WO2018052209A1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
WO2018052209A1
WO2018052209A1 PCT/KR2017/009662 KR2017009662W WO2018052209A1 WO 2018052209 A1 WO2018052209 A1 WO 2018052209A1 KR 2017009662 W KR2017009662 W KR 2017009662W WO 2018052209 A1 WO2018052209 A1 WO 2018052209A1
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WIPO (PCT)
Prior art keywords
vent
electrode
spark
hole
secondary battery
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PCT/KR2017/009662
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French (fr)
Korean (ko)
Inventor
권민형
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삼성에스디아이 주식회사
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Publication of WO2018052209A1 publication Critical patent/WO2018052209A1/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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/383—Flame arresting or ignition-preventing means
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • 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
    • H01M50/571—Methods or arrangements for affording protection against corrosion; Selection of materials therefor
    • 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
    • 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
    • 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 disclosure relates to a secondary battery in which spark is not discharged to the outside of the vent hole.
  • 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 vent part is formed in the cap plate, and when the pressure inside the cell rises, the vent part breaks frequently and sparks occur outside the cap plate.
  • One aspect of the present invention is to provide a secondary battery that prevents the spark is released to the outside to improve the durability and the occurrence of safety accidents.
  • 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 coupled to an opening of the case and having a first vent formed inside the vent hole.
  • An electrode terminal provided on the plate, the cap plate, the first electrode terminal including the first electrode terminal and the second electrode terminal, the first current collecting tab connecting the electrode assembly to the first electrode terminal, and a second electrode terminal connecting the second electrode terminal.
  • the lead tab may include a second collecting tab, and the bottom surface may be spaced apart from the first vent and the side surface may be spaced apart from the inner wall surface of the vent hole, and the second vent may include a plurality of spark holes.
  • the second vent includes a seating part seated in the vent hole, a side part bent from the seating part, extending into the vent hole and having an inlet space formed therein and a spark hole formed in an inner wall surface of the inlet space, and extending in the side part. And a bottom portion facing away from the first vent.
  • Spark holes may be formed in plurality in a state facing each other at the side facing each other.
  • the spark hole may be formed in plural along the circumference of the side part.
  • the bottom portion may be provided with a guide portion for guiding the spark emitted from the first vent to the spark hole portion.
  • the guide part may be an inclined surface formed to be inclined in the lateral direction from the bottom of the second vent.
  • the guide part may be a guide groove formed in the side direction at the bottom of the second vent.
  • a plurality of guide grooves may be formed radially with respect to the center of the bottom portion.
  • the spark generated in the first vent due to the increase in the internal pressure passes through the second vent and the sparks cancel each other's contact with each other, thereby effectively preventing sparks from occurring outside of the secondary battery. Can be.
  • 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 illustrating an essential part of a state in which a second vent is installed in a vent hole of the rechargeable battery of FIG. 1.
  • FIG. 4 is a cross-sectional perspective view illustrating main parts schematically illustrating a state in which the first vent and the second vent are cut along the line IV-IV of the rechargeable battery of FIG. 3.
  • FIG. 5 is a cross-sectional view illustrating main parts of a state in which the first vent and the second vent are cut along the line VV of the rechargeable battery of FIG. 3.
  • FIG. 6 is a cross-sectional view illustrating main parts of a state in which a first vent and a second vent are installed according to a second exemplary embodiment of the present invention.
  • FIG. 7 is a bottom perspective view schematically illustrating a main part in which a second vent according to a third exemplary embodiment of the present invention is installed.
  • 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 therein; a cap plate 20 coupled to the opening of the case 15 and having a first vent 41 formed inside the vent hole 10a; and a cap plate 20 And a first current collector for connecting the electrode assembly 10 to the first electrode terminal 21 and the electrode terminals 21 and 22 installed at the first electrode terminal 21 and the second electrode terminal 22.
  • Lead tabs 51 and 52 including a second current collecting tab 52 connecting the tab 51 and the electrode assembly 10 to the second electrode terminal 22.
  • the electrode assembly 10 has a first electrode (hereinafter referred to as "cathode”) 11 and a second electrode (hereinafter referred to as “anode”) 12 disposed on both sides of the separator 13 as an insulator,
  • the negative electrode 11, the separator 13, and the positive electrode 12 may be formed by drawing a jelly roll.
  • 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 20a, 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 first vent 41 is formed in the vent hole 20a 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.
  • FIG. 3 is a perspective view schematically illustrating a state in which a second vent is installed in a vent hole of the secondary battery of FIG. 1, and FIG. 4 is a view of the first vent and the second cut along the line IV-IV of the secondary battery of FIG. 3.
