface of the case 15 to support the second current collecting tab 52.
  • the second reinforcing member 33 may be fixed in a state spaced apart from the first reinforcing member 31 on the inner bottom surface of the case 15.
  • the second reinforcing member 33 has a second fixing body 33a fixed to the inside of the case 15 and a second projecting portion protruding from the second fixing body 33a and connected to the second current collecting tab 52. It may include a fixing protrusion (33b).
  • the second fixing body 33a is fixed to the bottom surface of the case 15 so that one side surface is in contact with the bottom surface of the case 15 and the other side surface is fixed in contact with the inner wall surface of the case 15. Can be. That is, the second fixing body 33a may be fixed in a state in which the second fixing body 33a is located at another corner portion of the inside of the case 15 while being spaced apart from the first fixing body 31a in the inner space of the case 15.
  • the second fixing body 33a is fixed by the adhesive 32 inside the case 15.
  • the second fixing body 33a is not necessarily limited to being fixed with an adhesive, but may be fixed by fitting coupling or a predetermined fastening member (not shown).
  • the second fixing protrusion 33b may protrude from the second fixing body 33a.
  • the second fixing protrusion 33b may protrude in the direction of the second current collecting tab 52 from the second fixing body 33a. As described above, the second fixing protrusion 33b protrudes from the second fixing body 33a so as to connect the second fixing body 33a and the second current collecting tab 52. That is, the second current collecting tab 52 may be supported in contact with the second fixing protrusion 33b.
  • the second fixing protrusion 33b may protrude in a state spaced apart from the inner wall surface of the case 15 by a predetermined distance from the upper side of the second fixing body 33a.
  • the second concave portion 33c may be formed on the side surface of the second fixing protrusion 33b.
  • the second concave portion 33c may be formed on a side surface of the second fixing protrusion 33b that faces the inner wall surface.
  • the second concave portion 33c may be formed in a round shape at the side of the second fixing protrusion 33b to be positioned in contact with the second current collecting tab 52.
  • the second current collecting tab 52 may be positioned between the inner wall surface of the case 15 and the second fixing protrusion 33b while being in contact with the second recess 33c.
  • the second current collecting tab 52 may be fixed to the second recess 33c or may be positioned in contact with the second recess 33c in a detachable state.
  • the case 15 is located between the inner wall surface of the case 15 and the second fixing protrusion 33b while the second current collecting tab 52 is in contact with and supported by the second recess 33c.
  • the second current collecting tab 52 may be caught by the second fixing protrusion 33b to prevent deformation due to the external force. Therefore, even when an external force such as pressing or hitting is applied from the other side of the secondary battery 100, the second current collecting tab 52 is not deformed, thereby improving durability.
  • the first current collecting tab 51 and the first collecting member 51 and the first reinforcing member 31 and the second reinforcing member 33 are installed inside the case 15 while reinforcing the strength of the case 15. It is possible to fix the protruding end of the two current collecting tabs 52. Therefore, even when an external force is applied from the outside of the case 15, the lead tabs 51 and 52 and the electrode assembly 10 may be prevented from being deformed and damaged, thereby improving durability of the secondary battery 100.
  • FIG. 5 is a cross-sectional view schematically illustrating a rechargeable battery according to a second exemplary embodiment of the present invention
  • FIG. 6 is a perspective view schematically illustrating a first reinforcing member of the reinforcing part of FIG. 5
  • FIG. 7 is a reinforcing part of FIG. 5.
  • FIGS. 1 to 4 refer to the same or similar members of the same or similar function. The detailed description of the same reference numerals will be omitted below.
  • a first fixing groove 131d is formed in the first fixing body 131a, and the second fixing body is formed.
  • a second fixing groove 133d is formed in 133a.
  • first fixing protrusion 135 protrudes inside the installation position of the first fixing body 31a in the case 15.
  • second fixing protrusion 137 protrudes inside the installation position of the second fixing body 133a in the case 15.
  • the first fixing body 131a is inserted into the first fixing groove 131d to be fixed to the inside of the case 15, and the second fixing body 133a is fixed to the second.
  • the protrusion 137 may be inserted into the second fixing groove 133d and fixed to the inside of the case 15. Accordingly, the first fixing body 131a and the second fixing body 133a may be more stably fixed to the inside of the case 15.
  • FIGS. 1 to 7 are perspective views schematically illustrating a reinforcement part of a rechargeable battery according to a third exemplary embodiment of the present invention.
  • the same reference numerals as in FIGS. 1 to 7 refer to the same or similar members of the same or similar function. The detailed description of the same reference numerals will be omitted below.
  • the case 15 is provided with the first fixing body 31a and the second fixing body 33a connected to the connection body 230. It can be fixed inside the.
  • connection body 230 extends to have a long length along the bottom surface of the case 15, and the first fixing body 31a is connected at one end thereof and the second fixing body 33a is connected at the other end thereof.
  • connection body 230 an adhesive is applied between the connection body 230 and the bottom of the case 15, and when the connection body 230 is stably fixed to the inside of the case 15, the first fixing body 31a and the second fixing are fixed.
  • the body 33a can be effectively fixed. Accordingly, even when an external force is applied to the secondary battery, deformation does not occur and durability can be improved.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

A secondary battery is disclosed. The secondary battery comprises: an electrode assembly having a first electrode and a second electrode; a case containing the electrode assembly; a cap plate coupled to an opening of the case and having a terminal hole formed thereon; an electrode terminal installed on the cap plate and comprising a first electrode terminal and a second electrode terminal; and a lead tab comprising a first current collecting tab connecting the electrode assembly to the first electrode terminal and a second current collecting tab connecting the electrode assembly to the second electrode terminal, wherein a reinforcing part for fixing between the lead tab and the inside of the case is installed inside the case.

Description

이차전지Secondary battery
본 발명은 이차 전지에 관한 것이다.The present invention relates to a secondary battery.
일반적으로 이차 전지(rechargeable battery)는 충전이 불가능한 일차 전지와는 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.In general, 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.
대표적인 이차 전지에는 니켈 카드뮴(Ni-Cd)전지와 니켈 수소(Ni-MH)전지 및 리튬(Li) 전지와 리튬 이온(Li-ion) 이차 전지 등이 있다. 특히, 리튬 이온 이차 전지는 휴대용 전자 장비 전원으로 많이 사용되고 있는 니켈 카드뮴 전지나, 니켈 수소 전지보다 작동 전압이 약 3배나 높다. 또한, 단위 중량당 에너지 밀도가 높다는 측면에서 널리 사용되고 있다.Representative secondary batteries include nickel cadmium (Ni-Cd) batteries, nickel hydride (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) secondary batteries. In particular, the lithium ion secondary battery has an operating voltage about three times higher than that of a nickel cadmium battery or a nickel hydride battery which is widely used as a power source for portable electronic equipment. In addition, it is widely used in view of high energy density per unit weight.
