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WO2018043889A1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
WO2018043889A1
WO2018043889A1 PCT/KR2017/006562 KR2017006562W WO2018043889A1 WO 2018043889 A1 WO2018043889 A1 WO 2018043889A1 KR 2017006562 W KR2017006562 W KR 2017006562W WO 2018043889 A1 WO2018043889 A1 WO 2018043889A1
Authority
WO
WIPO (PCT)
Prior art keywords
flame
vent
cap plate
hole
plate
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2017/006562
Other languages
French (fr)
Korean (ko)
Inventor
이현수
변상원
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung SDI Co Ltd
Original Assignee
Samsung SDI Co Ltd
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 Samsung SDI Co Ltd filed Critical Samsung SDI Co Ltd
Publication of WO2018043889A1 publication Critical patent/WO2018043889A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present disclosure relates to a secondary battery that minimizes the emission of a flame to the outside when a cell event occurs.
  • a rechargeable battery is a battery that repeatedly performs charging and discharging, unlike a primary battery.
  • Small capacity secondary batteries can be used in portable electronic devices such as mobile phones, notebook computers and camcorders, and large capacity secondary batteries can be used as power sources for driving motors of hybrid vehicles and electric vehicles.
  • the secondary battery includes an electrode assembly for charging and discharging, a case accommodating the electrode assembly and the electrolyte, a cap plate coupled to the opening of the case, and an electrode terminal installed on the cap plate and electrically connected to the electrode assembly.
  • the cap plate includes a terminal hole for installing electrode terminals, an electrolyte injection hole for electrolyte injection, and a vent hole for discharging internal pressure. Vent plates are provided in the vent holes to close the vent holes. When the internal pressure reaches the set pressure, the notch of the vent plate is cut open to open the vent hole to discharge the internal pressure.
  • a flame generated inside the secondary battery may be ejected to the outside through the cut vent plate and the vent hole. Outgoing flames can cause secondary events, reducing cell safety.
  • One aspect of the present invention is to provide a secondary battery that minimizes external ejection of a flame even when a cell event occurs.
  • a secondary battery includes an electrode assembly for charging and discharging a current, a case accommodating the electrode assembly, a cap plate coupled to an opening of the case, and the cap plate electrically connected to the electrode assembly.
  • the flame control member is provided in correspondence with the inner surface of the cap plate at the vent hole to partially eject the flame, and spaced apart from the first flame vent member at a first interval in the vent hole.
  • the second flame vent member may be installed to partially eject the flame.
  • the first flame vent member and the second flame vent member may form a jet path that is shifted from each other with respect to the plane of the vent plate.
  • the vent plate may be spaced apart from the first flame vent member at a second interval in the vent hole.
  • the vent plate may be installed to correspond to an outer surface of the cap plate.
  • the vent hole may be formed on the inner surface of the cap plate in a stepped manner to weld and support the first flame vent member, and the second flame vent member spaced apart at the first interval from the first stage hole. It may include a second end hole for welding support.
  • the vent hole may further include a third end hole spaced apart from the second end hole by the second interval to weld-support the vent plate.
  • the third end hole may be formed larger than the second end hole in a size set in the length direction of the cap plate.
  • the first flame vent member is connected to the first blocking portion to partially block the first end hole at the first side in the longitudinal direction of the cap plate, and to the first blocking portion at the second side in the longitudinal direction. It may include a first opening for partially opening the first end hole.
  • the second flame vent member may include: a second blocking portion partially blocking the second end hole in response to the first opening portion on the second side, and in response to the first blocking portion on the first side; It may include a second opening for partially opening the second end hole.
  • a first boundary line set between the first blocking portion and the first opening portion may be disposed to be offset by the first distance from the center in the longitudinal direction to the second side.
  • the second boundary line set between the second blocking portion and the second opening portion in the second flame vent member may be disposed to be offset by the second distance from the center in the longitudinal direction to the first side.
  • the first open part and the second open part may include a plurality of holes.
  • the first flame vent member is connected to the first blocking portion to partially block the first end hole on the first side in the width direction of the cap plate, and to the first blocking portion on the second side in the width direction. It may include a first opening for partially opening the first end hole.
  • the second flame vent member may include: a second blocking portion partially blocking the second end hole in response to the first opening portion on the second side, and in response to the first blocking portion on the first side; It may include a second opening for partially opening the second end hole.
  • a twenty-first boundary line set between the first blocking portion and the first opening portion in the first flame vent member may be disposed to be offset by the 21st distance from the center in the width direction to the second side.
  • a twenty-second boundary line set between the second blocking portion and the second opening portion in the second flame vent member may be disposed to be offset by the twenty-second distance from the center of the width direction to the first side.
  • the vent hole is provided with a vent plate and a flame control member, and when the cell event occurs, the flame control member partially blocks and opens the flame, thereby controlling the path length of the flame that is ejected. . Therefore, external blowout of the flame can be minimized and cell safety can be increased.
  • FIG. 1 is a perspective view of a rechargeable battery according to a first exemplary embodiment of the present invention.
  • FIG. 2 is another cross-sectional view along the line II-II of FIG. 1.
  • FIG. 3 is an exploded perspective view illustrating the vent hole, the vent plate, and the first and second flame vent members of the cap plate in FIG. 2.
  • FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3.
  • FIG. 5 is a plan view illustrating an arrangement relationship between a blocking part and an opening part in the first and second flame vent members of FIG. 4.
  • FIG. 6 is a plan view illustrating an arrangement relationship between a blocking part and an opening part in the first and second flame vent members in the rechargeable battery according to the second exemplary embodiment of the present invention.
  • FIG. 1 is a perspective view of a rechargeable battery according to a first exemplary embodiment of the present invention
  • FIG. 2 is another cross-sectional view taken along line II-II of FIG. 1.
  • the secondary battery includes an electrode assembly 10 for charging and discharging a current, a case 15 containing the electrode assembly 10, and a cap plate 20 coupled to an opening of the case 15. ), And first and second electrode terminals (negative and positive terminal) 21 and 22 provided on the cap plate 20.
  • the secondary battery may further include an external short circuit portion 40 on the negative electrode terminal 21 side.
  • the electrode assembly 10 has a first electrode (hereinafter referred to as "cathode”) 11 and a second electrode (hereinafter referred to as “anode”) 12 on both sides of the separator 13 as an insulator.
  • the cathode 11, the separator 13, and the anode 12 may be formed by winding or stacking them in a jelly roll state.
  • the negative electrode 11 and the positive electrode 12 each include coating portions 11a and 12a in which the active material is applied to the current collector of the metal plate, and plain portions 11b and 12b formed of the current collector exposed by not applying the active material. do.
  • 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 or laminated.
  • the uncoated portion 12b of the anode 12 is formed at one end of the anode 12 along the anode 12 to be wound or stacked.
  • the uncoated portions 11b and 12b may be disposed at both ends of the electrode assembly 10, respectively.
  • the uncoated parts may be arranged side by side at one end of the electrode assembly.
  • 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 opening of 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 further includes terminal holes H1 and H2, an electrolyte injection hole 29, and a vent hole 24.
  • the positive electrode terminals 21 and 22 are electrically and mechanically connected to the electrode assembly 10 and are installed in the terminal holes H1 and H2 of the cap plate 20.
  • the positive and negative terminals 21 and 22 are electrically connected to the negative and positive electrodes 11 and 12 of the electrode assembly 10, respectively. Therefore, the electrode assembly 10 is drawn out of the case 15 through the negative and positive terminals 21 and 22.
  • the positive and negative terminals 21 and 22 are rivet terminals 21a and 22a respectively installed in the terminal holes H1 and H2 of the cap plate 20, and the rivet terminals 21a and 22a inside the cap plate 20.
  • Flanges 21b and 22b which are integrally formed at the wide ends of the cap plate 20 and plate terminals 21c and 22c which are disposed outside the cap plate 20 and are connected by riveting or welding to the rivet terminals 21a and 22a.
  • the negative and positive gaskets 36 and 37 are provided between the rivet terminals 21a and 22a of the negative and positive terminal 21 and 22 and the inner surfaces of the terminal holes H1 and H2, respectively. Between the rivet terminals 21a and 22a of the 22 and the cap plate 20 is sealed and electrically insulated.
  • the anode gaskets 36 and 37 are further installed between the flanges 21b and 22b and the inner surface of the cap plate 20 to further seal and electrically connect between the flanges 21b and 22b and the cap plate 20. Insulate. That is, the positive and negative gaskets 36 and 37 are provided with the negative and positive terminals 21 and 22 in the cap plate 20 to prevent leakage of the electrolyte through the terminal holes H1 and H2.
  • the negative lead tabs 51 and 52 electrically and mechanically connect the negative and positive terminals 21 and 22 to the negative and positive electrodes 11 and 12 of the electrode assembly 10, respectively.
  • the positive and negative lead tabs 51 and 52 are coupled to the lower ends of the rivet terminals 21a and 22a to caulk the lower ends so that the negative and positive lead tabs 51 and 52 are connected to the flanges 21b and 22b. While being supported, it is connected to the lower ends of the rivet terminals 21a and 22a.
  • the negative and positive insulating members 61 and 62 are provided between the negative and positive lead tabs 51 and 52 and the cap plate 20, respectively. Insulate electrically.
  • the negative and positive electrode insulating members 61 and 62 are coupled to the cap plate 20 on one side, and the negative and positive lead tabs 51 and 52 and the rivet terminals 21a and 22a and the flanges 21b and 22b on the other side. It wraps around and stabilizes their connection structure.
  • the external short circuit portion 40 on the side of the negative electrode terminal 21 includes a short circuit tab 41 and a short circuit member 43 spaced apart or shorted according to internal pressure that may be generated during overcharging.
  • the shorting tab 41 is electrically connected to the rivet terminal 21a of the negative electrode terminal 21 and disposed outside the cap plate 20 via the insulating member 31.
