KR102331724B1 - Method for Manufacturing Secondary Battery - Google Patents

Method for Manufacturing Secondary Battery Download PDF

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KR102331724B1
KR102331724B1 KR1020150014461A KR20150014461A KR102331724B1 KR 102331724 B1 KR102331724 B1 KR 102331724B1 KR 1020150014461 A KR1020150014461 A KR 1020150014461A KR 20150014461 A KR20150014461 A KR 20150014461A KR 102331724 B1 KR102331724 B1 KR 102331724B1
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South Korea
Prior art keywords
welding
electrode
secondary battery
manufacturing
electrode tabs
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KR1020150014461A
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Korean (ko)
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KR20160093447A (en
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김기웅
류상현
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삼성에스디아이 주식회사
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Priority to KR1020150014461A priority Critical patent/KR102331724B1/en
Priority to CN201510204867.3A priority patent/CN106159308B/en
Publication of KR20160093447A publication Critical patent/KR20160093447A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/354—Working by laser beam, e.g. welding, cutting or boring for surface treatment by melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/0426—Fixtures for other work
    • B23K37/0435—Clamps
    • B23K37/0443—Jigs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/049—Processes for forming or storing electrodes in the battery container
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
    • B23K2103/54—Glass
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Plasma & Fusion (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

본 발명은 안전성이 향상된 이차전지의 제조방법에 관한 것으로, 제1 및 제2 전극탭이 구비된 전극조립체를 케이스의 수용부에 삽입하는 단계, 상기 전극조립체가 수용된 케이스의 수용부에 전해액을 주입하고 실링부를 열융착하여 실링하는 단계, 및 상기 제1 및 제2 전극탭과 보호회로모듈을 용접하는 단계를 포함하고, 상기 용접하는 단계에서 용접은 지그에 의해 이루어지되, 상기 지그와 상기 제1 및 제2 전극탭과 접촉되는 영역에는 용접 부재가 구비되는 구성을 마련한다.
상기와 같은 이차전지의 제조방법을 이용하는 것에 의해, 용접시 발생될 수 있는 누전 및 단락의 위험을 사전에 예방할 수 있으므로 전지의 안전성을 향상시킬 수 있다.
The present invention relates to a method for manufacturing a secondary battery with improved safety, comprising the steps of inserting an electrode assembly having first and second electrode tabs into a receiving portion of a case, and injecting an electrolyte into the receiving portion of the case in which the electrode assembly is accommodated and sealing the sealing part by thermal fusion, and welding the first and second electrode tabs and the protective circuit module, wherein in the welding step, welding is performed by a jig, the jig and the first and a welding member is provided in a region in contact with the second electrode tab.
By using the manufacturing method of the secondary battery as described above, it is possible to prevent in advance the risk of electric leakage and short circuit that may occur during welding, so that the safety of the battery can be improved.

Description

이차전지의 제조방법 {Method for Manufacturing Secondary Battery}Secondary battery manufacturing method {Method for Manufacturing Secondary Battery}

본 발명은 이차전지의 제조방법에 관한 것으로서, 보다 구체적으로는 전극탭과 보호회로모듈의 전극리드 간에 안전성이 향상된 이차전지의 제조방법에 관한 것이다.
The present invention relates to a method for manufacturing a secondary battery, and more particularly, to a method for manufacturing a secondary battery with improved safety between an electrode tab and an electrode lead of a protection circuit module.

통상, 이차전지는 복수회의 충방전이 가능한 전지로, 최근 전기, 전자, 통신 및 컴퓨터 등의 산업이 발달함에 따라 휴대용 기기의 전원으로 채용이 용이한 이차전지에 대한 수요가 증가하고 있다. 이차전지는 그 사용형태 및 사용량이 증가할수록 성능 및 안전성을 향상시키기 위하여 다양한 방면으로 연구가 진행되고 있다. In general, a secondary battery is a battery that can be charged and discharged multiple times, and as industries such as electricity, electronics, communication, and computer develop in recent years, the demand for a secondary battery that can be easily used as a power source for portable devices is increasing. Secondary batteries are being studied in various fields in order to improve their performance and safety as their usage patterns and usage increase.