이차 전지는 주로 양극 활물질로 리튬계 산화물, 음극 활물질로는 탄소재를 사용하고 있다. 일반적으로는, 전해질의 종류에 따라 액체 전해질 전지와, 고분자 전해질 전지로 분류되며, 액체 전해질을 사용하는 전지를 리튬 이온 전지라 하고, 고분자 전해질을 사용하는 전지를 리튬 폴리머 전지라고 한다. The secondary battery mainly uses a lithium oxide as a positive electrode active material and a carbon material as a negative electrode active material. In general, a battery is classified into a liquid electrolyte battery and a polymer electrolyte battery according to the type of electrolyte. A battery using a liquid electrolyte is called a lithium ion battery, and a battery using a polymer electrolyte is called a lithium polymer battery.
이러한 이차 전지는 측면부로부터 충격이 전달되는 경우, 이차 전지의 내부 방향으로 변형이 발생된다. When the secondary battery receives an impact from the side part, deformation occurs in the inner direction of the secondary battery.
따라서, 이차 전지의 측면부로부터 전달되는 충격에 의해 이차 전지 케이스가 함몰되는 등의 손상이 발생되는 경우, 이차 전지의 내부에서 전극 조립체가 손상되어, 폭발 등의 이상이 발생되는 문제점이 있다.Therefore, when damage occurs such as the secondary battery case is recessed by the impact transmitted from the side part of the secondary battery, the electrode assembly is damaged inside the secondary battery, and there is a problem that an abnormality such as an explosion occurs.
본 발명의 일 실시예에 따르면, 이차 전지의 측면부로부터 충격이 발생되는 경우, 충격에 의한 변형 등의 손상이 발생되는 것을 방지할 수 있는 이차 전지를 제공할 수 있다.According to one embodiment of the present invention, when an impact is generated from the side portion of the secondary battery, a secondary battery capable of preventing damage such as deformation caused by the impact may be provided.
본 발명의 일 실시예에 따른 이차 전지는, 제1 전극과 제2 전극을 구비하는 전극 조립체와, 전극 조립체를 내장하는 케이스와, 케이스의 개구에 결합되며 단자홀이 형성된 캡 플레이트와, 캡 플레이트에 설치되며 제1 전극 단자와 제2 전극 단자를 포함하는 전극 단자와, 전극 조립체를 제1 전극 단자에 연결하는 제1 집전 탭과 전극 조립체를 제2 전극 단자에 연결하는 제2 집전 탭을 포함하는 리드 탭을 포함한다. 여기서, 케이스의 내부에는 리드 탭과 케이스의 내부 사이를 고정하는 보강부가 설치될 수 있다.According to an embodiment of the present invention, a secondary battery includes an electrode assembly including a first electrode and a second electrode, a case in which the electrode assembly is embedded, a cap plate coupled to an opening of the case, and having a terminal hole, and a cap plate. An electrode terminal installed at the first electrode terminal, the electrode terminal including a first electrode terminal and a second electrode terminal, a first current collecting tab connecting the electrode assembly to the first electrode terminal, and a second current collecting tab connecting the electrode assembly to the second electrode terminal. It includes a lead tab. Here, a reinforcing part for fixing between the lead tab and the inside of the case may be installed inside the case.
보강부는, 케이스의 내부에서 제1 집전 탭과 케이스의 내부를 연결하는 제1 보강부재와, 케이스의 내부에서 제2 집전 탭과 케이스의 내부를 연결하는 제2 보강부재를 포함할 수 있다.The reinforcing part may include a first reinforcing member connecting the first current collecting tab to the inside of the case and a second reinforcing member connecting the second current collecting tab to the inside of the case.
제1 보강부재는, 케이스의 내부에 고정되는 제1 고정 바디와, 제1 고정 바디에 돌출되며 제1 집전 탭에 연결되는 제1 고정 돌부를 포함할 수 있다.The first reinforcing member may include a first fixing body fixed inside the case and a first fixing protrusion protruding from the first fixing body and connected to the first current collecting tab.
제1 고정 바디는 케이스의 내부에 접착체로 고정될 수 있다.The first fixing body may be fixed to the inside of the case by an adhesive.
제1 고정 돌부는 제1 집전 탭이 안착되는 제1 오목부가 형성될 수 있다.The first fixing protrusion may have a first recess in which the first current collecting tab is seated.
제2 보강부재는 케이스의 내부에 고정되는 제2 고정 바디와, 제2 고정 바디에 돌출되며 제2 집전 탭에 연결되는 제2 고정 돌부를 포함할 수 있다.The second reinforcing member may include a second fixing body fixed inside the case, and a second fixing protrusion protruding from the second fixing body and connected to the second current collecting tab.
제2 고정 바디는 케이스의 내부에 접착체로 고정될 수 있다.The second fixing body may be fixed to the inside of the case by an adhesive.
제2 고정 돌부는 제2 집전 탭이 안착되는 제2 오목부가 형성될 수 있다.The second fixing protrusion may have a second recess in which the second current collecting tab is seated.
제1 고정 바디와 제2 고정 바디는 연결 바디에 의해 케이스의 내부에 연결될 수 있다.The first fixing body and the second fixing body may be connected to the inside of the case by the connection body.
연결 바디는 케이스의 내부에 접착제에 의해 고정될 수 있다.The connecting body can be fixed by an adhesive inside the case.
케이스의 내부에는 제1 고정 돌기가 돌출될 수 있다.The first fixing protrusion may protrude inside the case.
제1 고정 바디에는 제1 고정 돌기가 삽입되는 제1 고정홈이 형성될 수 있다.A first fixing groove into which the first fixing protrusion is inserted may be formed in the first fixing body.
케이스의 내부에는 제2 고정 돌기가 돌출될 수 있다.The second fixing protrusion may protrude inside the case.
제2 고정 바디에는 제2 고정 돌기가 삽입되는 제2 고정홈이 형성될 수 있다. A second fixing groove into which the second fixing protrusion is inserted may be formed in the second fixing body.