  • FIG. 5 is a cross-sectional perspective view illustrating main parts in a vent state, and FIG. 5 is a cross-sectional view of main parts in a state in which the first vent and the second vent of the secondary battery of FIG. 3 are cut out.
  • the vent hole 10a is provided with a second vent 40 above the first vent 41.
  • the second vent 40 allows the spark 41a generated from the first vent 41 to be discharged while forming a curved path, so that the spark does not diverge to the outside of the cap plate 20.
  • the second vent 40 extends into the vent hole 10a in a state bent from the seating portion 42 and the seating portion 42 seated in the vent hole 10a, and the spark hole 44a is formed.
  • the formed side portion 44 may include a bottom portion 46 extending to the side portion 44 and facing away from the first vent 41.
  • the seating part 42 is installed in a state of being seated at an opened position of the vent hole 10a and may be fixed to the cap plate 20 of the portion where the vent hole 10a is formed.
  • the mounting portion 42 may be fixed in a state of being seated on the stepped portion formed in the open edge portion of the vent hole 10a.
  • the seating portion 42 may have a side portion 44 extending in the inner direction of the vent hole 10a.
  • the side portion 44 is connected to the seating portion 42 and the other side extends in the inner direction of the vent hole 10a.
  • the side portion 44 may extend in the direction of the first vent 41 while being spaced apart from the inner wall surface of the vent hole 10a.
  • the side 44 is spaced apart from the inner wall surface of the vent hole 10a so that the spark 41a generated in the first vent 41 is a portion between the side portion 44 and the inner wall surface of the vent hole 10a. It is intended to be introduced into.
  • the side part 44 is formed with a plurality of spark holes 44a through which the sparks 41a generated by breaking of the first vent 41 are discharged.
  • the inlet space is formed in the side portion 44, and the spark hole 44a may be formed to penetrate the inner wall surface of the inlet space.
  • the spark hole 44a is formed in the side portion 44 so that the spark 41a generated in the first vent 41 is canceled while passing through the spark hole 44a to the outside of the cap plate 20. This is to prevent the spark 41a from being discharged. This will be described in detail below.
  • the spark holes 44a may be formed on both sides of the side wall 44 facing each other on the inner wall surface of the inlet space.
  • the spark hole 44a may be formed by forming a plurality of rows and columns on opposite sides of the side portion 44. Although the spark hole 44a is exemplarily described as being opened in a cylindrical shape, the spark hole 44a is not necessarily limited thereto and may be opened in a polygonal shape.
  • the spark hole 44a penetrates the inner wall surface of the inlet space so that the spark generated in the first vent 41 passes through the opposing spark hole 44a, respectively, in the inside of the inlet space. It is possible to offset by contact. Accordingly, the spark can be effectively attenuated or extinguished inside the inlet space without being discharged to the outside of the second vent 40.
  • spark hole 44a is exemplarily described to be formed on each side facing each other in the present embodiment, the present invention is not necessarily limited thereto and may be formed along the circumference of the side of the second vent 40.
  • the bottom portion 46 may be positioned inside the vent hole 10a while being spaced apart from the first vent 41. Therefore, the spark emitted from the first vent 41 may move to the space between the side portion 44 and the inner wall surface of the vent hole 10a in the state of first contact with the bottom portion 46.
  • bottom portion 46 is exemplarily described as being formed as a flat surface in this embodiment, it is not necessarily limited thereto, and a part or the whole of the surface is induced to induce the movement of the spark generated from the first vent 41. It is also possible to deform to a certain shape.
  • the spark discharged from the first vent 41 is moved while the path is changed from the bottom of the second vent 40 to the side 44, and the second vent (a) is formed through the spark hole 44a formed in the side 44. 40 can be moved into the interior of the inlet space.
  • the spark 41a generated in the first vent 41 is discharged into the inlet space through the spark hole 44a of the second vent 40 through the curved path. It is possible to reduce the risk of explosion safety accidents by contacting each other and an effective offset action.
  • FIGS. 1 to 5 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 guide part 147 is formed in the second vent 40 to guide the movement of the spark emitted from the first vent 41. do.
  • the guide part 147 may be applied to an inclined surface formed on the bottom surface 146 of the second vent 40. Therefore, the spark emitted from the first vent 41 may be guided to the spark hole 44a formed in the side portion 44 along the inclined surface of the guide part 147 to be effectively moved.
  • FIG. 7 is a bottom perspective view schematically illustrating a main part in which a second vent according to a third exemplary embodiment of the present invention is installed.