이와 같이, 이차전지의 수요가 증가할수록 상기 이차전지의 제조공정을 효율적으로 수행하기 위하여 다양한 방면으로 연구되고 있다. 반면, 이차전지를 구성하는 리튬화합물의 반응성이 매우 크고, 동시에 단락 등의 위험이 있기 때문에 이차전지를 제조하는 공정에 대하여 변화가 쉽지 않은 실정이다. 따라서, 이차전지의 안전성 및 신뢰성을 그대로 유지하면서, 이차전지의 제조 공정을 단순화하여 생산성을 향상시키기 위하여 다양한 연구가 진행되고 있다.
As such, as the demand for secondary batteries increases, research is being conducted in various fields in order to efficiently perform the manufacturing process of the secondary batteries. On the other hand, since the reactivity of the lithium compound constituting the secondary battery is very high and there is a risk of a short circuit at the same time, it is difficult to change the process of manufacturing the secondary battery. Accordingly, various studies are being conducted to improve productivity by simplifying the manufacturing process of the secondary battery while maintaining the safety and reliability of the secondary battery.

본 발명은 전극조립체에서 전극탭과 보호회로모듈의 전극리드 간을 용접시, 전극탭과 지그 사이에 용접 부재를 두고 레이저 용접을 수행함에 의해 누전의 발생을 방지할 수 있어 안전성을 향상할 수 있는 이차전지의 제조방법을 제공하는 것을 목적으로 한다.
In the present invention, when welding between an electrode tab and an electrode lead of a protective circuit module in an electrode assembly, by performing laser welding with a welding member between the electrode tab and the jig, it is possible to prevent the occurrence of a short circuit, thereby improving safety. An object of the present invention is to provide a method for manufacturing a secondary battery.

상기 목적을 달성하기 위해 본 발명에 따른 이차전지의 제조방법은 제1 및 제2 전극탭이 구비된 전극조립체를 케이스의 수용부에 삽입하는 단계, 상기 전극조립체가 수용된 케이스의 수용부에 전해액을 주입하고 실링부를 열융착하여 실링하는 단계, 및 상기 제1 및 제2 전극탭과 보호회로모듈을 용접하는 단계를 포함하고, 상기 용접하는 단계에서 용접은 지그에 의해 이루어지되, 상기 지그와 상기 제1 및 제2 전극탭과 접촉되는 영역에는 용접 부재가 구비될 수 있다.In order to achieve the above object, the method of manufacturing a secondary battery according to the present invention includes the steps of inserting an electrode assembly having first and second electrode tabs into a receiving portion of a case, and injecting an electrolyte into the receiving portion of the case in which the electrode assembly is accommodated. and sealing the sealing portion by injecting and heat-sealing the sealing portion, and welding the first and second electrode tabs and the protective circuit module, wherein in the welding step, welding is performed by a jig, the jig and the first A welding member may be provided in a region in contact with the first and second electrode tabs.

또 상기 지그는 상기 제1 및 제2 전극탭에 각각 간접 접촉하는 제1 및 제2 용접부를 포함하고, 상기 제1 및 제2 용접부는 제1 및 제2 전극탭과 대응되게 형성될 수 있다.Also, the jig may include first and second welding portions indirectly contacting the first and second electrode tabs, respectively, and the first and second welding portions may be formed to correspond to the first and second electrode tabs.

또 상기 제1 및 제2 용접부 간의 거리는 제1 및 제2 전극탭 간의 거리와 대응될 수 있다.Also, a distance between the first and second welding portions may correspond to a distance between the first and second electrode tabs.