본 발명의 일 실시예에 따른 이차 전지는, 이차 전지의 케이스의 내부에 부강부재가 설치되어, 케이스의 강도를 보강하면서 집전 탭의 돌출된 단부를 고정하는 것이 가능하다. 따라서, 케이스의 외부로부터 외력이 작용하는 경우에도 리드 탭과 전극 조립체가 변형 및 손상되는 것을 방지하여 이차 전지의 내구성의 향상이 가능하다.In the secondary battery according to the exemplary embodiment of the present invention, a steel member is installed inside the case of the secondary battery, and the protruding end of the current collecting tab may be fixed while reinforcing the strength of the case. Therefore, even when an external force is applied from the outside of the case, the lead tab and the electrode assembly are prevented from being deformed and damaged, thereby improving durability of the secondary battery.
도 1은 본 발명의 제1 실시예에 따른 이차 전지를 개략적으로 도시한 사시도이다.1 is a perspective view schematically illustrating a rechargeable battery according to a first exemplary embodiment of the present invention.
도 2는 도 1의 이차 전지의 Ⅱ-Ⅱ 선을 따라 잘라서 본 단면도이다.FIG. 2 is a cross-sectional view taken along line II-II of the rechargeable battery of FIG. 1. FIG.
도 3은 본 발명의 제1 실시예에 따른 보강부의 제1 보강부재를 개략적으로 도시한 사시도이다.3 is a perspective view schematically showing a first reinforcing member of the reinforcing portion according to the first embodiment of the present invention.
도 4는 본 발명의 제1 실시예에 따른 보강부의 제2 보강부재를 개략적으로 도시한 사시도이다.4 is a perspective view schematically showing a second reinforcing member of the reinforcing portion according to the first embodiment of the present invention.
도 5는 본 발명의 제2 실시예에 따른 이차 전지를 개략적으로 도시한 단면도이다.5 is a cross-sectional view schematically illustrating a rechargeable battery according to a second exemplary embodiment of the present invention.
도 6은 도 5의 보강부의 제1 보강부재를 개략적으로 도시한 사시도이다.FIG. 6 is a perspective view schematically illustrating a first reinforcing member of the reinforcing part of FIG. 5.
도 7은 도 5의 보강부의 제2 보강부재를 개략적으로 도시한 사시도이다.FIG. 7 is a perspective view schematically illustrating a second reinforcement member of the reinforcement part of FIG. 5.
도 8은 본 발명의 제3 실시예에 따른 이차 전지의 보강부를 개략적으로 도시한 사시도이다.8 is a perspective view schematically illustrating a reinforcement part of a rechargeable battery according to a third exemplary embodiment of the present invention.
이하, 첨부한 도면을 참조하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. 그러나 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다. 도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서는 동일한 참조부호를 붙였다.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. 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.
도 1은 본 발명의 제1 실시예에 따른 이차 전지를 개략적으로 도시한 사시도이고, 도 2는 도 1의 이차 전지의 Ⅱ-Ⅱ 선을 따라 잘라서 본 단면도이다.1 is a perspective view schematically illustrating a rechargeable battery according to a first exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of the rechargeable battery of FIG. 1.
도 1 및 도 2에 도시된 바와 같이, 본 발명의 제1 실시예에 따른 이차 전지(100)는, 제1 전극(11)과 제2 전극(12)을 구비하는 전극 조립체(10)와, 전극 조립체(10)를 내장하는 케이스(15)와, 케이스(15)의 개구에 결합되며 단자홀이 형성된 캡 플레이트(20)와, 캡 플레이트(20)에 설치되며 제1 전극 단자(21)와 제2 전극 단자(22)를 포함하는 전극 단자(21, 22)와, 전극 조립체(10)를 제1 전극 단자(21)에 연결하는 제1 집전 탭(51)과 전극 조립체(10)를 제2 전극 단자(22)에 연결하는 제2 집전 탭(52)을 포함하는 리드 탭(51, 52)을 포함한다. 여기서, 케이스(15)의 내부에는 리드 탭(51, 52)과 케이스(15)의 내부 사이를 고정하는 보강부(30)가 설치된다. 1 and 2, the secondary battery 100 according to the first embodiment of the present invention includes an electrode assembly 10 having a first electrode 11 and a second electrode 12, and A case 15 having the electrode assembly 10 embedded therein, a cap plate 20 coupled to the opening of the case 15 and having a terminal hole formed therein, and installed in the cap plate 20 and having a first electrode terminal 21. The electrode terminals 21 and 22 including the second electrode terminal 22, the first current collecting tab 51 and the electrode assembly 10 connecting the electrode assembly 10 to the first electrode terminal 21 may be removed. Lead tabs 51 and 52 including second current collecting tabs 52 connected to the two electrode terminals 22. Here, the reinforcement part 30 which fixes between the lead tabs 51 and 52 and the inside of the case 15 is provided in the case 15.
전극 조립체(10)는 절연체인 세퍼레이터(13)의 양면에 제1 전극(11, 이하, "음극"이라 한다)과 제2 전극(12, 이하, "양극"이라 한다)을 배치하고, 음극(11), 세퍼레이터(13) 및 양극(12)을 젤리롤 상태로 귄취하여 형성될 수 있다.The electrode assembly 10 arranges the first electrode 11 (hereinafter referred to as "cathode") and the second electrode 12 (hereinafter referred to as "anode") on both sides of the separator 13 as an insulator, and the cathode ( 11), the separator 13 and the positive electrode 12 may be formed by twisting in a jellyroll state.
음극(11) 및 양극(12)은, 각각 금속판의 집전체에 활물질을 도포한 코팅부(11a, 12a), 및 활물질을 도포하지 않아서 노출된 집전체로 형성되는 무지부(11b, 12b)를 포함한다.The negative electrode 11 and the positive electrode 12 each include the coating portions 11a and 12a in which the active material is applied to the current collector of the metal plate, and the plain portions 11b and 12b formed of the current collector exposed without applying the active material. Include.
음극(11)의 무지부(11b)는 권취되는 음극(11)을 따라 음극(11)의 한 쪽 단부에 형성된다. 양극(12)의 무지부(12b)는 권취되는 양극(12)을 따라 양극(12)의 한 쪽 단부에 형성된다. 따라서 무지부들(11b, 12b)은 전극 조립체(10)의 양단에 각각 배치된다.The uncoated portion 11b of the negative electrode 11 is formed at one end of the negative electrode 11 along the negative electrode 11 to be wound. The uncoated portion 12b of the anode 12 is formed at one end of the anode 12 along the anode 12 to be wound. Therefore, the uncoated portions 11b and 12b are disposed at both ends of the electrode assembly 10, respectively.