  • the same reference numerals as FIGS. 1 to 6 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 guide part 247 of the rechargeable battery according to the second exemplary embodiment of the present invention may be formed as a guide groove 247 on the bottom 246 of the second vent 40.
  • the guide groove and the guide portion use the same reference numerals.
  • a plurality of guide grooves 247 may be radially formed in the edge direction from the center of the bottom portion 46 of the second vent 40. Therefore, the spark emitted from the first vent 41 may be effectively guided and moved in the direction of the spark hole 44a by the guide groove 247.

Abstract

A secondary battery is disclosed. A secondary battery according to one embodiment of the present invention comprises: an electrode assembly having a first electrode and a second electrode; a case in which the electrode assembly is embedded; a cap plate coupled to the opening of the case, and having a first vent formed inside a vent hole; an electrode terminal provided in the cap plate, and including a first electrode terminal and a second electrode terminal; a lead tab including a first current collector tab for connecting the electrode assembly to the first electrode terminal, and a second current collector tab for connecting the electrode assembly to the second electrode terminal; and a second vent, which has a bottom surface spaced apart from the first vent, a side surface spaced apart from an inner wall surface of the vent hole while covering the vent hole, and a plurality of spark holes.

Description

이차 전지Secondary battery
본 기재는 스파크가 벤트홀의 외부로 배출되지 않는 이차 전지에 관한 것이다.The present disclosure relates to a secondary battery in which spark is not discharged to the outside of the vent hole.
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 캡 플레이트에 벤트부가 형성되며, 셀 내부 압력이 상승하는 경우 벤트부가 파단되어 캡 플레이트의 외측으로 스파크가 발생되는 경우가 빈번하다. In the secondary battery, a vent part is formed in the cap plate, and when the pressure inside the cell rises, the vent part breaks frequently and sparks occur outside the cap plate.
따라서, 이차 전지의 외부로 발생된 스파크에 의해 화재 등의 안전 사고가 발생될 수 있는 문제점이 있다.Therefore, there is a problem that a safety accident such as a fire may be generated by the spark generated outside of the secondary battery.
본 발명의 일 측면은 스파크가 외부로 방출되지 않도록 하여 내구성 향상 및 안전 사고의 발생을 방지하는 이차 전지를 제공하고자 한다.One aspect of the present invention is to provide a secondary battery that prevents the spark is released to the outside to improve the durability and the occurrence of safety accidents.
본 발명의 일 실시예에 따른 이차 전지는, 제1 전극과 제2 전극을 구비하는 전극 조립체와, 전극 조립체를 내장하는 케이스와, 케이스의 개구에 결합되며 벤트홀의 내부에 제1 벤트가 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 포함하고, 벤트홀을 덮으면서 저면은 제1 벤트와 이격되고 측면은 벤트홀의 내벽면과 이격되며 복수개의 스파크 홀이 형성된 제2 벤트를 포함한다.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 coupled to an opening of the case and having a first vent formed inside the vent hole. An electrode terminal provided on the plate, the cap plate, the first electrode terminal including the first electrode terminal and the second electrode terminal, the first current collecting tab connecting the electrode assembly to the first electrode terminal, and a second electrode terminal connecting the second electrode terminal. The lead tab may include a second collecting tab, and the bottom surface may be spaced apart from the first vent and the side surface may be spaced apart from the inner wall surface of the vent hole, and the second vent may include a plurality of spark holes.
제2 벤트는, 벤트홀에 안착되는 안착부와, 안착부로부터 절곡된 상태로 벤트홀의 내부로 연장되며 인입 공간이 내부에 형성되고 인입 공간의 내벽면으로 스파크 홀이 형성된 측부와, 측부에 연장되고 제1 벤트로부터 이격된 상태로 대면하는 저면부를 포함할 수 있다.The second vent includes a seating part seated in the vent hole, a side part bent from the seating part, extending into the vent hole and having an inlet space formed therein and a spark hole formed in an inner wall surface of the inlet space, and extending in the side part. And a bottom portion facing away from the first vent.
스파크 홀은 측부에서 서로 대면하는 위치에서 마주한 상태로 복수개로 형성될 수 있다.Spark holes may be formed in plurality in a state facing each other at the side facing each other.
스파크 홀은 측부의 둘레를 따라 복수개로 형성될 수 있다.The spark hole may be formed in plural along the circumference of the side part.
저면부에는 제1 벤트로부터 방출되는 스파크를 스파크 홀 부분으로 가이드하는 가이드부가 형성될 수 있다.The bottom portion may be provided with a guide portion for guiding the spark emitted from the first vent to the spark hole portion.