또 상기 용접 부재는 제1 및 제2 전극탭과 각각 대응되게 형성되는 제1 및 제2 용접 부재를 포함하고, 상기 제1 및 제2 용접 부재는 상기 지그의 제1 및 제2 용접부에 각각 결합될 수 있다.In addition, the welding member includes first and second welding members formed to correspond to the first and second electrode tabs, respectively, and the first and second welding members are respectively coupled to the first and second welding portions of the jig. can be

또 상기 용접은 레이저에 의해 수행될 수 있다.In addition, the welding may be performed by a laser.

또 상기 용접 부재는 열전도성 부재일 수 있다.In addition, the welding member may be a thermally conductive member.

또 상기 열전도성 부재는 납보다 더 높은 녹는점을 갖을 수 있다.In addition, the thermally conductive member may have a higher melting point than lead.

또한, 상기 용접 부재는 유리일 수 있다.
In addition, the welding member may be glass.

상술한 바와 같이, 본 발명에 따른 이차전지의 제조방법에 의하면, 전극탭과 전극리드 간을 용접시 전극탭과 지그 사이에 별도의 용접 부재를 구비함으로써 용접시 발생될 수 있는 누전 및 단락의 위험을 사전에 예방할 수 있으므로 전지의 안전성을 향상시킬 수 있다.As described above, according to the method for manufacturing a secondary battery according to the present invention, when a separate welding member is provided between the electrode tab and the jig when welding the electrode tab and the electrode lead, there is a risk of electric leakage and short circuit that may occur during welding. can be prevented in advance, so the safety of the battery can be improved.

본 발명에 따른 이차전지의 제조방법에 의하면, 용접 부재가 오직 제1 및 제2 연결탭에만 직접적으로 접촉할 수 있도록 구비됨에 의해 용접이 용이하고 작업효율을 향상시킬 수 있다.
According to the method of manufacturing a secondary battery according to the present invention, since the welding member is provided to directly contact only the first and second connection tabs, welding is easy and work efficiency can be improved.

도 1은 전극조립체가 케이스에 삽입되는 상태를 보여주는 사시도,
도 2는 전극조립체가 케이스에 삽입된 후, 실링부가 실링된 상태를 보여주는 사시도,
도 3은 용접하는 상태를 보여주는 사시도,
도 4는 도3의 용접시 상태를 보여주는 단면도.1 is a perspective view showing a state in which an electrode assembly is inserted into a case;
2 is a perspective view showing a state in which the sealing part is sealed after the electrode assembly is inserted into the case;
3 is a perspective view showing a welding state;
Figure 4 is a cross-sectional view showing a state during welding of Figure 3;

이하에서는 본 발명에 대하여 첨부된 도면에 도시된 실시 예에 따라 구체적으로 설명하기는 하나, 본 발명이 도시된 실시 예만으로 한정되는 것은 아니다.Hereinafter, the present invention will be described in detail according to the embodiments shown in the accompanying drawings, but the present invention is not limited to the illustrated embodiments.

본 발명의 상기 및 그 밖의 목적과 새로운 특징은 본 명세서의 기술 및 첨부 도면에 의해 더욱 명확하게 될 것이다.
The above and other objects and novel features of the present invention will become more apparent from the description of the present specification and accompanying drawings.

이하, 본 발명에 따른 이차전지의 제조방법을 도면에 따라서 설명한다.Hereinafter, a method of manufacturing a secondary battery according to the present invention will be described with reference to the drawings.

도 1 내지 도 4는 본 발명의 일 실시예에 따른 이차전지의 제조방법을 설명하기 위한 도면들이다. 도 1은 전극조립체가 케이스에 삽입되는 상태를 보여주는 사시도이고, 도 2는 전극조립체가 케이스에 삽입된 후, 실링부가 실링된 상태를 보여주는 사시도이며, 도 3은 용접하는 상태를 보여주는 사시도이고, 도 4는 도 3의 용접시 상태를 보여주는 단면도이다. 1 to 4 are views for explaining a method of manufacturing a secondary battery according to an embodiment of the present invention. 1 is a perspective view showing a state in which an electrode assembly is inserted into a case, FIG. 2 is a perspective view showing a state in which the sealing part is sealed after the electrode assembly is inserted into the case, and FIG. 3 is a perspective view showing a state of welding, FIG. 4 is a cross-sectional view showing the welding state of FIG. 3 .