예를 들면, 케이스(15)는 내부에 전극 조립체(10)와 전해액을 수용하는 공간을 설정하도록 대략 직육면체로 이루어지며, 외부와 내부 공간을 연결하는 개구를 직육면체의 일면에 형성한다. 개구는 전극 조립체(10)를 케이스(15)의 내부로 삽입할 수 있게 한다.For example, the case 15 is formed of a substantially rectangular parallelepiped to set a space for accommodating the electrode assembly 10 and the electrolyte therein, and forms an opening connecting the external and internal spaces on one surface of the rectangular parallelepiped. The opening allows insertion of the electrode assembly 10 into the case 15.
캡 플레이트(20)는 케이스(15)의 개구에 설치됨으로써 케이스(15)를 밀폐한다. 예를 들면, 케이스(15)와 캡 플레이트(20)는 알루미늄으로 형성되어 서로 용접될 수 있다. The cap plate 20 is installed in the opening of the case 15 to seal the case 15. For example, the case 15 and the cap plate 20 may be made of aluminum and welded to each other.
또한, 캡 플레이트(20)는 전해액 주입구(29)와 벤트홀(24) 및 단자홀을 구비한다. 전해액 주입구(29)는 케이스(15)에 캡 플레이트(20)를 결합한 후, 케이스(15)의 내부로 전해액을 주입할 수 있게 한다. 전해액 주입 후, 전해액 주입구(29)는 밀봉 마개(27)로 밀봉된다. 벤트홀(24)은 이차 전지(100)의 내부 압력을 배출할 수 있도록 형성된다.In addition, the cap plate 20 includes an electrolyte injection hole 29, a vent hole 24, and a terminal hole. The electrolyte injection hole 29 couples the cap plate 20 to the case 15, and then injects the electrolyte into the case 15. After the electrolyte injection, the electrolyte injection opening 29 is sealed with a sealing stopper 27. The vent hole 24 is formed to discharge the internal pressure of the secondary battery 100.
한편, 전극 단자(21, 22)는 제1 전극 단자(21)와 제2 전극 단자(22)로 구성되는 것으로서, 캡 플레이트(20)에 설치되고 전극 조립체(10)에 전기적으로 연결된다. 예를 들면, 여기서, 제1 전극 단자(21)는 음극 단자 이고, 제2 전극 단자(22)는 양극 단자로 구성된다.Meanwhile, the electrode terminals 21 and 22 are configured of the first electrode terminal 21 and the second electrode terminal 22, and are installed in the cap plate 20 and electrically connected to the electrode assembly 10. For example, here, the first electrode terminal 21 is a negative electrode terminal, and the second electrode terminal 22 is composed of a positive electrode terminal.
음극 단자(21)는 전극 조립체(10)의 음극(11)에 전기적으로 연결되고, 양극 단자(22)는 캡 플레이트(20)에 용접 등에 의해 전기적으로 연결되어, 양극에 제2 집전 탭(52)을 통해 연결된다.The negative electrode terminal 21 is electrically connected to the negative electrode 11 of the electrode assembly 10, and the positive electrode terminal 22 is electrically connected to the cap plate 20 by welding or the like, so that the second current collecting tab 52 is connected to the positive electrode. Is connected via).
음극 단자(21)를 보다 구체적으로 설명하면, 음극 단자(21)는 단자홀을 통과하며 일단은 제1 집전 탭(51)에 연결되고 타단은 캡 플레이트(20)의 외측으로 돌출될 수 있다. In detail, the negative electrode terminal 21 may pass through the terminal hole, and one end may be connected to the first current collecting tab 51, and the other end may protrude out of the cap plate 20.
양극 단자(22)는 단자홀을 통과하여 일단은 제2 집전 탭(52)에 연결되고 타단은 캡 플레이트(20)의 외측으로 돌출될 수 있다.The positive terminal 22 may pass through the terminal hole, and one end may be connected to the second current collecting tab 52, and the other end may protrude to the outside of the cap plate 20.
한편, 케이스(15)의 내부에는 외부 충격에 의한 변형을 방지하는 보강부(30)가 설치된다.On the other hand, the inside of the case 15 is provided with a reinforcing portion 30 to prevent deformation due to external impact.
도 3은 본 발명의 제1 실시예에 따른 보강부의 제1 보강부재를 개략적으로 도시한 사시도이고, 도 4는 본 발명의 제1 실시예에 따른 보강부의 제2 보강부재를 개략적으로 도시한 사시도이다.3 is a perspective view schematically showing a first reinforcing member of the reinforcing part according to the first embodiment of the present invention, and FIG. 4 is a perspective view schematically showing a second reinforcing member of the reinforcing part according to the first embodiment of the present invention. to be.
도 3 및 도 4에 도시된 바와 같이, 보강부(30)는, 케이스(15)의 내부에서 제1 집전 탭(51)과 케이스(15)의 내부를 연결하는 제1 보강부재(31)와, 케이스(15)의 내부에서 제2 집전 탭(52)과 케이스(15)의 내부를 연결하는 제2 보강부재(33)를 포함할 수 있다. As shown in FIGS. 3 and 4, the reinforcement part 30 may include a first reinforcement member 31 connecting the first current collecting tab 51 and the inside of the case 15 to the inside of the case 15. The second reinforcing member 33 may connect the second current collecting tab 52 and the inside of the case 15 to the inside of the case 15.
제1 보강부재(31)는 케이스(15)의 저면에 위치된 상태로 고정되어 제1 집전 탭(51)을 지지하도록 설치될 수 있다. The first reinforcing member 31 may be fixed to be positioned on the bottom surface of the case 15 to support the first current collecting tab 51.
보다 구체적으로 설명하면, 제1 보강부재(31)는 케이스(15)의 내부에서 저면에 위치된 상태로 고정될 있다. 이러한 제1 보강부재(31)는, 케이스(15)의 내부에 고정되는 제1 고정 바디(31a)와, 제1 고정 바디(31a)에 돌출되며 제1 집전 탭(51)에 연결되는 제1 고정 돌부(31b)를 포함할 수 있다.In more detail, the first reinforcing member 31 may be fixed in a state located on a bottom surface of the case 15. The first reinforcement member 31 may include a first fixing body 31a fixed to the inside of the case 15 and a first protrusion protruding from the first fixing body 31a and connected to the first current collecting tab 51. It may include a fixing protrusion (31b).