  • the insulating member 31 is installed between the short tab 41 and the cap plate 20 to electrically insulate the short tab 41 and the cap plate 20. That is, the cap plate 20 is maintained in an electrically insulated state from the negative terminal 21.
  • the shorting tab 41 and the plate terminal 21c are coupled to the upper end of the rivet terminal 21a. Therefore, the short tab 41 and the plate terminal 21c are fixed to the cap plate 20 with the insulating member 31 interposed therebetween.
  • the short circuit member 43 is installed in the short circuit hole 42 formed in the cap plate 20 to seal the short circuit hole 42 to receive the internal pressure of the secondary battery.
  • the shorting tab 41 is connected to the negative electrode terminal 21 and extends along the outside of the shorting member 43. Therefore, the short circuit tab 41 and the short circuit member 43 correspond to the short circuit holes 42, maintain the spaced apart state (solid line state) to face each other, and invert the short circuit member 43 when the internal pressure of the secondary battery rises.
  • a short circuit state (virtual line state) can be formed.
  • the top plate 46 on the positive terminal 22 side electrically connects the plate terminal 22c and the cap plate 20 of the positive terminal 22.
  • the top plate 46 is interposed between the plate terminal 22c and the cap plate 20 and penetrates the rivet terminal 22a.
  • the top plate 46 and the plate terminal 22c are coupled to the top of the rivet terminal 22a to caulk the top, so that the top plate 46 and the plate terminal 22c are coupled to the top of the rivet terminal 22a.
  • the plate terminal 22c is installed outside the cap plate 20 with the top plate 46 interposed therebetween.
  • the anode gasket 37 is further extended between the rivet terminal 22a and the top plate 46. That is, the anode gasket 37 prevents the rivet terminal 22a and the top plate 46 from being electrically connected directly.
  • the rivet terminal 22a is electrically connected to the top plate 46 via the plate terminal 22c. That is, the cap plate 20 is connected to the positive terminal 22 and charged with the positive electrode.
  • the short circuit tab 41 charged with the negative electrode and the short circuit member 43 charged with the positive electrode form an external short circuit with an increase in internal pressure generated during overcharging, thereby safely discharging the current charged in the electrode assembly 10 from the outside. You can.
  • 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 rechargeable battery of the exemplary embodiment further includes a vent plate 25 installed in the vent hole 24 and a flame control member 26 installed in the vent hole 24 inside the vent plate 25.
  • the flame control member 26 is configured to control the path length of the flame ejected from the inside of the cap plate 20 to the outside during the cell event of the secondary battery, thereby minimizing the flame ejected through the vent hole 24.
  • the vent plate 25 is installed to seal the vent hole 24 to discharge the internal pressure of the secondary battery. That is, when the internal pressure reaches the set pressure, the vent plate 25 is cut open to open the vent hole 24.
  • the vent plate 25 has a notch 25a for inducing an incision.
  • FIG. 3 is an exploded perspective view illustrating the vent hole, the vent plate, and the first and second flame vent members of the cap plate in FIG. 2, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3.
  • the flame control member 26 is disposed in a plurality along the thickness direction (z-axis direction) of the cap plate 20 in the vent hole 24, and blows while alternately forming the blocking and opening. Increasing the path length of the flame is minimized to minimize flame ejection.
  • the flame control member 26 includes two first flame vent members 261 and a second flame vent member 262.
  • the first flame vent member 261 is installed in the vent hole 24 to correspond to the inner surface of the cap plate 20 to primarily control the flame generated by the cell event. That is, the first flame vent member 261 is configured to partially block the flame generated by the cell event and to eject only a part of the flame.
  • the second flame vent member 262 is installed at the vent hole 24 to be spaced apart from the first flame vent member 261 and the first interval G1, so that the flame passing through the first flame vent member 261 is secondarily. To control. That is, the second flame vent member 262 is configured to partially block the flame passing through the first flame vent member 261 and to eject only a part of the flame.
  • the first flame vent member 261 and the second flame vent member 262 form a jet path that is shifted from each other with respect to the plane (xy plane) of the vent plate 25. That is, the first and second flame vent members 261 and 262 have partial blowout and partial shutoff on different sides while maintaining the first interval G1.
  • the vent plate 25 is spaced apart from the vent hole 24 by the first flame vent member 261 and the second gap G2. At this time, the vent plate 25 is installed corresponding to the outer surface of the cap plate 20. In the thickness direction (z-axis direction) of the cap plate 20 of the vent hole 24, an installation range of the first and second flame vent members 261 and 262 can be secured.
  • the vent hole 24 includes a first end hole 241, a second end hole 242, and a third end hole 243.
  • the first end hole 241 is formed in the inner surface of the cap plate 20 with a step to support the welding of the first flame vent member 261.
  • the second end hole 242 is spaced apart from the first end hole 241 by the first interval G1 to support the welding of the second flame vent member 262.
  • the third end hole 243 is spaced apart from the second end hole 242 by the second interval G2 to support the welding of the vent plate 25.
  • the third end hole 243 is formed larger than the second end hole 242 in the size set in the longitudinal direction (x-axis direction) of the cap plate 20. Therefore, the flame passing through the second flame vent member 262 acts on the entire area of the vent plate 25 to enable stable cutting of the notch 25a.
  • the first flame vent member 261 includes a first blocking portion 263 and a first opening portion 264.
  • the first blocking portion 263 partially blocks the first end hole 241 at the first side (left side, FIG. 4) in the longitudinal direction (x-axis direction) of the cap plate 20.
  • the first opening portion 264 is connected to the first blocking portion 263 at the second side (right side, FIG. 4) in the longitudinal direction (x-axis direction) to partially open the first end hole 241.
  • the first opening part 264 has a plurality of holes.
  • the second flame vent member 262 includes a second blocking portion 265 and a second opening portion 266.
  • the second blocking part 265 partially blocks the second end hole 242 at the second side (right side, see FIG. 4) corresponding to the first opening part 264.
  • the second open portion 266 partially opens the second end hole 242 at the first side (left side, see FIG. 4) corresponding to the first blocking portion 263.
  • the second open part 266 includes a plurality of holes.
  • FIG. 5 is a plan view illustrating an arrangement relationship between a blocking part and an opening part in the first and second flame vent members of FIG. 4. 4 and 5, a first boundary line B1 is set between the first blocking portion 263 and the first opening portion 264 in the first flame vent member 261.
  • the first boundary line B1 is disposed to be offset by the first distance L1 from the center in the longitudinal direction (x-axis direction) to the second side (right side, see FIGS. 4 and 5).
  • a second boundary line B2 is set between the second blocking portion 265 and the second opening portion 266.
  • the second boundary line B2 is disposed to be biased by the second distance L2 from the center in the longitudinal direction (x-axis direction) to the first side (right side, see FIGS. 4 and 5).
  • the flame generated inside the cell event is partially blocked by the first blocking portion 263 of the first flame vent member 261 and is ejected through the first opening portion 264.
  • the flame ejected to the first open portion 264 of the first flame vent member 261 moves in the longitudinal direction (x-axis direction) by the sum distance L1 + L2 of the first and second distances L1 and L2. do.
  • the moved flame is partially blocked by the second blocking portion 265 of the second flame vent member 262 and is ejected through the second open portion 266.
  • the path length of the flame ejected by the sum distance L1 + L2 becomes long. Therefore, the flame is blocked at the first and second blocking portions 263 and 265 a lot, and the first and second openings 264 and 266 may be partially blown out through the cut vent plate 25. have. As such, when the cell event occurs, the external ejection of the flame through the vent hole 24 is minimized, thereby increasing the cell safety.
  • FIG. 6 is a plan view illustrating an arrangement relationship between a blocking part and an opening part in the first and second flame vent members in the rechargeable battery according to the second exemplary embodiment of the present invention.
  • the first flame vent member 361 includes a first blocking part 363 and a first opening part 364.
  • the first blocking portion 363 partially recesses the first end hole 241 (see FIG. 4 below) on the first side (upper side, see FIG. 6) in the width direction (y-axis direction) of the cap plate 20. Block it.
  • the first opening portion 364 is connected to the first blocking portion 363 at the second side (lower side, see FIG. 6) in the width direction (y-axis direction) to partially open the first end hole 241.
  • the second flame vent member 362 includes a second blocking portion 365 and a second opening portion 366.
  • the second blocking part 365 partially blocks the second end hole 242 (see FIG. 4) in response to the first opening part 364 at the second side (lower side, see FIG. 6).
  • the second open portion 366 partially opens the second end hole 242 at the first side (upper side, see FIG. 6) corresponding to the first blocking portion 363.
  • the twenty-first boundary line B21 is set between the first blocking portion 363 and the first opening portion 364 in the first flame vent member 361.
  • the twenty-first boundary line B21 is disposed to be offset by the twenty-first distance L21 from the center in the width direction (y-axis direction) to the second side (lower side, see FIG. 6).
  • the twenty-second boundary line B22 is set between the second blocking portion 365 and the second opening portion 366.
  • the twenty-second boundary line B22 is disposed to be offset by the twenty-second distance L22 from the center in the width direction (y-axis direction) to the first side (upper side, see FIG. 6).
  • the flame generated inside the cell event is partially blocked by the first blocking portion 363 of the first flame vent member 361 and is ejected through the first opening 364.
  • the flame ejected to the first open portion 364 of the first flame vent member 361 moves in the width direction (y-axis direction) by the sum distance L21 + L22 of the twenty-first and twenty-second distances L21 and L22. do.
  • the moved flame is partially blocked by the second blocking portion 365 of the second flame vent member 362 and is ejected through the second open portion 366.
  • the path length of the flame ejected by the sum distance L21 + L22 becomes long. Therefore, the flame is largely blocked at the first and second blocking parts 363 and 365, and the first and second opening parts 364 and 366 are combined to pass through the cut vent plate 25 (see FIG. 4). Only part of it can be ejected to the outside. As such, during the cell event, external blowout of the flame through the vent hole 24 (see FIG. 4) is minimized, thereby increasing cell safety.
  • electrode assembly 11 first electrode (cathode)
  • vent plate 26 flame control member
  • B1 and B21 First and 21st boundary lines
  • B2 and B22 Second and 22nd boundary lines
  • G1, G2 first and second intervals H1, H2: terminal hole
  • L1 L21: 1st, 21st distance L2, L22: 2nd, 22nd distance