가이드부는, 제2 벤트의 저면부에서 측부 방향으로 경사지게 형성된 경사면일 수 있다.The guide part may be an inclined surface formed to be inclined in the lateral direction from the bottom of the second vent.
가이드부는, 제2 벤트의 상기 저면부에서 상기 측부 방향으로 형성되는 가이드 홈일 수 있다.The guide part may be a guide groove formed in the side direction at the bottom of the second vent.
가이드 홈은 저면부의 중심을 기준으로 복수개가 방사상으로 형성될 수 있다.A plurality of guide grooves may be formed radially with respect to the center of the bottom portion.
본 발명의 일 실시예에 따르면, 내부 압력이 증가하여 제1 벤트에서 발생된 스파크는 제2 벤트를 통과하여 스파크들이 서로간에 접촉 상쇄되는 바, 이차 전지의 외부로 스파크가 발생되는 것을 효과적으로 방지할 수 있다.According to an embodiment of the present invention, the spark generated in the first vent due to the increase in the internal pressure passes through the second vent and the sparks cancel each other's contact with each other, thereby effectively preventing sparks from occurring outside of the secondary battery. Can be.
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 도 1의 이차 전지의 벤트홀에 제2 벤트가 설치된 상태를 개략적으로 도시한 요부 사시도이다.3 is a perspective view schematically illustrating an essential part of a state in which a second vent is installed in a vent hole of the rechargeable battery of FIG. 1.
도 4는 도 3의 이차 전지의 Ⅳ-Ⅳ 선을 따라 잘라서 본 제1 벤트와 제2 벤트가 설치된 상태를 개략적으로 도시한 요부 단면 사시도이다.4 is a cross-sectional perspective view illustrating main parts schematically illustrating a state in which the first vent and the second vent are cut along the line IV-IV of the rechargeable battery of FIG. 3.
도 5는 도 3의 이차 전지의 Ⅴ-Ⅴ 선을 잘라서 본 제1 벤트와 제2 벤트가 설치된 상태의 요부 단면도이다.FIG. 5 is a cross-sectional view illustrating main parts of a state in which the first vent and the second vent are cut along the line VV of the rechargeable battery of FIG. 3.
도 6은 본 발명의 제2 실시예에 따른 제1 벤트와 제2 벤트가 설치된 상태의 요부 단면도이다.6 is a cross-sectional view illustrating main parts of a state in which a first vent and a second vent are installed according to a second exemplary embodiment of the present invention.
도 7은 본 발명의 제3 실시예에 따른 제2 벤트가 설치된 상태를 개략적으로 도시한 요부 저면 사시도이다.7 is a bottom perspective view schematically illustrating a main part in which a second vent according to a third exemplary embodiment of the present invention is installed.
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.
또한, 도면에서 나타난 각 구성의 크기 및 두께는 설명의 편의를 위해 임의로 나타내었으므로, 본 발명이 반드시 도시된 바에 한정되지 않는다.In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to the illustrated.
명세서 전체에서, 어떤 부분이 다른 부분과 "연결"되어 있다고 할 때, 이는 "직접적으로 연결"되어 있는 경우뿐 만 아니라, 다른 부재를 사이에 두고 "간접적으로 연결"된 것도 포함한다. 또한, 어떤 부분이 어떤 구성요소를 "포함"한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 포함할 수 있는 것을 의미한다.Throughout the specification, when a part is "connected" to another part, it includes not only "directly connected", but also "indirectly connected" between other members. In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.
도 1은 본 발명의 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 벤트홀(10a)의 내부에 제1 벤트(41)가 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.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 therein; a cap plate 20 coupled to the opening of the case 15 and having a first vent 41 formed inside the vent hole 10a; and a cap plate 20 And a first current collector for connecting the electrode assembly 10 to the first electrode terminal 21 and the electrode terminals 21 and 22 installed at the first electrode terminal 21 and the second electrode terminal 22. Lead tabs 51 and 52 including a second current collecting tab 52 connecting the tab 51 and the electrode assembly 10 to the second electrode terminal 22.
전극 조립체(10)는 절연체인 세퍼레이터(13)의 양면에 제1 전극(이하, "음극"이라 한다)(11)과 제2 전극(이하, "양극"이라 한다)(12)을 배치하고, 음극(11), 세퍼레이터(13) 및 양극(12)을 젤리롤 상태로 귄취하여 형성될 수 있다.The electrode assembly 10 has a first electrode (hereinafter referred to as "cathode") 11 and a second electrode (hereinafter referred to as "anode") 12 disposed on both sides of the separator 13 as an insulator, The negative electrode 11, the separator 13, and the positive electrode 12 may be formed by drawing a jelly roll.