제1 고정 바디(31a)는, 케이스(15)의 내부에서 저면에 고정되는 것으로 케이스(15)의 저면에 일측면이 접촉되고 다른 측면은 케이스(15)의 내벽면에 접촉된 상태로 고정될 수 있다. 즉, 제1 고정 바디(31a)는 케이스(15)의 내부 공간의 모서리 부분에 위치된 상태로 고정될 수 있다. The first fixing body 31a is fixed to the bottom of the case 15 so that one side of the first fixing body 31a is in contact with the bottom of the case 15 and the other side of the first fixing body 31a is in contact with the inner wall of the case 15. Can be. That is, the first fixing body 31a may be fixed in a state where it is located at a corner portion of the inner space of the case 15.
제1 고정 바디(31a)는 본 실시예에서 케이스(15)의 내부에서 접착제(32)에 의해 고정되는 것을 예시적으로 설명한다. 그러나 제1 고정 바디(31a)는 접착제로 고정되는 것으로 반드시 한정되는 것은 아니고 끼움 결합 또는 소정의 체결 부재(미도시) 등에 의해 고정되는 것도 가능하다. 이러한 제1 고정 바디(31a)에는 제1 고정 돌부(31b)가 돌출될 수 있다.Illustratively, the first fixing body 31a is fixed by the adhesive 32 in the case 15 in the present embodiment. However, the first fixing body 31a is not necessarily limited to being fixed with an adhesive, but may be fixed by fitting coupling or a predetermined fastening member (not shown). The first fixing protrusion 31b may protrude from the first fixing body 31a.
제1 고정 돌부(31b)는 제1 고정 바디(31a)에서 제1 집전 탭(51) 방향으로 돌출될 수 있다. 이와 같이, 제1 고정 돌부(31b)가 제1 고정 바디(31a)에 돌출되는 것은, 제1 고정 바디(31a)와 제1 집전 탭(51)을 연결하도록 하기 위한 것이다. 즉, 제1 집전 탭(51)은 제1 고정 돌부(31b)에 접촉된 상태로 지지될 수 있다.The first fixing protrusion 31b may protrude in the direction of the first current collecting tab 51 from the first fixing body 31a. In this way, the first fixing protrusion 31b protrudes from the first fixing body 31a so as to connect the first fixing body 31a and the first current collecting tab 51. That is, the first current collecting tab 51 may be supported in contact with the first fixing protrusion 31b.
제1 고정 돌부(31b)는 제1 고정 바디(31a)의 상측에서 케이스(15)의 내벽면과 일정 거리 이격된 상태로 돌출될 수 있다. 여기서, 제1 고정 돌부(31b)의 측면에는 제1 오목부(31c)가 형성될 수 있다.The first fixing protrusion 31b may protrude from an inner wall surface of the case 15 at a predetermined distance from an upper side of the first fixing body 31a. Here, the first concave portion 31c may be formed on the side surface of the first fixing protrusion 31b.
제1 오목부(31c)는 제1 고정 돌부(31b)에서 내벽면과 대향하는 측면에 형성될 수 있다. 제1 오목부(31c)는 제1 고정 돌부(31b)의 측면에서 라운드 형상으로 형성되어 제1 집전 탭(51)이 접촉된 상태로 위치될 수 있다. The first concave portion 31c may be formed on a side surface of the first fixing protrusion 31b that faces the inner wall surface. The first concave portion 31c may be formed in a round shape on the side surface of the first fixing protrusion 31b to be positioned in contact with the first current collecting tab 51.
즉, 제1 집전 탭(51)은 케이스(15)의 내벽면과 제1 고정 돌부(31b)의 사이에 위치하면서 제1 오목부(31c)에 접촉된 상태로 위치될 수 있다. 여기서, 제1 집전 탭(51)은 제1 오목부(31c)에 고정되는 것도 가능하고, 제1 오목부(31c)에 분리 가능한 상태로 접촉된 상태로 위치되는 것도 가능하다. That is, the first current collecting tab 51 may be positioned between the inner wall surface of the case 15 and the first fixing protrusion 31b and in contact with the first recess 31c. Here, the first current collecting tab 51 may be fixed to the first concave portion 31c, or may be positioned in contact with the first concave portion 31c in a detachable state.
이와 같이, 제1 집전 탭(51)이 제1 오목부(31c)에 접촉 지지된 상태에서 케이스(15)의 내벽면과 제1 고정 돌부(31b)의 사이에 위치되는 바, 케이스(15)의 외부로부터 외력이 작용하는 경우, 제1 집전 탭(51)은 제1 고정 돌부(31b)에 걸림 지지되어 외력에 의한 변형이 발생되지 않도록 할 수 있다. 따라서, 이차 전지(100)에 일측에서 눌림 또는 타격 등의 외력이 작용하여도 제1 집전 탭(51)은 변형이 발생되지 않아 내구성의 향상이 가능하다.As such, the case 15 is located between the inner wall surface of the case 15 and the first fixing protrusion 31b while the first current collecting tab 51 is in contact with and supported by the first recess 31c. When an external force acts from the outside of the first collector tab 51, the first current collecting tab 51 may be supported by the first fixing protrusion 31b to prevent deformation caused by the external force. Therefore, even when an external force such as pressing or hitting is applied to one side of the secondary battery 100, the first current collecting tab 51 is not deformed, thereby improving durability.
도 4에 도시된 바와 같이, 제2 보강부재(33)는 케이스(15)의 저면에 위치된 상태로 고정되어 제2 집전 탭(52)을 지지하도록 설치될 수 있다. As shown in FIG. 4, the second reinforcing member 33 may be fixed to be positioned on the bottom surface of the case 15 to support the second current collecting tab 52.
보다 구체적으로 설명하면, 제2 보강부재(33)는 케이스(15)의 내부 저면에서 제1 보강부재(31)로부터 이격된 상태로 고정될 있다. 이러한 제2 보강부재(33)는, 케이스(15)의 내부에 고정되는 제2 고정 바디(33a)와, 제2 고정 바디(33a)에 돌출되며 제2 집전 탭(52)에 연결되는 제2 고정 돌부(33b)를 포함할 수 있다.More specifically, the second reinforcing member 33 may be fixed in a state spaced apart from the first reinforcing member 31 on the inner bottom surface of the case 15. The second reinforcing member 33 has a second fixing body 33a fixed to the inside of the case 15 and a second projecting portion protruding from the second fixing body 33a and connected to the second current collecting tab 52. It may include a fixing protrusion (33b).