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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)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

A secondary battery according to one embodiment of the present invention comprises: an electrode assembly for charging and discharging current; a case for accommodating the electrode assembly; a cap plate coupled to an aperture of the case; an electrode terminal electrically connected to the electrode assembly and drawn to the outside through the cap plate; a vent plate provided in a vent hole of the cap plate; and a flame control member provided in the vent hole inside the vent plate so as to control the path length of the flame spouting from the inside of the cap plate to the outside.

Description

이차 전지Secondary battery

본 기재는 셀 이벤트 발생시, 화염(flame)이 외부로 분출되는 것을 최소화하는 이차 전지에 관한 것이다.The present disclosure relates to a secondary battery that minimizes the emission of a flame to the outside when a cell event occurs.

이차 전지(rechargeable battery)는 일차 전지와 달리 충전 및 방전을 반복적으로 수행하는 전지이다. 소용량의 이차 전지는 휴대폰이나 노트북 컴퓨터 및 캠코더와 같이 휴대가 가능한 소형 전자기기에 사용되고, 대용량 이차 전지는 하이브리드 자동차 및 전기 자동차의 모터 구동용 전원으로 사용될 수 있다.A rechargeable battery is a battery that repeatedly performs charging and discharging, unlike a primary battery. Small capacity secondary batteries can be used in portable electronic devices such as mobile phones, notebook computers and camcorders, and large capacity secondary batteries can be used as power sources for driving motors of hybrid vehicles and electric vehicles.

예를 들면, 이차 전지는 충전 및 방전 작용하는 전극 조립체, 전극 조립체와 전해액을 수용하는 케이스, 케이스의 개구에 결합되는 캡 플레이트, 캡 플레이트에 설치되어 전극 조립체에 전기적으로 연결되는 전극단자를 포함한다.For example, the secondary battery includes an electrode assembly for charging and discharging, a case accommodating the electrode assembly and the electrolyte, a cap plate coupled to the opening of the case, and an electrode terminal installed on the cap plate and electrically connected to the electrode assembly. .

캡 플레이트는 전극단자 설치를 위한 단자홀, 전해액 주입을 위한 전해액 주입구, 및 내부 압력을 배출하는 벤트 홀을 구비한다. 벤트 홀에는 벤트 플레이트가 설치되어 벤트 홀을 폐쇄하고 있다. 내부 압력이 설정압에 이르면, 벤트 플레이트의 노치가 절개되면서 벤트 홀이 개방되어 내부 압력을 배출한다.The cap plate includes a terminal hole for installing electrode terminals, an electrolyte injection hole for electrolyte injection, and a vent hole for discharging internal pressure. Vent plates are provided in the vent holes to close the vent holes. When the internal pressure reaches the set pressure, the notch of the vent plate is cut open to open the vent hole to discharge the internal pressure.

그러나 셀 이벤트 발생시, 이차 전지의 내부에서 발생되는 화염(flame)이 절개된 벤트 플레이트 및 벤트 홀을 통하여 외부로 분출될 수 있다. 외부로 분출되는 화염은 2차 이벤트를 발생시킬 수 있으므로 셀 안전성을 저하시킨다.However, when a cell event occurs, a flame generated inside the secondary battery may be ejected to the outside through the cut vent plate and the vent hole. Outgoing flames can cause secondary events, reducing cell safety.

본 발명의 일 측면은 셀 이벤트 발생시에도, 화염(flame)의 외부 분출을 최소화하는 이차 전지를 제공하는 것이다.One aspect of the present invention is to provide a secondary battery that minimizes external ejection of a flame even when a cell event occurs.

본 발명의 일 실시예에 따른 이차 전지는, 전류를 충전 및 방전하는 전극 조립체, 상기 전극 조립체를 수용하는 케이스, 상기 케이스의 개구에 결합되는 캡 플레이트, 상기 전극 조립체에 전기적으로 연결되어 상기 캡 플레이트를 통하여 외부로 인출되는 전극단자, 상기 캡 플레이트의 벤트 홀에 설치되는 벤트 플레이트, 및 상기 벤트 플레이트의 내측에서 상기 벤트 홀에 설치되어 상기 캡 플레이트의 내측에서 외부로 분출되는 화염의 경로 길이를 제어하는 화염 제어 부재를 포함한다.According to an embodiment of the present invention, a secondary battery includes an electrode assembly for charging and discharging a current, a case accommodating the electrode assembly, a cap plate coupled to an opening of the case, and the cap plate electrically connected to the electrode assembly. An electrode terminal drawn out to the outside, a vent plate installed in the vent hole of the cap plate, and a path length of a flame installed in the vent hole inside the vent plate and ejected from the inside of the cap plate to the outside And a flame control member.

상기 화염 제어 부재는, 상기 벤트 홀에서 상기 캡 플레이트의 내표면에 대응하여 설치되어 부분적으로 화염을 분출하는 제1화염 벤트 부재, 및 상기 벤트 홀에서 상기 제1화염 벤트 부재와 제1간격으로 이격되 설치되어 부분적으로 화염을 분출하는 제2화염 벤트 부재를 포함할 수 있다.The flame control member is provided in correspondence with the inner surface of the cap plate at the vent hole to partially eject the flame, and spaced apart from the first flame vent member at a first interval in the vent hole. The second flame vent member may be installed to partially eject the flame.

상기 제1화염 벤트 부재와 상기 제2화염 벤트 부재는 상기 벤트 플레이트의 평면에 대하여 서로 어긋나는 분출 경로를 형성할 수 있다.The first flame vent member and the second flame vent member may form a jet path that is shifted from each other with respect to the plane of the vent plate.

상기 벤트 플레이트는 상기 벤트 홀에서 상기 제1화염 벤트 부재와 제2간격으로 이격 설치될 수 있다.The vent plate may be spaced apart from the first flame vent member at a second interval in the vent hole.

상기 벤트 플레이트는 상기 캡 플레이트의 외표면에 대응하여 설치될 수 있다.The vent plate may be installed to correspond to an outer surface of the cap plate.

상기 벤트 홀은 상기 캡 플레이트의 내표면에 단차로 형성되어 상기 제1화염 벤트 부재를 용접 지지하는 제1단 홀, 및 상기 제1단 홀에서 상기 제1간격으로 이격되어 상기 제2화염 벤트 부재를 용접 지지하는 제2단 홀을 포함할 수 있다.The vent hole may be formed on the inner surface of the cap plate in a stepped manner to weld and support the first flame vent member, and the second flame vent member spaced apart at the first interval from the first stage hole. It may include a second end hole for welding support.

상기 벤트 홀은 상기 제2단 홀에서 상기 제2간격으로 이격되어 상기 벤트 플레이트를 용접 지지하는 제3단 홀을 더 포함할 수 있다.The vent hole may further include a third end hole spaced apart from the second end hole by the second interval to weld-support the vent plate.

상기 제3단 홀은 상기 캡 플레이트의 길이 방향으로 설정되는 크기에서 상기 제2단 홀보다 크게 형성될 수 있다.The third end hole may be formed larger than the second end hole in a size set in the length direction of the cap plate.

상기 제1화염 벤트 부재는 상기 캡 플레이트의 길이 방향의 제1측에서 상기 제1단 홀을 부분적으로 차단하는 제1차단부, 및 상기 길이 방향의 제2측에서 상기 제1차단부에 연결되어 상기 제1단 홀을 부분적으로 개방하는 제1개방부를 포함할 수 있다.The first flame vent member is connected to the first blocking portion to partially block the first end hole at the first side in the longitudinal direction of the cap plate, and to the first blocking portion at the second side in the longitudinal direction. It may include a first opening for partially opening the first end hole.

상기 제2화염 벤트 부재는 상기 제2측에서 상기 제1개방부에 대응하여 상기 제2단 홀을 부분적으로 차단하는 제2차단부, 및 상기 제1측에서 상기 제1차단부에 대응하여 상기 제2단 홀을 부분적으로 개방하는 제2개방부를 포함할 수 있다.The second flame vent member may include: a second blocking portion partially blocking the second end hole in response to the first opening portion on the second side, and in response to the first blocking portion on the first side; It may include a second opening for partially opening the second end hole.

상기 제1화염 벤트 부재에서 상기 제1차단부와 상기 제1개방부 사이에 설정되는 제1경계선은 상기 길이 방향의 중앙에서 상기 제2측으로 제1거리만큼 치우쳐 배치될 수 있다. In the first flame vent member, a first boundary line set between the first blocking portion and the first opening portion may be disposed to be offset by the first distance from the center in the longitudinal direction to the second side.

상기 제2화염 벤트 부재에서 상기 제2차단부와 상기 제2개방부 사이에 설정되는 제2경계선은 상기 길이 방향의 중앙에서 상기 제1측으로 제2거리만큼 치우쳐 배치될 수 있다.The second boundary line set between the second blocking portion and the second opening portion in the second flame vent member may be disposed to be offset by the second distance from the center in the longitudinal direction to the first side.

상기 제1개방부 및 상기 제2개방부는 복수의 홀들을 구비할 수 있다.The first open part and the second open part may include a plurality of holes.