도 1을 참조하면, 먼저 제1 및 제2 전극탭(111a, 111b)이 구비된 전극조립체(110)를 케이스(120)의 수용부(123)에 삽입한다. Referring to FIG. 1 , first, the electrode assembly 110 provided with the first and second electrode tabs 111a and 111b is inserted into the receiving part 123 of the case 120 .

상기 전극조립체(110)는 서로 적층된 제1 및 제2 극판(111, 112)과 세퍼레이터(113)를 권취하여 젤리롤(Jelly Roll) 형태로 제조하거나, 또는 복수개의 제1 및 제2 극판(111, 112)과 세퍼레이터(113)를 적층하여 스택(stack)형태로 제조하거나, 또는 권취 및 적층 양측 모두를 사용하여 제조할 수 있다. The electrode assembly 110 is manufactured in the form of a jelly roll by winding the first and second electrode plates 111 and 112 and the separator 113 stacked on each other, or a plurality of first and second electrode plates ( 111 and 112 and the separator 113 may be laminated to form a stack, or may be manufactured using both winding and lamination.

제1 극판(111)은 시트형태의 도전물질인 제1 기재에 제1 활물질을 간헐적으로 코팅하여 형성된 제1 활물질코팅부, 상기 제1 활물질이 코팅되지 않아 상기 제1 기재가 노출되는 부분인 제1 무지부로 이루어지고, 제1 전극탭(111a)은 상기 제1 무지부의 일측에 전기적으로 연결되어 제1 무지부의 일측으로 돌출되게 구비될 수 있다. 예컨대, 제1 극판(111)은 음극판일 수 있고, 상기 제1 활물질은 결정질 탄소, 비정질 탄소, 탄소 복합체, 탄소 섬유 등의 탄소 재료, 리튬 금속 또는 리튬 합금을 포함하는 음극 활물질일 수 있다. 또한, 제1 전극탭(111a)의 일 영역에는 제1 필름부(114a)가 구비될 수 있다.The first electrode plate 111 is a first active material coating portion formed by intermittently coating a first active material on a first substrate, which is a sheet-shaped conductive material, and a portion where the first substrate is exposed because the first active material is not coated. One uncoated region may be formed, and the first electrode tab 111a may be electrically connected to one side of the first uncoated region to protrude toward one side of the first uncoated region. For example, the first electrode plate 111 may be a negative electrode plate, and the first active material may be a negative electrode active material including a carbon material such as crystalline carbon, amorphous carbon, carbon composite, carbon fiber, lithium metal, or a lithium alloy. In addition, a first film part 114a may be provided in one region of the first electrode tab 111a.

제2 극판(112)은 상기 제1 극판(111)과 다른 극성을 갖는 것으로, 시트형태의 도전물질인 제2 기재에 제2 활물질을 간헐적으로 코팅하여 형성된 제2 활물질코팅부, 상기 제2 활물질이 코팅되지 않아 상기 제2 기재가 노출되는 부분인 제2 무지부로 이루어지고, 제2 전극탭(112a)은 상기 제2 무지부의 일측에 전기적으로 연결되어 제2 무지부의 일측으로 돌출되게 구비될 수 있다. 예컨대, 상기 제2 극판(112)은 양극판을 포함하고, 상기 제2 활물질은 LiCoO2, LiNiO2, LiMnO2, LiMn2O4 또는 LiNi1 -x- yCoxMyO2등의 리튬을 포함하는 양극 활물질로 이루어질 수 있다. 또한, 제2 전극탭(112a)의 일 영역에는 제2 필름부(114a)가 구비될 수 있다.The second electrode plate 112 has a polarity different from that of the first electrode plate 111, and includes a second active material coating portion formed by intermittently coating a second active material on a second substrate, which is a sheet-shaped conductive material, and the second active material. The second uncoated portion may be formed of a second uncoated portion that is not coated and the second uncoated portion is exposed, and the second electrode tab 112a may be electrically connected to one side of the second uncoated portion to protrude toward one side of the second uncoated portion. have. For example, the lithium, such as the second electrode plate 112 includes a positive electrode plate, and the second active material is LiCoO 2, LiNiO 2, LiMnO 2 , LiMn 2 O 4 or LiNi 1 -x- y Co x M y O 2 It may be made of a positive electrode active material including. In addition, a second film part 114a may be provided in one region of the second electrode tab 112a.