제2 고정 바디(33a)는, 케이스(15)의 내부에서 저면에 고정되는 것으로 케이스(15)의 저면에 일측면이 접촉되고 다른 측면은 케이스(15)의 내벽면에 접촉된 상태로 고정될 수 있다. 즉, 제2 고정 바디(33a)는 케이스(15)의 내부 공간에서 제1 고정 바디(31a)로부터 이격된 상태로 케이스(15)의 내부의 다른 모서리 부분에 위치된 상태로 고정될 수 있다. The second fixing body 33a is fixed to the bottom surface of the case 15 so that one side surface is in contact with the bottom surface of the case 15 and the other side surface is fixed in contact with the inner wall surface of the case 15. Can be. That is, the second fixing body 33a may be fixed in a state in which the second fixing body 33a is located at another corner portion of the inside of the case 15 while being spaced apart from the first fixing body 31a in the inner space of the case 15.
제2 고정 바디(33a)는 본 실시예에서 케이스(15)의 내부에서 접착제(32)에 의해 고정되는 것을 예시적으로 설명한다. 그러나 제2 고정 바디(33a)는 접착제로 고정되는 것으로 반드시 한정되는 것은 아니고 끼움 결합 또는 소정의 체결 부재(미도시) 등에 의해 고정되는 것도 가능하다. 이러한 제2 고정 바디(33a)에는 제2 고정 돌부(33b)가 돌출될 수 있다.By way of example, the second fixing body 33a is fixed by the adhesive 32 inside the case 15. However, the second fixing body 33a is not necessarily limited to being fixed with an adhesive, but may be fixed by fitting coupling or a predetermined fastening member (not shown). The second fixing protrusion 33b may protrude from the second fixing body 33a.
제2 고정 돌부(33b)는 제2 고정 바디(33a)에서 제2 집전 탭(52) 방향으로 돌출될 수 있다. 이와 같이, 제2 고정 돌부(33b)가 제2 고정 바디(33a)에 돌출되는 것은, 제2 고정 바디(33a)와 제2 집전 탭(52)을 연결하도록 하기 위한 것이다. 즉, 제2 집전 탭(52)은 제2 고정 돌부(33b)에 접촉된 상태로 지지될 수 있다.The second fixing protrusion 33b may protrude in the direction of the second current collecting tab 52 from the second fixing body 33a. As described above, the second fixing protrusion 33b protrudes from the second fixing body 33a so as to connect the second fixing body 33a and the second current collecting tab 52. That is, the second current collecting tab 52 may be supported in contact with the second fixing protrusion 33b.
제2 고정 돌부(33b)는 제2 고정 바디(33a)의 상측에서 케이스(15)의 내벽면과 일정 거리 이격된 상태로 돌출될 수 있다. 여기서, 제2 고정 돌부(33b)의 측면에는 제2 오목부(33c)가 형성될 수 있다.The second fixing protrusion 33b may protrude in a state spaced apart from the inner wall surface of the case 15 by a predetermined distance from the upper side of the second fixing body 33a. Here, the second concave portion 33c may be formed on the side surface of the second fixing protrusion 33b.
제2 오목부(33c)는 제2 고정 돌부(33b)에서 내벽면과 대향하는 측면에 형성될 수 있다. 제2 오목부(33c)는 제2 고정 돌부(33b)의 측면에서 라운드 형상으로 형성되어 제2 집전 탭(52)이 접촉된 상태로 위치될 수 있다. The second concave portion 33c may be formed on a side surface of the second fixing protrusion 33b that faces the inner wall surface. The second concave portion 33c may be formed in a round shape at the side of the second fixing protrusion 33b to be positioned in contact with the second current collecting tab 52.
즉, 제2 집전 탭(52)은 케이스(15)의 내벽면과 제2 고정 돌부(33b)의 사이에 위치하면서 제2 오목부(33c)에 접촉된 상태로 위치될 수 있다. 여기서, 제2 집전 탭(52)은 제2 오목부(33c)에 고정되는 것도 가능하고, 제2 오목부(33c)에 분리 가능한 상태로 접촉된 상태로 위치되는 것도 가능하다. That is, the second current collecting tab 52 may be positioned between the inner wall surface of the case 15 and the second fixing protrusion 33b while being in contact with the second recess 33c. Here, the second current collecting tab 52 may be fixed to the second recess 33c or may be positioned in contact with the second recess 33c in a detachable state.
이와 같이, 제2 집전 탭(52)이 제2 오목부(33c)에 접촉 지지된 상태에서 케이스(15)의 내벽면과 제2 고정 돌부(33b)의 사이에 위치되는 바, 케이스(15)의 외부로부터 외력이 작용하는 경우, 제2 집전 탭(52)은 제2 고정 돌부(33b)에 걸림 지지되어 외력에 의한 변형이 발생되지 않도록 할 수 있다. 따라서, 이차 전지(100)의 타측에서 눌림 또는 타격 등의 외력이 작용하여도 제2 집전 탭(52)은 변형이 발생되지 않아 내구성의 향상이 가능하다.As such, the case 15 is located between the inner wall surface of the case 15 and the second fixing protrusion 33b while the second current collecting tab 52 is in contact with and supported by the second recess 33c. When an external force acts from the outside of the second collector tab 52, the second current collecting tab 52 may be caught by the second fixing protrusion 33b to prevent deformation due to the external force. Therefore, even when an external force such as pressing or hitting is applied from the other side of the secondary battery 100, the second current collecting tab 52 is not deformed, thereby improving durability.
전술한 바와 같이, 케이스(15)의 내부에는 제1 보강부재(31)와 제2 보강부재(33)가 설치되는 바 케이스(15)의 강도를 보강하면서, 제1 집전 탭(51)과 제2 집전 탭(52)의 돌출된 단부를 고정하는 것이 가능하다. 따라서, 케이스(15)의 외부로부터 외력이 작용하는 경우에도 리드 탭(51, 52)과 전극 조립체(10)가 변형 및 손상되는 것을 방지하여 이차 전지(100)의 내구성의 향상이 가능하다. As described above, the first current collecting tab 51 and the first collecting member 51 and the first reinforcing member 31 and the second reinforcing member 33 are installed inside the case 15 while reinforcing the strength of the case 15. It is possible to fix the protruding end of the two current collecting tabs 52. Therefore, even when an external force is applied from the outside of the case 15, the lead tabs 51 and 52 and the electrode assembly 10 may be prevented from being deformed and damaged, thereby improving durability of the secondary battery 100.