상기 제1화염 벤트 부재는 상기 캡 플레이트의 폭 방향의 제1측에서 상기 제1단 홀을 부분적으로 차단하는 제1차단부, 및 상기 폭 방향의 제2측에서 상기 제1차단부에 연결되어 상기 제1단 홀을 부분적으로 개방하는 제1개방부를 포함할 수 있다.The first flame vent member is connected to the first blocking portion to partially block the first end hole on the first side in the width direction of the cap plate, and to the first blocking portion on the second side in the width direction. It may include a first opening for partially opening the first end hole.

상기 제2화염 벤트 부재는 상기 제2측에서 상기 제1개방부에 대응하여 상기 제2단 홀을 부분적으로 차단하는 제2차단부, 및 상기 제1측에서 상기 제1차단부에 대응하여 상기 제2단 홀을 부분적으로 개방하는 제2개방부를 포함할 수 있다.The second flame vent member may include: a second blocking portion partially blocking the second end hole in response to the first opening portion on the second side, and in response to the first blocking portion on the first side; It may include a second opening for partially opening the second end hole.

상기 제1화염 벤트 부재에서 상기 제1차단부와 상기 제1개방부 사이에 설정되는 제21경계선은 상기 폭 방향의 중앙에서 상기 제2측으로 제21거리만큼 치우쳐 배치될 수 있다. A twenty-first boundary line set between the first blocking portion and the first opening portion in the first flame vent member may be disposed to be offset by the 21st distance from the center in the width direction to the second side.

상기 제2화염 벤트 부재에서 상기 제2차단부와 상기 제2개방부 사이에 설정되는 제22경계선은 상기 폭 방향의 중앙에서 상기 제1측으로 제22거리만큼 치우쳐 배치될 수 있다.A twenty-second boundary line set between the second blocking portion and the second opening portion in the second flame vent member may be disposed to be offset by the twenty-second distance from the center of the width direction to the first side.

본 발명의 일 실시예에 따르면, 벤트 홀에 벤트 플레이트와 화염 제어 부재를 구비하여, 셀 이벤트 발생시, 화염 제어 부재에서 화염을 부분적으로 차단 및 개방하므로 분출되는 화염의 경로 길이를 길게 제어할 수 있다. 따라서 화염(flame)의 외부 분출이 최소화 되며, 셀 안전성이 높아질 수 있다.According to an embodiment of the present invention, the vent hole is provided with a vent plate and a flame control member, and when the cell event occurs, the flame control member partially blocks and opens the flame, thereby controlling the path length of the flame that is ejected. . Therefore, external blowout of the flame can be minimized and cell safety can be increased.

도 1은 본 발명의 제1실시예에 따른 이차 전지의 사시도이다.1 is a perspective view of a rechargeable battery according to a first exemplary embodiment of the present invention.

도 2는 도 1의 Ⅱ-Ⅱ 선을 따라 다른 단면도이다.FIG. 2 is another cross-sectional view along the line II-II of FIG. 1.

도 3은 도 2에서 캡 플레이트의 벤트 홀과 벤트 플레이트 및 제1, 제2화염 벤트 부재를 분해하여 도시한 분해 사시도이다.3 is an exploded perspective view illustrating the vent hole, the vent plate, and the first and second flame vent members of the cap plate in FIG. 2.

도 4는 도 3의 Ⅳ-Ⅳ 선을 따라 자른 단면도이다.4 is a cross-sectional view taken along the line IV-IV of FIG. 3.

도 5는 도 4의 제1, 제2화염 벤트 부재에서 차단부와 개방부의 배치 관계를 도시한 평면도이다.FIG. 5 is a plan view illustrating an arrangement relationship between a blocking part and an opening part in the first and second flame vent members of FIG. 4.

도 6은 본 발명의 제2실시예에 따른 이차 전지에서, 제1, 제2화염 벤트 부재에서 차단부와 개방부의 배치 관계를 도시한 평면도이다.FIG. 6 is a plan view illustrating an arrangement relationship between a blocking part and an opening part in the first and second flame vent members in the rechargeable battery according to the second exemplary embodiment of the present invention.

이하, 첨부한 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서는 동일한 참조부호를 붙였다.In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

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 제1실시예에 따른 이차 전지의 사시도이고, 도 2는 도 1의 Ⅱ-Ⅱ 선을 따라 다른 단면도이다. 도 1 및 도 2를 참조하면, 이차 전지는 전류를 충전 및 방전하는 전극 조립체(10), 전극 조립체(10)를 내장하는 케이스(15), 케이스(15)의 개구에 결합되는 캡 플레이트(20), 및 캡 플레이트(20)에 설치되는 제1, 제2전극단자(음, 양극 단자)(21, 22)를 포함한다. 이차 전지는 음극 단자(21) 측에 외부 단락부(40)를 더 구비할 수 있다.1 is a perspective view of a rechargeable battery according to a first exemplary embodiment of the present invention, and FIG. 2 is another cross-sectional view taken along line II-II of FIG. 1. 1 and 2, the secondary battery includes an electrode assembly 10 for charging and discharging a current, a case 15 containing the electrode assembly 10, and a cap plate 20 coupled to an opening of the case 15. ), And first and second electrode terminals (negative and positive terminal) 21 and 22 provided on the cap plate 20. The secondary battery may further include an external short circuit portion 40 on the negative electrode terminal 21 side.

일례를 들면, 전극 조립체(10)는 절연체인 세퍼레이터(13)의 양면에 제1전극(이하, "음극"이라 한다)(11)과 제2전극(이하, "양극"이라 한다)(12)을 배치하고, 음극(11), 세퍼레이터(13) 및 양극(12)을 젤리롤 상태로 귄취하거나, 적층하여 형성될 수 있다.For example, the electrode assembly 10 has a first electrode (hereinafter referred to as "cathode") 11 and a second electrode (hereinafter referred to as "anode") 12 on both sides of the separator 13 as an insulator. And the cathode 11, the separator 13, and the anode 12 may be formed by winding or stacking them in a jelly roll 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 coating portions 11a and 12a in which the active material is applied to the current collector of the metal plate, and plain portions 11b and 12b formed of the current collector exposed by not applying the active material. do.

음극(11)의 무지부(11b)는 권취 또는 적층되는 음극(11)을 따라 음극(11)의 한 쪽 단부에 형성된다. 양극(12)의 무지부(12b)는 권취 또는 적층되는 양극(12)을 따라 양극(12)의 한 쪽 단부에 형성된다. 이와 같이, 무지부들(11b, 12b)은 전극 조립체(10)의 양단에 각각 배치될 수 있다. 또한 도시하지 않았으나, 무지부들은 전극 조립체의 한쪽 단에 나란하게 배치될 수도 있다.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 or laminated. The uncoated portion 12b of the anode 12 is formed at one end of the anode 12 along the anode 12 to be wound or stacked. As such, the uncoated portions 11b and 12b may be disposed at both ends of the electrode assembly 10, respectively. Also, although not shown, the uncoated parts may be arranged side by side at one end of the electrode assembly.

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 설치되어 케이스(15)의 개구를 밀폐한다. 예를 들면, 케이스(15)와 캡 플레이트(20)는 알루미늄으로 형성되어 서로 용접될 수 있다. 또한, 캡 플레이트(20)는 단자홀(H1, H2), 전해액 주입구(29) 및 벤트 홀(24)을 더 구비한다.The cap plate 20 is installed in the opening of the case 15 to seal the opening of the case 15. For example, the case 15 and the cap plate 20 may be made of aluminum and welded to each other. In addition, the cap plate 20 further includes terminal holes H1 and H2, an electrolyte injection hole 29, and a vent hole 24.

음, 양극 단자(21, 22)는 전극 조립체(10)에 전기적 및 기계적으로 연결되어 캡 플레이트(20)의 단자홀(H1, H2)에 설치된다. 즉 음, 양극 단자(21, 22)는 전극 조립체(10)의 음, 양극(11, 12)에 각각 전기적으로 연결된다. 따라서 전극 조립체(10)는 음, 양극 단자(21, 22)를 통하여 케이스(15)의 외부로 인출된다.Well, the positive electrode terminals 21 and 22 are electrically and mechanically connected to the electrode assembly 10 and are installed in the terminal holes H1 and H2 of the cap plate 20. In other words, the positive and negative terminals 21 and 22 are electrically connected to the negative and positive electrodes 11 and 12 of the electrode assembly 10, respectively. Therefore, the electrode assembly 10 is drawn out of the case 15 through the negative and positive terminals 21 and 22.

음, 양극 단자(21, 22)는 캡 플레이트(20)의 내측에서 서로 동일한 구조를 형성하므로 동일 구조에 대하여 함께 설명하고, 캡 플레이트(20)의 외측에서 서로 다른 구조를 형성하므로 다른 구조에 대하여 각각 별도로 설명한다.Well, since the anode terminals 21 and 22 form the same structure with each other on the inside of the cap plate 20, the same structure will be described together, and since the different structures are formed on the outside of the cap plate 20, the different structures will be described. Each will be explained separately.

음, 양극 단자(21, 22)는 캡 플레이트(20)의 단자홀(H1, H2)에 각각 설치되는 리벳 터미널(21a, 22a), 캡 플레이트(20)의 내측에서 리벳 터미널(21a, 22a)에 일체로 넓게 형성되는 플랜지(21b, 22b), 및 캡 플레이트(20)의 외측에 배치되어 리벳 터미널(21a, 22a)에 리벳팅 또는 용접으로 연결되는 플레이트 터미널(21c, 22c)을 포함한다.The positive and negative terminals 21 and 22 are rivet terminals 21a and 22a respectively installed in the terminal holes H1 and H2 of the cap plate 20, and the rivet terminals 21a and 22a inside the cap plate 20. Flanges 21b and 22b which are integrally formed at the wide ends of the cap plate 20 and plate terminals 21c and 22c which are disposed outside the cap plate 20 and are connected by riveting or welding to the rivet terminals 21a and 22a.