세퍼레이터(113)는 상기 제1 극판(111)과 제2 극판(112) 사이에 위치되어 권취되며, 제1 극판(111) 및 제2 극판(112) 사이를 상호 절연시킨다. 그리고, 세퍼레이터(113)는 제1 극판(111)과 제2 극판(112) 간에 리튬이온이 교환될 수 있다. 이러한 세퍼레이터(113)는 전극조립체(110)가 수축 및 팽창되더라도 제1 극판(111)과 제2 극판(112) 사이를 완전히 절연할 수 있도록 충분한 길이로 이루어지는 것이 바람직하다. The separator 113 is positioned and wound between the first electrode plate 111 and the second electrode plate 112 , and insulates between the first electrode plate 111 and the second electrode plate 112 . In addition, in the separator 113 , lithium ions may be exchanged between the first electrode plate 111 and the second electrode plate 112 . The separator 113 preferably has a length sufficient to completely insulate between the first electrode plate 111 and the second electrode plate 112 even when the electrode assembly 110 contracts and expands.

케이스(120)는 전극조립체(110)를 수용하는 부재로서 상부 및 하부 케이스(121, 122)로 형성되고, 하부 케이스(122)에는 전극조립체(110) 및 전해액을 수용하는 수용부(123)가 형성되며, 상부 및 하부 케이스(121, 122)는 하부 케이스(122)의 외곽에 형성된 실링부(124)에 의해 상호 결합될 수 있다. 도 1에서는 상기 케이스(120)를 파우치형으로 도시하고 있으나, 이에 한정되는 것은 아니고, 원통형, 직육면체 및 코인형 등으로 제작가능하다.
The case 120 is a member for accommodating the electrode assembly 110, and is formed of upper and lower cases 121 and 122, and the lower case 122 has an electrode assembly 110 and an accommodating part 123 for accommodating the electrolyte. is formed, and the upper and lower cases 121 and 122 may be coupled to each other by a sealing portion 124 formed outside the lower case 122 . Although the case 120 is illustrated in FIG. 1 as a pouch type, it is not limited thereto, and it can be manufactured in a cylindrical shape, a rectangular parallelepiped shape, and a coin shape.

다음에 상기 전극조립체(110)가 수용된 하부 케이스(121)의 수용부(123)에 전해액을 주입하고, 도 2에 도시된 바와 같이, 실링부(124)를 열융착하여 실링한다. Next, an electrolyte is injected into the receiving part 123 of the lower case 121 in which the electrode assembly 110 is accommodated, and as shown in FIG. 2 , the sealing part 124 is heat-sealed to seal it.