도 5는 본 발명의 제2 실시예에 따른 이차 전지를 개략적으로 도시한 단면도이고, 도 6은 도 5의 보강부의 제1 보강부재를 개략적으로 도시한 사시도이며, 도 7은 도 5의 보강부의 제2 보강부재를 개략적으로 도시한 사시도이다. 도 1 내지 도 4와 동일 참조 번호는 동일 또는 유사 기능의 동일 또는 유사 부재를 말한다. 이하에서 동일 참조 번호에 대해서는 그 자세한 설명을 생략한다. 5 is a cross-sectional view schematically illustrating a rechargeable battery according to a second exemplary embodiment of the present invention, FIG. 6 is a perspective view schematically illustrating a first reinforcing member of the reinforcing part of FIG. 5, and FIG. 7 is a reinforcing part of FIG. 5. A perspective view schematically showing a second reinforcing member. The same reference numerals as FIGS. 1 to 4 refer to the same or similar members of the same or similar function. The detailed description of the same reference numerals will be omitted below.
도 5 내지 도 7에 도시된 바와 같이, 본 발명의 제2 실시예에 따른 이차 전지(200)는, 제1 고정 바디(131a)에 제1 고정홈(131d)이 형성되고, 제2 고정 바디(133a)에 제2 고정홈(133d)이 형성된다. 5 to 7, in the rechargeable battery 200 according to the second embodiment of the present invention, a first fixing groove 131d is formed in the first fixing body 131a, and the second fixing body is formed. A second fixing groove 133d is formed in 133a.
그리고, 케이스(15)의 내부에는 제1 고정 바디(31a)의 설치 위치의 내부에 제1 고정 돌기(135)가 돌출된다. 아울러, 케이스(15)의 내부에는 제2 고정 바디(133a)의 설치 위치의 내부에 제2 고정 돌기(137)가 돌출된다. In addition, the first fixing protrusion 135 protrudes inside the installation position of the first fixing body 31a in the case 15. In addition, the second fixing protrusion 137 protrudes inside the installation position of the second fixing body 133a in the case 15.
이에 따라, 제1 고정 바디(131a)는 제1 고정 돌기(135)가 제1 고정홈(131d)에 삽입되어 케이스(15)의 내부에 고정되고, 제2 고정 바디(133a)는 제2 고정 돌기(137)가 제2 고정홈(133d)에 삽입되어 케이스(15)의 내부에 고정될 수 있다. 이에 따라 제1 고정 바디(131a) 및 제2 고정 바디(133a)는 케이스(15)의 내부에 더욱 안정적으로 고정되는 것이 가능하다.Accordingly, the first fixing body 131a is inserted into the first fixing groove 131d to be fixed to the inside of the case 15, and the second fixing body 133a is fixed to the second. The protrusion 137 may be inserted into the second fixing groove 133d and fixed to the inside of the case 15. Accordingly, the first fixing body 131a and the second fixing body 133a may be more stably fixed to the inside of the case 15.
도 8은 본 발명의 제3 실시예에 따른 이차 전지의 보강부를 개략적으로 도시한 사시도이다. 도 1 내지 도 7과 동일 참조 번호는 동일 또는 유사 기능의 동일 또는 유사 부재를 말한다. 이하에서 동일 참조 번호에 대해서는 그 자세한 설명을 생략한다.  8 is a perspective view schematically illustrating a reinforcement part of a rechargeable battery according to a third exemplary embodiment of the present invention. The same reference numerals as in FIGS. 1 to 7 refer to the same or similar members of the same or similar function. The detailed description of the same reference numerals will be omitted below.
도 8에 도시된 바와 같이, 본 발명의 제3 실시예에 따른 이차 전지는, 제1 고정 바디(31a)와 제2 고정 바디(33a)가 연결 바디(230)에 연결된 상태로 케이스(15)의 내부에 고정될 수 있다. As shown in FIG. 8, in the rechargeable battery according to the third exemplary embodiment, the case 15 is provided with the first fixing body 31a and the second fixing body 33a connected to the connection body 230. It can be fixed inside the.
연결 바디(230)는 케이스(15)의 저면을 따라 긴 길이를 갖도록 연장되는 것으로, 일단에는 제1 고정 바디(31a)가 연결되고 타단에는 제2 고정 바디(33a)가 연결된다. The connection body 230 extends to have a long length along the bottom surface of the case 15, and the first fixing body 31a is connected at one end thereof and the second fixing body 33a is connected at the other end thereof.
여기서, 연결 바디(230)와 케이스(15)의 저면 사이에는 접착제가 도포되는 바, 연결 바디(230)를 케이스(15)의 내부에 안정적으로 고정하면 제1 고정 바디(31a)와 제2 고정 바디(33a)를 효과적으로 고정할 수 있다. 이에 따라 이차 전지에 외력이 가해져도 변형이 발생되지 않아 내구성의 향상이 가능하다. Here, an adhesive is applied between the connection body 230 and the bottom of the case 15, and when the connection body 230 is stably fixed to the inside of the case 15, the first fixing body 31a and the second fixing are fixed. The body 33a can be effectively fixed. Accordingly, even when an external force is applied to the secondary battery, deformation does not occur and durability can be improved.
이상을 통해 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것이 아니고 청구범위와 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 range of.
(부호의 설명)(Explanation of the sign)
10...전극 조립체 11...제1 전극10 ... electrode assembly 11 ... first electrode
12...제2 전극 13...세퍼레이터12 ... second electrode 13 ... separator
15...케이스 20...캡 플레이트15 Case 20 Cap Plate
21...제1 전극 단자 22...제2 전극 단자21 ... first electrode terminal 22 ... second electrode terminal
30...보강부 31...제1 보강부재30 Reinforcement part 1st reinforcing member
31a..제1 고정 바디 31b..제1 고정 돌부31a.First fixing body 31b.First fixing protrusion
31c..제1 오목부 32...접착제31c .. 1st recessed part 32 ... adhesive
33a..제2 고정 바디 33b..제2 고정 돌부 33a .. 2nd fixing body 33b .. 2nd fixing protrusion
33c..제2 오목부 131d..제1 고정홈33c .. 2nd recess 131d .. 1st fixing groove
133d..제2 고정홈 135..제1 고정 돌기133d .. 2nd fixing groove 135 .. 1st fixing protrusion
137..제2 고정 돌기 230..연결 바디137. 2nd fixing projection 230. Connection body

Claims (12)

  1. 제1 전극과 제2 전극을 구비하는 전극 조립체;An electrode assembly having a first electrode and a second electrode;
    상기 전극 조립체를 내장하는 케이스;A case housing the electrode assembly;
    상기 케이스의 개구에 결합되며 단자홀이 형성된 캡 플레이트;A cap plate coupled to the opening of the case and having a terminal hole formed therein;
    상기 캡 플레이트에 설치되며, 제1 전극 단자와 제2 전극 단자를 포함하는 전극 단자; 및An electrode terminal installed on the cap plate and including a first electrode terminal and a second electrode terminal; And
    상기 전극 조립체를 상기 제1 전극 단자에 연결하는 제1 집전 탭과 상기 전극 조립체를 상기 제2 전극 단자에 연결하는 제2 집전 탭을 포함하는 리드 탭을 포함하고, A lead tab including a first current collecting tab connecting the electrode assembly to the first electrode terminal and a second current collecting tab connecting the electrode assembly to the second electrode terminal,
    상기 케이스의 내부에는 상기 리드 탭과 상기 케이스의 내부 사이를 고정하는 보강부가 설치되는 이차 전지.The secondary battery has a reinforcing part for fixing between the lead tab and the inside of the case inside the case.