음, 양극 개스킷(36, 37)은 음, 양극 단자(21, 22)의 리벳 터미널(21a, 22a)과 단자홀(H1, H2)의 내면 사이에 각각 설치되어, 음, 양극 단자(21, 22)의 리벳 터미널(21a, 22a)과 캡 플레이트(20) 사이를 실링하고 전기적으로 절연한다.The negative and positive gaskets 36 and 37 are provided between the rivet terminals 21a and 22a of the negative and positive terminal 21 and 22 and the inner surfaces of the terminal holes H1 and H2, respectively. Between the rivet terminals 21a and 22a of the 22 and the cap plate 20 is sealed and electrically insulated.

음, 양극 개스킷(36, 37)은 플랜지(21b, 22b)와 캡 플레이트(20)의 내면 사이에 더 연장 설치되어, 플랜지(21b, 22b)와 캡 플레이트(20) 사이를 더 실링하고 전기적으로 절연한다. 즉 음, 양극 개스킷(36, 37)은 캡 플레이트(20)에 음, 양극 단자(21, 22)를 설치함으로써 단자홀(H1, H2)을 통하여 전해액이 새는 것(leak)을 방지한다.Well, the anode gaskets 36 and 37 are further installed between the flanges 21b and 22b and the inner surface of the cap plate 20 to further seal and electrically connect between the flanges 21b and 22b and the cap plate 20. Insulate. That is, the positive and negative gaskets 36 and 37 are provided with the negative and positive terminals 21 and 22 in the cap plate 20 to prevent leakage of the electrolyte through the terminal holes H1 and H2.

음, 양극 리드 탭(51, 52)은 음, 양극 단자(21, 22)를 전극 조립체(10)의 음, 양극(11, 12)에 각각 전기적 및 기계적으로 직접 연결한다. 즉 음, 양극 리드 탭(51, 52)을 리벳 터미널(21a, 22a)의 하단에 결합하여 하단을 코킹(caulking)함으로써, 음, 양극 리드 탭(51, 52)은 플랜지(21b, 22b)에 지지되면서 리벳 터미널(21a, 22a)의 하단에 연결된다.The negative lead tabs 51 and 52 electrically and mechanically connect the negative and positive terminals 21 and 22 to the negative and positive electrodes 11 and 12 of the electrode assembly 10, respectively. In other words, the positive and negative lead tabs 51 and 52 are coupled to the lower ends of the rivet terminals 21a and 22a to caulk the lower ends so that the negative and positive lead tabs 51 and 52 are connected to the flanges 21b and 22b. While being supported, it is connected to the lower ends of the rivet terminals 21a and 22a.

음, 양극 절연부재(61, 62)는 음, 양극 리드 탭(51, 52)과 캡 플레이트(20) 사이에 각각 설치되어, 음, 양극 리드 탭(51, 52)과 캡 플레이트(20)를 전기적으로 절연시킨다. 또한 음, 양극 절연부재(61, 62)는 일측으로 캡 플레이트(20)에 결합되고 다른 일측으로 음, 양극 리드 탭(51, 52)과 리벳 터미널(21a, 22a) 및 플랜지(21b, 22b)를 감싸므로 이들의 연결 구조를 안정시킨다.The negative and positive insulating members 61 and 62 are provided between the negative and positive lead tabs 51 and 52 and the cap plate 20, respectively. Insulate electrically. In addition, the negative and positive electrode insulating members 61 and 62 are coupled to the cap plate 20 on one side, and the negative and positive lead tabs 51 and 52 and the rivet terminals 21a and 22a and the flanges 21b and 22b on the other side. It wraps around and stabilizes their connection structure.

한편, 음극 단자(21)의 플레이트 터미널(21c)과 관련하여 외부 단락부(40)에 대하여 설명하고, 양극 단자(22)의 플레이트 터미널(22c)과 관련하여 탑 플레이트(46)에 대하여 설명한다.On the other hand, the external short circuit portion 40 will be described with respect to the plate terminal 21c of the negative electrode terminal 21, and the top plate 46 will be described with respect to the plate terminal 22c of the positive electrode terminal 22. FIG. .

음극 단자(21) 측의 외부 단락부(40)는 과충전 시 발생될 수 있는 내부 압력에 따라 이격 또는 단락되는 단락 탭(41)과 단락부재(43)를 포함한다. 단락 탭(41)은 음극 단자(21)의 리벳 터미널(21a)에 전기적으로 연결되어 절연부재(31)를 개재하여 캡 플레이트(20)의 외측에 배치된다.The external short circuit portion 40 on the side of the negative electrode terminal 21 includes a short circuit tab 41 and a short circuit member 43 spaced apart or shorted according to internal pressure that may be generated during overcharging. The shorting tab 41 is electrically connected to the rivet terminal 21a of the negative electrode terminal 21 and disposed outside the cap plate 20 via the insulating member 31.

절연부재(31)는 단락 탭(41)과 캡 플레이트(20) 사이에 설치되어, 단락 탭(41)과 캡 플레이트(20)를 전기적으로 절연시킨다. 즉 캡 플레이트(20)는 음극 단자(21)와 전기적으로 절연된 상태를 유지한다.The insulating member 31 is installed between the short tab 41 and the cap plate 20 to electrically insulate the short tab 41 and the cap plate 20. That is, the cap plate 20 is maintained in an electrically insulated state from the negative terminal 21.

단락 탭(41)과 플레이트 터미널(21c)을 리벳 터미널(21a)의 상단에 결합하여 상단을 코킹함으로써, 단락 탭(41)과 플레이트 터미널(21c)은 리벳 터미널(21a)의 상단에 결합된다. 따라서 단락 탭(41)과 플레이트 터미널(21c)은 절연부재(31)를 개재한 상태로 캡 플레이트(20)에 고정된다.By coupling the upper end of the shorting tab 41 and the plate terminal 21c to the upper end of the rivet terminal 21a, the shorting tab 41 and the plate terminal 21c are coupled to the upper end of the rivet terminal 21a. Therefore, the short tab 41 and the plate terminal 21c are fixed to the cap plate 20 with the insulating member 31 interposed therebetween.

단락부재(43)는 캡 플레이트(20)에 형성되는 단락 홀(42)에 설치되어 단락 홀(42)을 밀폐하므로 이차 전지의 내압을 받는다. 단락 탭(41)은 음극 단자(21)에 연결되어 단락부재(43)의 외측을 따라 신장된다. 따라서 단락 탭(41)과 단락부재(43)는 단락 홀(42)에 대응하고, 서로 마주하여 이격 상태(실선 상태)를 유지하고, 이차 전지의 내압 상승시 단락부재(43)의 반전에 의하여 단락 상태(가상선 상태)를 형성할 수 있다.The short circuit member 43 is installed in the short circuit hole 42 formed in the cap plate 20 to seal the short circuit hole 42 to receive the internal pressure of the secondary battery. The shorting tab 41 is connected to the negative electrode terminal 21 and extends along the outside of the shorting member 43. Therefore, the short circuit tab 41 and the short circuit member 43 correspond to the short circuit holes 42, maintain the spaced apart state (solid line state) to face each other, and invert the short circuit member 43 when the internal pressure of the secondary battery rises. A short circuit state (virtual line state) can be formed.

양극 단자(22) 측의 탑 플레이트(46)는 양극 단자(22)의 플레이트 터미널(22c)과 캡 플레이트(20)를 전기적으로 연결한다. 예를 들면, 탑 플레이트(46)는 플레이트 터미널(22c)과 캡 플레이트(20) 사이에 개재되고 리벳 터미널(22a)을 관통시킨다.The top plate 46 on the positive terminal 22 side electrically connects the plate terminal 22c and the cap plate 20 of the positive terminal 22. For example, the top plate 46 is interposed between the plate terminal 22c and the cap plate 20 and penetrates the rivet terminal 22a.

따라서 탑 플레이트(46)와 플레이트 터미널(22c)을 리벳 터미널(22a)의 상단에 결합하여 상단을 코킹함으로써, 탑 플레이트(46)와 플레이트 터미널(22c)은 리벳 터미널(22a)의 상단에 결합된다. 플레이트 터미널(22c)은 탑 플레이트(46)를 개재한 상태로 캡 플레이트(20)의 외측에 설치된다.Therefore, the top plate 46 and the plate terminal 22c are coupled to the top of the rivet terminal 22a to caulk the top, so that the top plate 46 and the plate terminal 22c are coupled to the top of the rivet terminal 22a. . The plate terminal 22c is installed outside the cap plate 20 with the top plate 46 interposed therebetween.

한편, 양극 개스킷(37)은 리벳 터미널(22a)과 탑 플레이트(46) 사이로 더 연장되어 설치된다. 즉 양극 개스킷(37)은 리벳 터미널(22a)과 탑 플레이트(46)가 전기적으로 직접 연결되는 것을 방지한다. On the other hand, the anode gasket 37 is further extended between the rivet terminal 22a and the top plate 46. That is, the anode gasket 37 prevents the rivet terminal 22a and the top plate 46 from being electrically connected directly.

따라서 리벳 터미널(22a)은 플레이트 터미널(22c)을 경유하여 탑 플레이트(46)에 전기적으로 연결된다. 즉 캡 플레이트(20)는 양극 단자(22)에 연결되어 양극으로 대전된다. 이로 인하여, 음극으로 대전되는 단락 탭(41)과 양극으로 대전되는 단락부재(43)는 과충전시 발생되는 내압 상승으로 외부 단락을 형성하여, 전극 조립체(10)에 충전된 전류를 외부에서 안전하게 방전시킬 수 있다.Thus, the rivet terminal 22a is electrically connected to the top plate 46 via the plate terminal 22c. That is, the cap plate 20 is connected to the positive terminal 22 and charged with the positive electrode. As a result, the short circuit tab 41 charged with the negative electrode and the short circuit member 43 charged with the positive electrode form an external short circuit with an increase in internal pressure generated during overcharging, thereby safely discharging the current charged in the electrode assembly 10 from the outside. You can.

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.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.