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(20a) 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(20a)에는 제1 벤트(41)가 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 20a, 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 first vent 41 is formed in the vent hole 20a 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. 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. 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.
도 3은 도 1의 이차 전지의 벤트홀에 제2 벤트가 설치된 상태를 개략적으로 도시한 요부 사시도이고, 도 4는 도 3의 이차 전지의 Ⅳ-Ⅳ 선을 따라 잘라서 본 제1 벤트와 제2 벤트가 설치된 상태를 개략적으로 도시한 요부 단면 사시도이며, 도 5는 도 3의 이차 전지의 Ⅴ-Ⅴ 선을 잘라서 본 제1 벤트와 제2 벤트가 설치된 상태의 요부 단면도이다.FIG. 3 is a perspective view schematically illustrating a state in which a second vent is installed in a vent hole of the secondary battery of FIG. 1, and FIG. 4 is a view of the first vent and the second cut along the line IV-IV of the secondary battery of FIG. 3. FIG. 5 is a cross-sectional perspective view illustrating main parts in a vent state, and FIG. 5 is a cross-sectional view of main parts in a state in which the first vent and the second vent of the secondary battery of FIG. 3 are cut out.
도 3 내지 도 5에 도시된 바와 같이, 벤트홀(10a)에는 제1 벤트(41)의 상측으로 제2 벤트(40)가 설치된다.3 to 5, the vent hole 10a is provided with a second vent 40 above the first vent 41.
제2 벤트(40)는 제1 벤트(41)로부터 발생되는 스파크(41a)가 굴곡된 경로를 형성하면서 배출되도록 하여, 스파크가 캡 플레이트(20)의 외측으로 발산되지 않도록 감쇄되도록 하기 위한 것이다.The second vent 40 allows the spark 41a generated from the first vent 41 to be discharged while forming a curved path, so that the spark does not diverge to the outside of the cap plate 20.
이러한 제2 벤트(40)는, 벤트홀(10a)에 안착되는 안착부(42)와, 안착부(42)로부터 절곡된 상태로 벤트홀(10a)의 내부로 연장되며 스파크 홀(44a)이 형성된 측부(44)와, 측부(44)에 연장되고 제1 벤트(41)로부터 이격된 상태로 대면하는 저면부(46)를 포함할 수 있다.The second vent 40 extends into the vent hole 10a in a state bent from the seating portion 42 and the seating portion 42 seated in the vent hole 10a, and the spark hole 44a is formed. The formed side portion 44 may include a bottom portion 46 extending to the side portion 44 and facing away from the first vent 41.
안착부(42)는 벤트홀(10a)의 개구된 위치에 안착된 상태로 설치되는 것으로, 벤트홀(10a)이 형성된 부분의 캡 플레이트(20)에 고정될 수 있다. The seating part 42 is installed in a state of being seated at an opened position of the vent hole 10a and may be fixed to the cap plate 20 of the portion where the vent hole 10a is formed.
즉, 안착부(42)는 벤트홀(10a)의 개구된 가장자리 부분에 형성된 단차부에 안착된 상태로 고정될 수 있다. 이러한 안착부(42)에는 벤트홀(10a)의 내부 방향으로 측부(44)가 연장될 수 있다.That is, the mounting portion 42 may be fixed in a state of being seated on the stepped portion formed in the open edge portion of the vent hole 10a. The seating portion 42 may have a side portion 44 extending in the inner direction of the vent hole 10a.
측부(44)는 일측은 안착부(42)에 연결되고 타측은 벤트홀(10a)의 내부 방향으로 연장된다. 이러한 측부(44)는 벤트홀(10a)의 내벽면과 이격된 상태로 제1 벤트(41) 방향으로 연장될 수 있다. The side portion 44 is connected to the seating portion 42 and the other side extends in the inner direction of the vent hole 10a. The side portion 44 may extend in the direction of the first vent 41 while being spaced apart from the inner wall surface of the vent hole 10a.
이와 같이, 측부(44)가 벤트홀(10a)의 내벽면으로부터 이격되는 것은 제1 벤트(41)에서 발생된 스파크(41a)가 측부(44)와 벤트홀(10a)의 내벽면의 사이 부분으로 유입되도록 하기 위한 것이다.As such, the side 44 is spaced apart from the inner wall surface of the vent hole 10a so that the spark 41a generated in the first vent 41 is a portion between the side portion 44 and the inner wall surface of the vent hole 10a. It is intended to be introduced into.