  2. 제1항에 있어서,The method of claim 1,
    상기 보강부는, The reinforcement part,
    상기 케이스의 내부에서 상기 제1 집전 탭과 상기 케이스의 내부를 연결하는 제1 보강부재; 및A first reinforcing member connecting the first current collecting tab and the inside of the case to the inside of the case; And
    상기 케이스의 내부에서 상기 제2 집전 탭과 상기 케이스의 내부를 연결하는 제2 보강부재를 포함하는 이차 전지.And a second reinforcing member connecting the second current collecting tab and the inside of the case to the inside of the case.
  3. 제2항에 있어서,The method of claim 2,
    상기 제1 보강부재는,The first reinforcing member,
    상기 케이스의 내부에 고정되는 제1 고정 바디; 및A first fixing body fixed inside the case; And
    상기 제1 고정 바디에 돌출되며 상기 제1 집전 탭에 연결되는 제1 고정 돌부를 포함하는 이차 전지.The secondary battery includes a first fixing protrusion protruding from the first fixing body and connected to the first current collecting tab.
  4. 제3항에 있어서,The method of claim 3,
    상기 제1 고정 바디는 상기 케이스의 내부에 접착체로 고정되는 이차 전지.The first fixing body is a secondary battery is fixed to the inside of the case with an adhesive.
  5. 제3항에 있어서,The method of claim 3,
    상기 제1 고정 돌부는 상기 제1 집전 탭이 안착되는 제1 오목부가 형성되는 이차 전지.The first fixing protrusion is a secondary battery in which a first recess is formed on which the first current collecting tab is seated.
  6. 제2항에 있어서,The method of claim 2,
    상기 제2 보강부재는The second reinforcing member
    상기 케이스의 내부에 고정되는 제2 고정 바디; 및A second fixing body fixed inside the case; And
    상기 제2 고정 바디에 돌출되며 상기 제2 집전 탭에 연결되는 제2 고정 돌부를 포함하는 이차 전지.A secondary battery protruding from the second fixing body and including a second fixing protrusion connected to the second current collecting tab.
  7. 제6항에 있어서,The method of claim 6,
    상기 제2 고정 바디는 상기 케이스의 내부에 접착체로 고정되는 이차 전지.The second fixing body is a secondary battery is fixed to the inside of the case with an adhesive.
  8. 제7항에 있어서,The method of claim 7, wherein
    상기 제2 고정 돌부는 상기 제2 집전 탭이 안착되는 제2 오목부가 형성되는 이차 전지.The second fixing protrusion is a secondary battery having a second recessed portion in which the second current collecting tab is seated.
  9. 제3항에 있어서,The method of claim 3,
    상기 제1 고정 바디와 상기 제2 고정 바디는 연결 바디에 의해 상기 케이스의 내부에 연결되는 이차 전지.The first and second fixing bodies are connected to the inside of the case by a connecting body.
  10. 제9항에 있어서,The method of claim 9,
    상기 연결 바디는 상기 케이스의 내부에 접착제에 의해 고정되는 이차 전지.The connection body is a secondary battery is fixed by the adhesive inside the case.
  11. 제3항에 있어서,The method of claim 3,
    상기 케이스의 내부에는 제1 고정 돌기가 돌출되고, A first fixing protrusion protrudes inside the case,
    상기 제1 고정 바디에는 상기 제1 고정 돌기가 삽입되는 제1 고정홈이 형성되는 이차 전지.Secondary battery is formed in the first fixing body has a first fixing groove into which the first fixing projection is inserted.
  12. 제3항에 있어서,The method of claim 3,
    상기 케이스의 내부에는 제2 고정 돌기가 돌출되고, A second fixing protrusion protrudes inside the case,
    상기 제2 고정 바디에는 상기 제2 고정 돌기가 삽입되는 제2 고정홈이 형성되는 이차 전지.The secondary battery has a second fixing groove is formed in the second fixing body is inserted into the second fixing protrusion.
PCT/KR2016/009923 2016-04-11 2016-09-05 Secondary battery WO2017179777A1 (en)

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KR10-2016-0044379 2016-04-11

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060010482A (en) * 2004-07-28 2006-02-02 삼성에스디아이 주식회사 Secondary battery
KR20060022355A (en) * 2004-09-07 2006-03-10 삼성에스디아이 주식회사 Secondary battery and electrodes assembly using the same
KR101147174B1 (en) * 2010-11-25 2012-05-25 에스비리모티브 주식회사 Rechargeable battery
KR101201745B1 (en) * 2009-08-17 2012-11-15 에스비리모티브 주식회사 Rechargeable battery
KR20140147660A (en) * 2013-06-19 2014-12-30 삼성에스디아이 주식회사 Rechargeable battery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060010482A (en) * 2004-07-28 2006-02-02 삼성에스디아이 주식회사 Secondary battery
KR20060022355A (en) * 2004-09-07 2006-03-10 삼성에스디아이 주식회사 Secondary battery and electrodes assembly using the same
KR101201745B1 (en) * 2009-08-17 2012-11-15 에스비리모티브 주식회사 Rechargeable battery
KR101147174B1 (en) * 2010-11-25 2012-05-25 에스비리모티브 주식회사 Rechargeable battery
KR20140147660A (en) * 2013-06-19 2014-12-30 삼성에스디아이 주식회사 Rechargeable battery

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