상기 제1 및 제2 전극탭(111a, 111b)은 실링부(124)의 일 영역을 통하여 외부로 인출되는데, 이때, 제1 및 제2 전극탭(111a, 111b)이 실링부(124)의 끝단에서 노출되는 금속층과 접하게 되면 단락이 발생될 수 있다. 그러므로 하부 케이스(123)의 실링부(124)에 제1 및 제2 전극탭(111a, 111b)의 제1 및 제2 필름부(114a, 114b)가 안착되도록 위치시킨 후, 열융착을 실시하는 것이 바람직하다. 또한, 제1 및 제2 필름부(114a, 114b)는 실링부(124)와 유사한 물질로 이루어져 실링부(124)가 열융착될 때 제1 및 제2 전극탭(111a, 111b)과 실링부(124)가 더욱 긴밀하게 밀착될 수 있도록 촉매 역할을 할 수 있다.
The first and second electrode tabs 111a and 111b are drawn out through one region of the sealing part 124 , and in this case, the first and second electrode tabs 111a and 111b are connected to the sealing part 124 . A short circuit may occur if it comes into contact with the metal layer exposed at the tip. Therefore, after positioning the first and second film portions 114a and 114b of the first and second electrode tabs 111a and 111b to be seated on the sealing portion 124 of the lower case 123, thermal fusion is performed. it is preferable In addition, the first and second film portions 114a and 114b are made of a material similar to that of the sealing portion 124 , and when the sealing portion 124 is thermally fused, the first and second electrode tabs 111a and 111b and the sealing portion (124) may act as a catalyst to be more closely adhered.

그 후, 보호회로모듈(130)과 제1 및 제2 전극탭(111a, 111b)을 용접한다. 상세하게는, 도 3에 도시된 바와 같이, 보호회로모듈(130)의 제1 및 제2 전극리드(131a, 131b)의 상부면에 제1 및 제2 전극탭(111a, 111b)을 위치시킨 후, 지그(140)를 이용하여 용접한다. 이때, 제1 및 제2 전극탭(111a, 111b)과 지그(140)가 접촉되는 영역에는 용접 부재(150)가 더 구비될 수 있다. Thereafter, the protection circuit module 130 and the first and second electrode tabs 111a and 111b are welded. In detail, as shown in FIG. 3 , the first and second electrode tabs 111a and 111b are positioned on the upper surfaces of the first and second electrode leads 131a and 131b of the protection circuit module 130 . Then, welding is performed using a jig 140 . In this case, a welding member 150 may be further provided in a region where the first and second electrode tabs 111a and 111b and the jig 140 contact each other.

예컨대, 상기 제1 및 제2 전극탭(111a, 111b), 제1 및 제2 전극리드(151, 152), 용접 부재(150), 지그(140)는 각각 수직 방향으로 같은 선상에 위치되어 레이저에 의해 용접이 수행됨으로써 전기적으로 연결된다. For example, the first and second electrode tabs 111a and 111b, the first and second electrode leads 151 and 152 , the welding member 150 , and the jig 140 are positioned on the same line in the vertical direction, respectively. It is electrically connected by welding.

상기 지그(140)는 제1 및 제2 전극탭(111a, 111b)에 각각 간접 접촉하는 제1 및 제2 용접부(151a, 151b)를 포함하고, 상기 제1 및 제2 용접부(151a, 151b)는 제1 및 제2 전극탭(111a, 111b)의 형상 및 크기와 대응되게 형성될 수 있다. 이때, 제1 및 제2 용접부(151a, 151b) 사이의 영역(142)은 홈으로 형성될 수 있고, 제1 및 제2 용접부(151a, 151b) 간의 거리(W1)는 제1 및 제2 전극탭(111a, 111b) 간의 거리(W2)와 대응되게 형성될 수 있다. The jig 140 includes first and second welding portions 151a and 151b indirectly contacting the first and second electrode tabs 111a and 111b, respectively, and the first and second welding portions 151a and 151b. may be formed to correspond to the shape and size of the first and second electrode tabs 111a and 111b. In this case, the region 142 between the first and second welding portions 151a and 151b may be formed as a groove, and the distance W1 between the first and second welding portions 151a and 151b is equal to the first and second electrodes. It may be formed to correspond to the distance W2 between the tabs 111a and 111b.