한편, 일 실시예의 이차 전지는 벤트 홀(24)에 설치되는 벤트 플레이트(25) 및 벤트 플레이트(25)의 내측에서 벤트 홀(24)에 설치되는 화염 제어 부재(26)를 더 포함한다.Meanwhile, the rechargeable battery of the exemplary embodiment further includes a vent plate 25 installed in the vent hole 24 and a flame control member 26 installed in the vent hole 24 inside the vent plate 25.

화염 제어 부재(26)는 이차 전지의 셀 이벤트시, 캡 플레이트(20)의 내측에서 외부로 분출되는 화염의 경로 길이를 제어하여, 벤트 홀(24)을 통하여 분출되는 화염을 최소화하도록 구성된다.The flame control member 26 is configured to control the path length of the flame ejected from the inside of the cap plate 20 to the outside during the cell event of the secondary battery, thereby minimizing the flame ejected through the vent hole 24.

벤트 플레이트(25)는 벤트 홀(24)을 밀폐하여 이차 전지의 내부 압력을 배출할 수 있도록 설치된다. 즉 내부 압력이 설정 압력에 이르면, 벤트 플레이트(25)가 절개되어 벤트 홀(24)을 개방한다. 벤트 플레이트(25)는 절개를 유도하는 노치(25a)를 가진다.The vent plate 25 is installed to seal the vent hole 24 to discharge the internal pressure of the secondary battery. That is, when the internal pressure reaches the set pressure, the vent plate 25 is cut open to open the vent hole 24. The vent plate 25 has a notch 25a for inducing an incision.

도 3은 도 2에서 캡 플레이트의 벤트 홀과 벤트 플레이트 및 제1, 제2화염 벤트 부재를 분해하여 도시한 분해 사시도이고, 도 4는 도 3의 Ⅳ-Ⅳ 선을 따라 자른 단면도이다.3 is an exploded perspective view illustrating the vent hole, the vent plate, and the first and second flame vent members of the cap plate in FIG. 2, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3.

도 3 및 도 4를 참조하면, 화염 제어 부재(26)는 벤트 홀(24)에서 캡 플레이트(20)의 두께 방향(z축 방향)을 따라 복수로 배치되어, 차단과 개방을 번갈아 형성하면서 분출되는 화염의 경로 길이를 증대시켜 화염의 분출을 최소화시킨다. 일례를 들면, 화염 제어 부재(26)는 2개로 형성되는 제1화염 벤트 부재(261)와 제2화염 벤트 부재(262)를 포함한다.3 and 4, the flame control member 26 is disposed in a plurality along the thickness direction (z-axis direction) of the cap plate 20 in the vent hole 24, and blows while alternately forming the blocking and opening. Increasing the path length of the flame is minimized to minimize flame ejection. For example, the flame control member 26 includes two first flame vent members 261 and a second flame vent member 262.

제1화염 벤트 부재(261)는 벤트 홀(24)에서 캡 플레이트(20)의 내표면에 대응하여 설치되어, 셀 이벤트로 발생된 화염을 1차로 제어한다. 즉 제1화염 벤트 부재(261)는 셀 이벤트로 발생된 화염을 부분적으로 차단하여 일부만 분출하도록 구성된다.The first flame vent member 261 is installed in the vent hole 24 to correspond to the inner surface of the cap plate 20 to primarily control the flame generated by the cell event. That is, the first flame vent member 261 is configured to partially block the flame generated by the cell event and to eject only a part of the flame.

제2화염 벤트 부재(262)는 벤트 홀(24)에서 제1화염 벤트 부재(261)와 제1간격(G1)으로 이격 설치되어, 제1화염 벤트 부재(261)를 경유한 화염을 2차로 제어한다. 즉 제2화염 벤트 부재(262)는 제1화염 벤트 부재(261)를 경유한 화염을 부분적으로 차단하여 일부만 분출하도록 구성된다.The second flame vent member 262 is installed at the vent hole 24 to be spaced apart from the first flame vent member 261 and the first interval G1, so that the flame passing through the first flame vent member 261 is secondarily. To control. That is, the second flame vent member 262 is configured to partially block the flame passing through the first flame vent member 261 and to eject only a part of the flame.

이때, 제1화염 벤트 부재(261)와 제2화염 벤트 부재(262)는 벤트 플레이트(25)의 평면(xy 평면)에 대하여 서로 어긋나는 분출 경로를 형성한다. 즉, 제1, 제2화염 벤트 부재(261, 262)는 부분적 분출과 부분적 차단을 제1간격(G1)을 유지하면서 서로 다른 측에 구비한다.At this time, the first flame vent member 261 and the second flame vent member 262 form a jet path that is shifted from each other with respect to the plane (xy plane) of the vent plate 25. That is, the first and second flame vent members 261 and 262 have partial blowout and partial shutoff on different sides while maintaining the first interval G1.

벤트 플레이트(25)는 벤트 홀(24)에서 제1화염 벤트 부재(261)와 제2간격(G2)으로 이격 설치된다. 이때, 벤트 플레이트(25)는 캡 플레이트(20)의 외표면에 대응하여 설치된다. 벤트 홀(24)의 캡 플레이트(20)의 두께 방향(z축 방향)에서, 제1, 제2화염 벤트 부재(261, 262)의 설치 범위가 확보될 수 있다.The vent plate 25 is spaced apart from the vent hole 24 by the first flame vent member 261 and the second gap G2. At this time, the vent plate 25 is installed corresponding to the outer surface of the cap plate 20. In the thickness direction (z-axis direction) of the cap plate 20 of the vent hole 24, an installation range of the first and second flame vent members 261 and 262 can be secured.

일례로써, 벤트 홀(24)은 제1단 홀(241), 제2단 홀(242) 및 제3단 홀(243)을 구비한다. 제1단 홀(241)은 캡 플레이트(20)의 내표면에 단차로 형성되어 제1화염 벤트 부재(261)의 용접을 지지한다. 제2단 홀(242)은 제1단 홀(241)에서 제1간격(G1)으로 이격되어 제2화염 벤트 부재(262)의 용접을 지지한다.As an example, the vent hole 24 includes a first end hole 241, a second end hole 242, and a third end hole 243. The first end hole 241 is formed in the inner surface of the cap plate 20 with a step to support the welding of the first flame vent member 261. The second end hole 242 is spaced apart from the first end hole 241 by the first interval G1 to support the welding of the second flame vent member 262.

제3단 홀(243)은 제2단 홀(242)에서 제2간격(G2)으로 이격되어 벤트 플레이트(25)의 용접을 지지한다. 제3단 홀(243)은 캡 플레이트(20)의 길이 방향(x축 방향)으로 설정되는 크기에서 제2단 홀(242)보다 크게 형성된다. 따라서 제2화염 벤트 부재(262)를 경유한 화염이 벤트 플레이트(25)의 전체 면적 영역에 작용하여 노치(25a)의 안정적인 절개를 가능하게 한다.The third end hole 243 is spaced apart from the second end hole 242 by the second interval G2 to support the welding of the vent plate 25. The third end hole 243 is formed larger than the second end hole 242 in the size set in the longitudinal direction (x-axis direction) of the cap plate 20. Therefore, the flame passing through the second flame vent member 262 acts on the entire area of the vent plate 25 to enable stable cutting of the notch 25a.

보다 구체적으로 설명하면, 제1화염 벤트 부재(261)는 제1차단부(263)와 제1개방부(264)를 포함한다. 제1차단부(263)는 캡 플레이트(20)의 길이 방향(x축 방향)의 제1측(좌측, 도 4 참조)에서 제1단 홀(241)을 부분적으로 차단한다. 제1개방부(264)는 길이 방향(x축 방향)의 제2측(우측, 도 4 참조)에서 제1차단부(263)에 연결되어 제1단 홀(241)을 부분적으로 개방한다. 제1개방부(264)는 복수의 홀들을 구비한다.In more detail, the first flame vent member 261 includes a first blocking portion 263 and a first opening portion 264. The first blocking portion 263 partially blocks the first end hole 241 at the first side (left side, FIG. 4) in the longitudinal direction (x-axis direction) of the cap plate 20. The first opening portion 264 is connected to the first blocking portion 263 at the second side (right side, FIG. 4) in the longitudinal direction (x-axis direction) to partially open the first end hole 241. The first opening part 264 has a plurality of holes.

제2화염 벤트 부재(262)는 제2차단부(265)와 제2개방부(266)를 포함한다. 제2차단부(265)는 제2측(우측, 도 4 참조)에서 제1개방부(264)에 대응하여 제2단 홀(242)을 부분적으로 차단한다. 제2개방부(266)는 제1측(좌측, 도 4 참조)에서 제1차단부(263)에 대응하여 제2단 홀(242)을 부분적으로 개방한다. 제2개방부(266)는 복수의 홀들을 구비한다.The second flame vent member 262 includes a second blocking portion 265 and a second opening portion 266. The second blocking part 265 partially blocks the second end hole 242 at the second side (right side, see FIG. 4) corresponding to the first opening part 264. The second open portion 266 partially opens the second end hole 242 at the first side (left side, see FIG. 4) corresponding to the first blocking portion 263. The second open part 266 includes a plurality of holes.

도 5는 도 4의 제1, 제2화염 벤트 부재에서 차단부와 개방부의 배치 관계를 도시한 평면도이다. 도 4 및 도 5를 참조하면, 제1화염 벤트 부재(261)에서 제1차단부(263)와 제1개방부(264) 사이에 제1경계선(B1)이 설정된다. 제1경계선(B1)은 길이 방향(x축 방향)의 중앙에서 제2측(우측, 도 4, 5 참조)으로 제1거리(L1)만큼 치우쳐 배치된다.FIG. 5 is a plan view illustrating an arrangement relationship between a blocking part and an opening part in the first and second flame vent members of FIG. 4. 4 and 5, a first boundary line B1 is set between the first blocking portion 263 and the first opening portion 264 in the first flame vent member 261. The first boundary line B1 is disposed to be offset by the first distance L1 from the center in the longitudinal direction (x-axis direction) to the second side (right side, see FIGS. 4 and 5).