측부(44)에는 제1 벤트(41)의 파단에 의해 발생된 스파크(41a)가 배출되는 복수개의 스파크 홀(44a)이 형성된다. The side part 44 is formed with a plurality of spark holes 44a through which the sparks 41a generated by breaking of the first vent 41 are discharged.
측부(44)에는 인입 공간이 형성되는 바, 스파크 홀(44a)은 인입 공간의 내벽면에 관통하도록 형성될 수 있다. The inlet space is formed in the side portion 44, and the spark hole 44a may be formed to penetrate the inner wall surface of the inlet space.
이와 같이, 스파크 홀(44a)이 측부(44)에 형성되는 것은, 제1 벤트(41)에서 발생된 스파크(41a)가 스파크 홀(44a)을 통과하면서 상쇄되도록 하여 캡 플레이트(20)의 외측으로 스파크(41a)가 배출되지 않도록 하기 위한 것이다. 이에 대해서는 이하에서 구체적으로 설명한다.In this way, the spark hole 44a is formed in the side portion 44 so that the spark 41a generated in the first vent 41 is canceled while passing through the spark hole 44a to the outside of the cap plate 20. This is to prevent the spark 41a from being discharged. This will be described in detail below.
스파크 홀(44a)은 측부(44)의 인입 공간의 내벽면에서 서로간에 대향하는 양측에 각각 형성될 수 있다. The spark holes 44a may be formed on both sides of the side wall 44 facing each other on the inner wall surface of the inlet space.
이러한 스파크 홀(44a)은 측부(44)의 대향하는 양측에서 복수개가 복수개의 행과 열을 이루면서 형성될 수 있다. 스파크 홀(44a)은 원통형으로 개구되는 것을 예시적으로 설명하지만, 이에 반드시 한정되는 것은 아니고 다각 형상으로 개구되는 것도 가능하다.The spark hole 44a may be formed by forming a plurality of rows and columns on opposite sides of the side portion 44. Although the spark hole 44a is exemplarily described as being opened in a cylindrical shape, the spark hole 44a is not necessarily limited thereto and may be opened in a polygonal shape.
이와 같이, 스파크 홀(44a)이 인입 공간의 내벽면에 마주한 상태로 관통 형성되는 바, 제1 벤트(41)에서 발생된 스파크는 마주하는 스파크 홀(44a)을 각각 통과하여 인입 공간의 내부에서 접촉하여 상쇄되는 것이 가능하다. 이에 따라, 스파크는 제2 벤트(40)의 외부로 방출되지 않고 인입 공간의 내부에서 효과적으로 감쇄 또는 소멸되는 것이 가능하다.As such, the spark hole 44a penetrates the inner wall surface of the inlet space so that the spark generated in the first vent 41 passes through the opposing spark hole 44a, respectively, in the inside of the inlet space. It is possible to offset by contact. Accordingly, the spark can be effectively attenuated or extinguished inside the inlet space without being discharged to the outside of the second vent 40.
스파크 홀(44a)은 본 실시예에서 마주하는 측면에 각각 형성되는 것을 예시적으로 설명하지만, 이에 반드시 한정되는 것은 아니고 제2 벤트(40)의 측부의 둘레를 따라 형성되는 것도 가능하다.Although the spark hole 44a is exemplarily described to be formed on each side facing each other in the present embodiment, the present invention is not necessarily limited thereto and may be formed along the circumference of the side of the second vent 40.
저면부(46)는 전술한 바와 같이, 제1 벤트(41)와 이격된 상태로 벤트홀(10a)의 내부에 위치될 수 있다. 따라서 제1 벤트(41)에서 방출된 스파크는 저면부(46)에 최초 접촉된 상태에서 측부(44)와 벤트홀(10a)의 내벽면의 사이 공간으로 이동될 수 있다. As described above, the bottom portion 46 may be positioned inside the vent hole 10a while being spaced apart from the first vent 41. Therefore, the spark emitted from the first vent 41 may move to the space between the side portion 44 and the inner wall surface of the vent hole 10a in the state of first contact with the bottom portion 46.
저면부(46)는 본 실시예에서 편평면으로 형성되는 것을 예시적으로 설명하지만, 이에 반드시 한정되는 것은 아니고, 제1 벤트(41)로부터 발생된 스파크의 이동을 유도하도록 표면의 일부분 또는 전체가 일정 형상으로 변형되는 것도 가능하다.Although the bottom portion 46 is exemplarily described as being formed as a flat surface in this embodiment, it is not necessarily limited thereto, and a part or the whole of the surface is induced to induce the movement of the spark generated from the first vent 41. It is also possible to deform to a certain shape.