상기 용접 부재(150)는 제1 및 제2 전극탭(111a, 111b)과 대응되게 형성되어 각각 접촉하는 제1 및 제2 용접 부재(151a, 151b)를 포함하고, 상기 용접 부재(150)는 열전도성 부재, 또는 유리로 이루어질 수 있는데, 용접 부재(150)가 열전도성 부재로 형성될 경우, 납보다 더 높은 녹는점을 갖는 재질로 형성됨이 바람직하다. 또한, 상기 용접 부재(150)는 용접시 제1 및 제2 전극탭(111a, 111b)의 상부에 각각 구비되거나, 상기 지그(140)의 제1 및 제2 용접부(141a, 141b)에 각각 결합되어 구비될 수 있다. 용접 부재(150)가 지그(140)의 제1 및 제2 용접부(141a, 141b)에 구비될 경우, 용접시 용접을 보다 용이하게 수행할 수 있어 작업의 효율성을 향상시킬 수 있다.The welding member 150 includes first and second welding members 151a and 151b that are formed to correspond to the first and second electrode tabs 111a and 111b and contact each other, and the welding member 150 includes It may be made of a thermally conductive member or glass. When the welding member 150 is formed of a thermally conductive member, it is preferably formed of a material having a higher melting point than lead. In addition, the welding member 150 is provided on the first and second electrode tabs 111a and 111b during welding, respectively, or coupled to the first and second welding portions 141a and 141b of the jig 140 , respectively. and can be provided. When the welding member 150 is provided in the first and second welding portions 141a and 141b of the jig 140 , it is possible to more easily perform welding during welding, thereby improving work efficiency.

예컨대, 상기 용접 부재(150)는 제1 및 제2 전극탭(111a, 111b)과 지그(140) 사이에 매개체로써 구비된다. 그러므로 용접 부재(150)가 열전도성 부재로 형성되는 경우에 용접 부재(150)는 레이저로부터의 받은 열을 제1 및 제2 전극탭(111a, 111b)과 제1 및 제2 전극리드(131a, 131b)에 간접적으로 전달하고, 용접 부재(150)가 유리로 형성되는 경우에는 레이저가 용접 부재(150)를 직접 투과하여 제1 및 제2 전극탭(111a, 111b)과 제1 및 제2 전극리드(131a, 131b)에 열을 직접전달한다.
For example, the welding member 150 is provided as a medium between the first and second electrode tabs 111a and 111b and the jig 140 . Therefore, when the welding member 150 is formed of a thermally conductive member, the welding member 150 receives heat from the laser to the first and second electrode tabs 111a and 111b and the first and second electrode leads 131a, 131b), and when the welding member 150 is formed of glass, the laser directly penetrates the welding member 150 to the first and second electrode tabs 111a and 111b and the first and second electrodes Heat is directly transferred to the leads 131a and 131b.

전술한 바와 같이, 보호회로모듈(130)의 제1 및 제2 전극리드(131a, 131b)의 상부에는 제1 및 제2 전극탭(111a, 111b)이 각각 위치되고, 지그(140)의 제1 및 제2 용접부(141a, 141b)에 결합되어 구비된 제1 및 제2 용접 부재(151a, 151b)가 제1 및 제2 전극탭(111a, 111b)과 수직 방향으로 같은 선상에 위치되었을 때, 레이저 용접을 실시한다. 이때, 제1 및 제2 전극탭(111a, 111b)과 제1 및 제2 전극리드(131a, 131b)는 직접 또는 간접적으로 전달된 열에 의해 전기적으로 연결될 수 있다.
As described above, the first and second electrode tabs 111a and 111b are respectively positioned on the first and second electrode leads 131a and 131b of the protection circuit module 130, and the When the first and second welding members 151a and 151b provided by being coupled to the first and second welding portions 141a and 141b are positioned on the same line in the vertical direction to the first and second electrode tabs 111a and 111b , and laser welding. In this case, the first and second electrode tabs 111a and 111b and the first and second electrode leads 131a and 131b may be electrically connected by direct or indirectly transferred heat.

이상 본 발명자에 의해서 이루어진 발명을 상기 실시 예에 따라 구체적으로 설명하였지만, 본 발명은 상기 실시 예에 한정되는 것은 아니고 그 요지를 이탈하지 않는 범위에서 여러 가지로 변경 가능한 것은 물론이다.
The invention made by the present inventors has been described in detail according to the above embodiments, but the present invention is not limited to the above embodiments and various modifications can be made without departing from the gist of the present invention.