제2화염 벤트 부재(262)에서 제2차단부(265)와 제2개방부(266) 사이에 제2경계선(B2)이 설정된다. 제2경계선(B2)은 길이 방향(x축 방향)의 중앙에서 제1측(우측, 도 4, 5 참조)으로 제2거리(L2)만큼 치우쳐 배치된다.In the second flame vent member 262, a second boundary line B2 is set between the second blocking portion 265 and the second opening portion 266. The second boundary line B2 is disposed to be biased by the second distance L2 from the center in the longitudinal direction (x-axis direction) to the first side (right side, see FIGS. 4 and 5).

즉 셀 이벤트로 내부에서 발생된 화염은 제1화염 벤트 부재(261)의 제1차단부(263)에 의하여 부분적으로 차단되고 제1개방부(264)를 통하여 분출된다. 제1화염 벤트 부재(261)의 제1개방부(264)로 분출되는 화염은 제1, 제2거리(L1, L2)의 합 거리(L1+L2)만큼 길이 방향(x축 방향)으로 이동된다. 이동된 화염은 제2화염 벤트 부재(262)의 제2차단부(265)에 의하여 부분적으로 차단되고 제2개방부(266)를 통하여 분출된다.That is, the flame generated inside the cell event is partially blocked by the first blocking portion 263 of the first flame vent member 261 and is ejected through the first opening portion 264. The flame ejected to the first open portion 264 of the first flame vent member 261 moves in the longitudinal direction (x-axis direction) by the sum distance L1 + L2 of the first and second distances L1 and L2. do. The moved flame is partially blocked by the second blocking portion 265 of the second flame vent member 262 and is ejected through the second open portion 266.

이때, 합 거리(L1+L2)에 의하여 분출되는 화염의 경로 길이가 길어진다. 따라서 화염은 제1, 제2차단부(263, 265)에서 많이 차단되고 제1, 제2개방부(264, 266)를 통하여, 절개된 벤트 플레이트(25)를 경유하여 일부만 외부로 분출될 수 있다. 이와 같이, 셀 이벤트시, 벤트 홀(24)을 통하여 화염(flame)의 외부 분출이 최소화 되어, 셀 안전성이 높아질 수 있다. At this time, the path length of the flame ejected by the sum distance L1 + L2 becomes long. Therefore, the flame is blocked at the first and second blocking portions 263 and 265 a lot, and the first and second openings 264 and 266 may be partially blown out through the cut vent plate 25. have. As such, when the cell event occurs, the external ejection of the flame through the vent hole 24 is minimized, thereby increasing the cell safety.

이하에서 본 발명의 제2실시예에 대하여 설명한다. 제1, 제2실시예를 비교하여, 서로 동일한 구성을 생략하고 서로 다른 구성에 대하여 설명한다.Hereinafter, a second embodiment of the present invention will be described. Comparing the first and second embodiments, the same configurations will be omitted, and different configurations will be described.

도 6은 본 발명의 제2실시예에 따른 이차 전지에서, 제1, 제2화염 벤트 부재에서 차단부와 개방부의 배치 관계를 도시한 평면도이다.FIG. 6 is a plan view illustrating an arrangement relationship between a blocking part and an opening part in the first and second flame vent members in the rechargeable battery according to the second exemplary embodiment of the present invention.

도 6을 참조하면, 본 발명의 제2실시예에 따른 이차 전지에서, 제1화염 벤트 부재(361)는 제1차단부(363)과 제1개방부(364)를 포함한다. 제1차단부(363)는 캡 플레이트(20)의 폭 방향(y축 방향)의 제1측(상측, 도 6 참조)에서 제1단 홀(241)(이하, 도 4 참조)을 부분적으로 차단한다. 제1개방부(364)는 폭 방향(y축 방향)의 제2측(하측, 도 6 참조)에서 제1차단부(363)에 연결되어 제1단 홀(241)을 부분적으로 개방한다.Referring to FIG. 6, in the rechargeable battery according to the second exemplary embodiment, the first flame vent member 361 includes a first blocking part 363 and a first opening part 364. The first blocking portion 363 partially recesses the first end hole 241 (see FIG. 4 below) on the first side (upper side, see FIG. 6) in the width direction (y-axis direction) of the cap plate 20. Block it. The first opening portion 364 is connected to the first blocking portion 363 at the second side (lower side, see FIG. 6) in the width direction (y-axis direction) to partially open the first end hole 241.

제2화염 벤트 부재(362)는 제2차단부(365)과 제2개방부(366)를 포함한다. 제2차단부(365)는 제2측(하측, 도 6 참조)에서 제1개방부(364)에 대응하여 제2단 홀(242)(이하, 도 4 참조)을 부분적으로 차단한다. 제2개방부(366)는 제1측(상측, 도 6 참조)에서 제1차단부(363)에 대응하여 제2단 홀(242)을 부분적으로 개방한다.The second flame vent member 362 includes a second blocking portion 365 and a second opening portion 366. The second blocking part 365 partially blocks the second end hole 242 (see FIG. 4) in response to the first opening part 364 at the second side (lower side, see FIG. 6). The second open portion 366 partially opens the second end hole 242 at the first side (upper side, see FIG. 6) corresponding to the first blocking portion 363.

제1화염 벤트 부재(361)에서 제1차단부(363)와 제1개방부(364) 사이에 제21경계선(B21)이 설정된다. 제21경계선(B21)은 폭 방향(y축 방향)의 중앙에서 제2측(하측, 도 6 참조)으로 제21거리(L21)만큼 치우쳐 배치된다.The twenty-first boundary line B21 is set between the first blocking portion 363 and the first opening portion 364 in the first flame vent member 361. The twenty-first boundary line B21 is disposed to be offset by the twenty-first distance L21 from the center in the width direction (y-axis direction) to the second side (lower side, see FIG. 6).

제2화염 벤트 부재(362)에서 제2차단부(365)와 제2개방부(366) 사이에 제22경계선(B22)이 설정된다. 제22경계선(B22)은 폭 방향(y축 방향)의 중앙에서 제1측(상측, 도 6 참조)으로 제22거리(L22)만큼 치우쳐 배치된다.In the second flame vent member 362, the twenty-second boundary line B22 is set between the second blocking portion 365 and the second opening portion 366. The twenty-second boundary line B22 is disposed to be offset by the twenty-second distance L22 from the center in the width direction (y-axis direction) to the first side (upper side, see FIG. 6).

즉 셀 이벤트로 내부에서 발생된 화염은 제1화염 벤트 부재(361)의 제1차단부(363)에 의하여 부분적으로 차단되고 제1개방부(364)를 통하여 분출된다. 제1화염 벤트 부재(361)의 제1개방부(364)로 분출되는 화염은 제21, 제22거리(L21, L22)의 합 거리(L21+L22)만큼 폭 방향(y축 방향)으로 이동된다. 이동된 화염은 제2화염 벤트 부재(362)의 제2차단부(365)에 의하여 부분적으로 차단되고 제2개방부(366)를 통하여 분출된다.That is, the flame generated inside the cell event is partially blocked by the first blocking portion 363 of the first flame vent member 361 and is ejected through the first opening 364. The flame ejected to the first open portion 364 of the first flame vent member 361 moves in the width direction (y-axis direction) by the sum distance L21 + L22 of the twenty-first and twenty-second distances L21 and L22. do. The moved flame is partially blocked by the second blocking portion 365 of the second flame vent member 362 and is ejected through the second open portion 366.

이때, 합 거리(L21+L22)에 의하여 분출되는 화염의 경로 길이가 길어진다. 따라서 화염은 제1, 제2차단부(363, 365)에서 많이 차단되고, 제1, 제2개방부(364, 366)를 총하여, 절개된 벤트 플레이트(25)(도 4 참조)를 경유하여 일부만 외부로 분출될 수 있다. 이와 같이, 셀 이벤트시, 벤트 홀(24)(도 4 참조)을 통하여 화염(flame)의 외부 분출이 최소화 되어, 셀 안전성이 높아질 수 있다. At this time, the path length of the flame ejected by the sum distance L21 + L22 becomes long. Therefore, the flame is largely blocked at the first and second blocking parts 363 and 365, and the first and second opening parts 364 and 366 are combined to pass through the cut vent plate 25 (see FIG. 4). Only part of it can be ejected to the outside. As such, during the cell event, external blowout of the flame through the vent hole 24 (see FIG. 4) is minimized, thereby increasing cell safety.