전술한 바와 같이, 본 실시예의 이차 전지는, 이차 전지의 내부 압력이 증가하는 경우 제1 벤트(41)의 파단이 발생되어 스파크가 방출된다.As described above, in the secondary battery of the present embodiment, when the internal pressure of the secondary battery increases, breakage of the first vent 41 occurs, and sparks are released.
그리고, 제1 벤트(41)로부터 방출된 스파크는 제2 벤트(40)의 저면으로부터 측부(44)로 경로가 변경되면서 이동되어 측부(44)에 형성된 스파크 홀(44a)을 통해 제2 벤트(40)의 인입 공간의 내부로 이동될 수 있다.In addition, the spark discharged from the first vent 41 is moved while the path is changed from the bottom of the second vent 40 to the side 44, and the second vent (a) is formed through the spark hole 44a formed in the side 44. 40 can be moved into the interior of the inlet space.
이와 같이, 제1 벤트(41)에서 발생된 스파크(41a)는 굴곡된 경로를 통해 제2 벤트(40)의 스파크 홀(44a)을 통해 인입 공간으로 방출되는 바, 인입 공간의 내부에서 스파크들이 서로간에 접촉하여 효과적인 상쇄 작용이 발생되어 폭발 안전 사고 발생의 위험을 저감하는 것이 가능하다.As such, the spark 41a generated in the first vent 41 is discharged into the inlet space through the spark hole 44a of the second vent 40 through the curved path. It is possible to reduce the risk of explosion safety accidents by contacting each other and an effective offset action.
도 6은 본 발명의 제2 실시예에 따른 제1 벤트와 제2 벤트가 설치된 상태의 요부 단면도이다. 도 1 내지 도 5와 동일 참조 번호는 동일 또는 유사 기능의 동일 또는 유사 부재를 말한다. 이하에서 동일 참조 번호에 대해서는 그 자세한 설명을 생략한다.6 is a cross-sectional view illustrating main parts of a state in which a first vent and a second vent are installed according to a second exemplary embodiment of the present invention. The same reference numerals as FIGS. 1 to 5 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 6에 도시된 바와 같이, 본 발명의 제2 실시예에 따른 이차 전지는, 제2 벤트(40)에 제1 벤트(41)로부터 방출된 스파크의 이동을 가이드하는 가이드부(147)가 형성된다. As illustrated in FIG. 6, in the secondary battery according to the second exemplary embodiment, a guide part 147 is formed in the second vent 40 to guide the movement of the spark emitted from the first vent 41. do.
가이드부(147)는 제2 벤트(40)의 저면(146)에 형성된 경사면으로 적용될 수 있다. 따라서, 제1 벤트(41)로부터 방출된 스파크는 가이드부(147)의 경사면을 따라 측부(44)에 형성된 스파크 홀(44a) 부분으로 가이드되어 효과적으로 이동될 수 있다.The guide part 147 may be applied to an inclined surface formed on the bottom surface 146 of the second vent 40. Therefore, the spark emitted from the first vent 41 may be guided to the spark hole 44a formed in the side portion 44 along the inclined surface of the guide part 147 to be effectively moved.
도 7은 본 발명의 제3 실시예에 따른 제2 벤트가 설치된 상태를 개략적으로 도시한 요부 저면 사시도이다. 도 1 내지 도 6과 동일 참조 번호는 동일 또는 유사 기능의 동일 또는 유사 부재를 말한다. 이하에서 동일 참조 번호에 대해서는 그 자세한 설명을 생략한다.7 is a bottom perspective view schematically illustrating a main part in which a second vent according to a third exemplary embodiment of the present invention is installed. The same reference numerals as FIGS. 1 to 6 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 7에 도시된 바와 같이, 본 발명의 제2 실시예에 따른 이차 전지의 가이드부(247)는 제2 벤트(40)의 저면(246)에 가이드 홈(247)으로 형성될 수 있다. 이하에서 가이드 홈과 가이드부는 동일 참조번호를 사용한다. As illustrated in FIG. 7, the guide part 247 of the rechargeable battery according to the second exemplary embodiment of the present invention may be formed as a guide groove 247 on the bottom 246 of the second vent 40. Hereinafter, the guide groove and the guide portion use the same reference numerals.