110 : 전극조립체 111a : 제1 전극탭
111b : 제2 전극탭 120 : 케이스
130 : 보호회로모듈 131a : 제1 전극리드
131b : 제2 전극리드 140 : 지그
150 : 용접 부재
110: electrode assembly 111a: first electrode tab
111b: second electrode tab 120: case
130: protection circuit module 131a: first electrode lead
131b: second electrode lead 140: jig
150: welding member

Claims (8)

제1 및 제2 전극탭이 구비된 전극조립체를 케이스의 수용부에 삽입하는 단계,
상기 전극조립체가 수용된 케이스의 수용부에 전해액을 주입하고 실링부를 열융착하여 실링하는 단계, 및
상기 실링하는 단계 이후에, 상기 전극조립체와 반대되는 실링부의 외부에 배치된 제1 및 제2 전극탭과 보호회로모듈을 용접하는 단계를 포함하고,
상기 용접하는 단계에서 용접은 지그에 의해 이루어지되, 상기 지그와 상기 제1 및 제2 전극탭과 접촉되는 영역에는 용접 부재가 구비되는 이차전지의 제조방법.
Inserting the electrode assembly provided with the first and second electrode tabs into the receiving portion of the case;
Injecting an electrolyte into the receiving part of the case in which the electrode assembly is accommodated and sealing the sealing part by heat sealing, and
After the sealing step, comprising the step of welding the first and second electrode tabs and the protective circuit module disposed outside the sealing portion opposite to the electrode assembly,
In the welding step, welding is performed by a jig, and a welding member is provided in a region in contact with the jig and the first and second electrode tabs.
 제1항에 있어서,
상기 지그는 상기 제1 및 제2 전극탭에 각각 간접 접촉하는 제1 및 제2 용접부를 포함하고,
상기 제1 및 제2 용접부는 제1 및 제2 전극탭과 대응되게 형성되는 이차전지의 제조방법.
According to claim 1,
The jig includes first and second welding portions respectively indirectly contacting the first and second electrode tabs,
The method of manufacturing a secondary battery in which the first and second welding portions are formed to correspond to the first and second electrode tabs.
 제2항에 있어서,
상기 제1 및 제2 용접부 간의 거리는 제1 및 제2 전극탭 간의 거리와 대응되는 이차전지의 제조방법.
3. The method of claim 2,
A distance between the first and second welding portions corresponds to a distance between the first and second electrode tabs.
 제1항에 있어서,
상기 용접 부재는 제1 및 제2 전극탭과 각각 대응되게 형성되는 제1 및 제2 용접 부재를 포함하고,
상기 제1 및 제2 용접 부재는 상기 지그의 제1 및 제2 용접부에 각각 결합되는 이차전지의 제조방법.
According to claim 1,
The welding member includes first and second welding members respectively formed to correspond to the first and second electrode tabs,
The method of manufacturing a secondary battery wherein the first and second welding members are respectively coupled to the first and second welding portions of the jig.
 제1항에 있어서,
상기 용접은 레이저에 의해 수행되는 이차전지의 제조방법.
According to claim 1,
The welding is a method of manufacturing a secondary battery is performed by a laser.
 제1항에 있어서,
상기 용접 부재는 열전도성 부재인 이차전지의 제조방법.
According to claim 1,
The welding member is a method of manufacturing a secondary battery that is a thermally conductive member.
 제6항에 있어서,
상기 열전도성 부재는 납보다 더 높은 녹는점을 갖는 이차전지의 제조방법.
7. The method of claim 6,
The method of manufacturing a secondary battery wherein the thermally conductive member has a melting point higher than that of lead.
 제1항에 있어서,
상기 용접 부재는 유리인 이차전지의 제조방법.According to claim 1,
The method of manufacturing a secondary battery wherein the welding member is glass.
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