이상을 통해 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것이 아니고 특허청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시하는 것이 가능하고 이 또한 본 발명의 범위에 속하는 것은 당연하다.Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

- 부호의 설명 -Description of the sign

10: 전극 조립체 11: 제1전극(음극)10: electrode assembly 11: first electrode (cathode)

11a, 12a: 코팅부 11b, 12b: 무지부11a, 12a: coating part 11b, 12b: plain part

12: 제2전극(양극) 13: 세퍼레이터12: second electrode (anode) 13: separator

15: 케이스 20: 캡 플레이트15: case 20: cap plate

21: 제1전극단자(음극 단자) 22: 제2전극단자(양극 단자)21: first electrode terminal (cathode terminal) 22: second electrode terminal (anode terminal)

21a, 22a: 리벳 터미널 21b, 22b: 플랜지21a, 22a: rivet terminal 21b, 22b: flange

21c, 22c: 플레이트 터미널 24: 벤트 홀21c, 22c: plate terminal 24: vent hole

25: 벤트 플레이트 26: 화염 제어 부재25: vent plate 26: flame control member

27: 밀봉 마개 29: 전해액 주입구27: sealing plug 29: electrolyte inlet

31: 절연부재 36, 37: 음, 양극 개스킷31: insulation member 36, 37: negative and positive gasket

40: 외부 단락부 41: 단락 탭40: external short circuit 41: short tab

42: 단락 홀 43: 단락부재42: short circuit hole 43: short circuit member

46: 탑 플레이트 51, 52: 음, 양극 리드 탭46: top plate 51, 52: um, positive lead tab

61, 62: 음, 양극 절연부재 241: 제1단 홀61, 62: negative and positive electrode insulating member 241: first stage hole

242: 제2단 홀 243: 제3단 홀242: second stage hole 243: third stage hole

261, 361: 제1화염 벤트 부재 262, 362: 제2화염 벤트 부재261, 361: first flame vent member 262, 362: second flame vent member

263, 363: 제1차단부 264, 364: 제1개방부263, 363: first blocking portion 264, 364: first opening portion

265, 365: 제2차단부 266, 366: 제2개방부265, 365: 2nd blocking part 266, 366: 2nd opening part

B1, B21: 제1, 제21경계선 B2, B22: 제2, 제22경계선B1 and B21: First and 21st boundary lines B2 and B22: Second and 22nd boundary lines

G1, G2: 제1, 제2간격 H1, H2: 단자홀G1, G2: first and second intervals H1, H2: terminal hole

L1, L21: 제1, 제21거리 L2, L22: 제2, 제22거리L1, L21: 1st, 21st distance L2, L22: 2nd, 22nd distance

Claims (17)

전류를 충전 및 방전하는 전극 조립체;An electrode assembly for charging and discharging current; 상기 전극 조립체를 수용하는 케이스;A case accommodating the electrode assembly; 상기 케이스의 개구에 결합되는 캡 플레이트;A cap plate coupled to the opening of the case; 상기 전극 조립체에 전기적으로 연결되어 상기 캡 플레이트를 통하여 외부로 인출되는 전극단자;An electrode terminal electrically connected to the electrode assembly and drawn out to the outside through the cap plate; 상기 캡 플레이트의 벤트 홀에 설치되는 벤트 플레이트; 및A vent plate installed in the vent hole of the cap plate; And 상기 벤트 플레이트의 내측에서 상기 벤트 홀에 설치되어 상기 캡 플레이트의 내측에서 외부로 분출되는 화염의 경로 길이를 제어하는 화염 제어 부재A flame control member installed in the vent hole at the inside of the vent plate to control a path length of the flame ejected from the inside of the cap plate to the outside; 를 포함하는 이차 전지.Secondary battery comprising a. 제1항에 있어서,The method of claim 1, 상기 화염 제어 부재는,The flame control member, 상기 벤트 홀에서 상기 캡 플레이트의 내표면에 대응하여 설치되어 부분적으로 화염을 분출하는 제1화염 벤트 부재, 및A first flame vent member installed corresponding to the inner surface of the cap plate at the vent hole to partially eject the flame; and 상기 벤트 홀에서 상기 제1화염 벤트 부재와 제1간격으로 이격 설치되어 부분적으로 화염을 분출하는 제2화염 벤트 부재A second flame vent member which is spaced apart from the first flame vent member at a first interval in the vent hole to partially eject the flame; 를 포함하는 이차 전지.Secondary battery comprising a. 제2항에 있어서,The method of claim 2, 상기 제1화염 벤트 부재와 상기 제2화염 벤트 부재는The first flame vent member and the second flame vent member 상기 벤트 플레이트의 평면에 대하여 서로 어긋나는 분출 경로를 형성하는 이차 전지.A secondary battery for forming a blowing path that is shifted with respect to the plane of the vent plate. 제2항에 있어서,The method of claim 2, 상기 벤트 플레이트는The vent plate is 상기 벤트 홀에서 상기 제1화염 벤트 부재와 제2간격으로 이격 설치되는 이차 전지.The secondary battery is spaced apart from the first flame vent member and a second interval in the vent hole. 제4항에 있어서,The method of claim 4, wherein 상기 벤트 플레이트는The vent plate is 상기 캡 플레이트의 외표면에 대응하여 설치되는 이차 전지.The secondary battery is installed corresponding to the outer surface of the cap plate. 제2항에 있어서,The method of claim 2, 상기 벤트 홀은The vent hole is 상기 캡 플레이트의 내표면에 단차로 형성되어 상기 제1화염 벤트 부재를 용접 지지하는 제1단 홀, 및A first end hole formed at an inner surface of the cap plate at a step to weld and support the first flame vent member, and 상기 제1단 홀에서 상기 제1간격으로 이격되어 상기 제2화염 벤트 부재를 용접 지지하는 제2단 홀을 포함하는 이차 전지.And a second end hole spaced apart from the first end hole by the first interval to weld weld the second flame vent member. 제6항에 있어서,The method of claim 6, 상기 벤트 홀은The vent hole is 상기 제2단 홀에서 상기 제2간격으로 이격되어 상기 벤트 플레이트를 용접 지지하는 제3단 홀을 더 포함하는 이차 전지.And a third end hole spaced apart from the second end hole by the second interval to support the vent plate by welding. 제7항에 있어서,The method of claim 7, wherein 상기 제3단 홀은 The third stage hole 상기 캡 플레이트의 길이 방향으로 설정되는 크기에서 상기 제2단 홀보다 크게 형성되는 이차 전지.The secondary battery is formed larger than the second end hole in the size set in the longitudinal direction of the cap plate. 제6항에 있어서,The method of claim 6, 상기 제1화염 벤트 부재는The first flame vent member 상기 캡 플레이트의 길이 방향의 제1측에서 상기 제1단 홀을 부분적으로 차단하는 제1차단부, 및 A first blocking portion that partially blocks the first end hole on the first side in the longitudinal direction of the cap plate, and 상기 길이 방향의 제2측에서 상기 제1차단부에 연결되어 상기 제1단 홀을 부분적으로 개방하는 제1개방부를 포함하는 이차 전지.And a first opening portion connected to the first blocking portion at the second side in the longitudinal direction to partially open the first opening. 제9항에 있어서,The method of claim 9, 상기 제2화염 벤트 부재는The second flame vent member 상기 제2측에서 상기 제1개방부에 대응하여 상기 제2단 홀을 부분적으로 차단하는 제2차단부, 및A second blocking portion that partially blocks the second end hole corresponding to the first opening portion at the second side; and 상기 제1측에서 상기 제1차단부에 대응하여 상기 제2단 홀을 부분적으로 개방하는 제2개방부를 포함하는 이차 전지.And a second opening part partially opening the second end hole in correspondence with the first blocking part at the first side. 제10항에 있어서,The method of claim 10, 상기 제1화염 벤트 부재에서 상기 제1차단부와 상기 제1개방부 사이에 설정되는 제1경계선은 A first boundary line set between the first blocking portion and the first opening portion in the first flame vent member is 상기 길이 방향의 중앙에서 상기 제2측으로 제1거리만큼 치우쳐 배치되는 이차 전지.A secondary battery disposed to be biased by the first distance from the center in the longitudinal direction to the second side. 제11항에 있어서,The method of claim 11, 상기 제2화염 벤트 부재에서 상기 제2차단부와 상기 제2개방부 사이에 설정되는 제2경계선은 In the second flame vent member, a second boundary line set between the second blocking portion and the second opening portion is 상기 길이 방향의 중앙에서 상기 제1측으로 제2거리만큼 치우쳐 배치되는 이차 전지.A secondary battery disposed to be biased by a second distance from the center in the longitudinal direction to the first side. 제10항에 있어서,The method of claim 10, 상기 제1개방부 및 상기 제2개방부는 복수의 홀들을 구비하는 이차 전지.The first open part and the second open part includes a plurality of holes. 제6항에 있어서,The method of claim 6, 상기 제1화염 벤트 부재는The first flame vent member 상기 캡 플레이트의 폭 방향의 제1측에서 상기 제1단 홀을 부분적으로 차단하는 제1차단부, 및 A first blocking portion that partially blocks the first end hole on the first side in the width direction of the cap plate, and 상기 폭 방향의 제2측에서 상기 제1차단부에 연결되어 상기 제1단 홀을 부분적으로 개방하는 제1개방부를 포함하는 이차 전지.And a first opening portion connected to the first blocking portion at the second side in the width direction to partially open the first opening. 제14항에 있어서,The method of claim 14, 상기 제2화염 벤트 부재는The second flame vent member 상기 제2측에서 상기 제1개방부에 대응하여 상기 제2단 홀을 부분적으로 차단하는 제2차단부, 및A second blocking portion that partially blocks the second end hole corresponding to the first opening portion at the second side; and 상기 제1측에서 상기 제1차단부에 대응하여 상기 제2단 홀을 부분적으로 개방하는 제2개방부를 포함하는 이차 전지.And a second opening part partially opening the second end hole in correspondence with the first blocking part at the first side. 제15항에 있어서,The method of claim 15, 상기 제1화염 벤트 부재에서 상기 제1차단부와 상기 제1개방부 사이에 설정되는 제21경계선은 A twenty-first boundary line set between the first blocking portion and the first opening portion in the first flame vent member is 상기 폭 방향의 중앙에서 상기 제2측으로 제21거리만큼 치우쳐 배치되는 이차 전지.A secondary battery disposed to be biased toward the second side from the center in the width direction by a 21st distance. 제16항에 있어서,The method of claim 16, 상기 제2화염 벤트 부재에서 상기 제2차단부와 상기 제2개방부 사이에 설정되는 제22경계선은 A twenty-second boundary line set between the second blocking portion and the second opening portion in the second flame vent member is 상기 폭 방향의 중앙에서 상기 제1측으로 제22거리만큼 치우쳐 배치되는 이차 전지.A secondary battery disposed to be biased toward the first side from the center in the width direction by a 22nd distance.
PCT/KR2017/006562 2016-08-31 2017-06-22 Secondary battery Ceased WO2018043889A1 (en)

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