가이드 홈(247)은 제2 벤트(40)의 저면부(46)의 중심에서 가장자리 방향으로 복수개가 방사상으로 형성될 수 있다. 따라서 제1 벤트(41)에서 방출된 스파크는 가이드 홈(247)에 의해 스파크 홀(44a) 방향으로 효과적으로 가이드되어 이동될 수 있다. A plurality of guide grooves 247 may be radially formed in the edge direction from the center of the bottom portion 46 of the second vent 40. Therefore, the spark emitted from the first vent 41 may be effectively guided and moved in the direction of the spark hole 44a by the guide groove 247.
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 -Description of the sign
10...전극 조립체 11...제1 전극10 ... electrode assembly 11 ... first electrode
12...제2 전극 20...캡 플레이트12 ... second electrode 20 ... cap plate
20a..벤트홀 21...제1 전극 단자 Vent hole 21 ... First electrode terminal
22...제2 전극 단자 27...밀봉마개22.2nd electrode terminal 27 ... sealing plug
29..전해액 주입구 40...제2 벤트 29.Electrolyte solution inlet 40 ... 2nd vent
40a..스파크 홀 41...제1 벤트 40a.Spark Hall 41.1st Vent
42...안착부 44...측부 42.Seat 44 ... Side
46...저면부 147, 247.. 가이드부 46.Base part 147, 247..Guide part

Claims (8)

  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 벤트홀의 내부에 제1 벤트가 형성된 캡 플레이트;A cap plate coupled to the opening of the case and having a first vent formed in the vent hole;
    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 탭;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;
    을 포함하고,Including,
    상기 벤트홀을 덮으면서 저면은 상기 제1 벤트와 이격되고, 측면은 상기 벤트홀의 내벽면과 이격되며 복수개의 스파크 홀이 형성된 제2 벤트를 포함하는 이차 전지.A secondary battery covering the vent hole and having a bottom surface spaced apart from the first vent and a side surface spaced apart from an inner wall surface of the vent hole and having a plurality of spark holes formed therein.
  2. 제1항에 있어서,The method of claim 1,
    상기 제2 벤트는, The second vent,
    상기 벤트홀에 안착되는 안착부;A seating portion seated in the vent hole;
    상기 안착부로부터 절곡된 상태로 상기 벤트홀의 내부로 연장되며 인입 공간이 내부에 형성되고, 인입 공간의 내벽면으로 상기 스파크 홀이 형성된 측부; 및A side portion extending into the vent hole in a state bent from the seating portion and having an inlet space formed therein and having the spark hole formed on an inner wall surface of the inlet space; And
    상기 측부에 연장되고 상기 제1 벤트로부터 이격된 상태로 대면하는 저면부;A bottom portion extending to the side and facing away from the first vent;
    를 포함하는 이차 전지.Secondary battery comprising a.
  3. 제2항에 있어서,The method of claim 2,
    상기 스파크 홀은 상기 측부에서 서로 대면하는 위치에서 마주한 상태로 복수개로 형성되는 이차 전지.Secondary battery is formed in a plurality of spark holes facing each other at a position facing each other on the side.
  4. 제2항에 있어서,The method of claim 2,
    상기 스파크 홀은 상기 측부의 둘레를 따라 복수개로 형성되는 이차 전지.The spark hole is a plurality of secondary batteries formed along the periphery of the side portion.
  5. 제2항에 있어서,The method of claim 2,
    상기 저면부에는 상기 제1 벤트로부터 방출되는 스파크를 상기 스파크 홀 부분으로 가이드하는 가이드부가 형성된 이차 전지.A secondary battery having a guide portion in the bottom portion to guide the sparks emitted from the first vent to the spark hole portion.
  6. 제5항에 있어서,The method of claim 5,
    상기 가이드부는,The guide unit,
    상기 제2 벤트의 상기 저면부에서 상기 측부 방향으로 경사지게 형성된 경사면인 이차 전지.The secondary battery is an inclined surface formed to be inclined in the side direction from the bottom portion of the second vent.
  7. 제5항에 있어서,The method of claim 5,
    상기 가이드부는,The guide unit,
    상기 제2 벤트의 상기 저면부에서 상기 측부 방향으로 형성되는 가이드 홈인 이차 전지.The secondary battery is a guide groove formed in the side direction from the bottom portion of the second vent.
  8. 제7항에 있어서,The method of claim 7, wherein
    상기 가이드 홈은 상기 저면부의 중심을 기준으로 복수개가 방사상으로 형성되는 이차 전지.The guide battery has a plurality of secondary batteries are formed radially with respect to the center of the bottom portion.
PCT/KR2017/009662 2016-09-19 2017-09-04 Secondary battery WO2018052209A1 (en)

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