KR102072481B1 - Method of Inspecting Welding State Using Pressure Gauge - Google Patents

Method of Inspecting Welding State Using Pressure Gauge Download PDF

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KR102072481B1
KR102072481B1 KR1020160034583A KR20160034583A KR102072481B1 KR 102072481 B1 KR102072481 B1 KR 102072481B1 KR 1020160034583 A KR1020160034583 A KR 1020160034583A KR 20160034583 A KR20160034583 A KR 20160034583A KR 102072481 B1 KR102072481 B1 KR 102072481B1
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welding
pressure
battery cell
pressure gauge
battery
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KR20170110331A (en
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임승원
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주식회사 엘지화학
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    • 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
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
    • B23K31/125—Weld quality monitoring
    • 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
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • 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
    • B23K13/00—Welding by high-frequency current heating
    • 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
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M2/1016—
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/54—

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Quality & Reliability (AREA)
  • Plasma & Fusion (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

본 발명은 압력게이지를 사용하여 용접 상태를 검사하는 방법에 관한 것으로, 더욱 상세하게는 전지셀의 전극단자들에 전극 탭 또는 외부 회로와의 전기적 연결을 위한 버스 바가 용접된 용접부의 용접 상태를 검사하기 위한 방법으로서, (a) 가압 공기에 의해 압력을 측정하는 압력게이지가 장착된 지그를 전지셀의 용접부에 밀착시키는 과정; (b) 상기 지그에 설정된 압력으로 가압 공기를 인가하는 과정; (c) 정상용접이 이루어진 전지셀의 용접부에 가해진 압력에 대하여 상기 압력게이지를 사용하여 측정된 압력의 차이를 비교하는 과정; 및 (d) 상기 압력 차이가 설정 범위 내이면 정상용접으로 판단하고, 설정 범위를 벗어나면 용접관통에 의한 불량으로 판단하는 과정;을 포함하는 용접 검사 방법을 제공한다.The present invention relates to a method for inspecting a welding state using a pressure gauge, and more particularly, to inspecting a welding state of a welded portion in which a bus bar is welded to an electrode terminal of a battery cell for electrical connection with an electrode tab or an external circuit. A method for performing the above method comprises: (a) bringing a jig equipped with a pressure gauge for measuring pressure by pressurized air, into close contact with a welding part of a battery cell; (b) applying pressurized air at a pressure set in the jig; (c) comparing the pressure difference measured using the pressure gauge with respect to the pressure applied to the welded portion of the battery cell in which the normal welding is performed; And (d) if the pressure difference is within the set range is determined as normal welding, if out of the set range is determined to be a defect due to welding penetration; provides a welding inspection method comprising a.

Description

압력게이지를 사용하여 용접 상태를 검사하는 방법 {Method of Inspecting Welding State Using Pressure Gauge}How to Inspect Welding State Using Pressure Gauge {Method of Inspecting Welding State Using Pressure Gauge}

본 발명은 압력게이지를 사용하여 용접 상태를 검사하는 방법에 관한 것이다.The present invention relates to a method for inspecting a weld state using a pressure gauge.

최근, 충방전이 가능한 이차전지는 와이어리스 모바일 기기의 에너지원으로 광범위하게 사용되고 있다. 또한, 이차전지는, 화석 연료를 사용하는 기존의 가솔린 차량, 디젤 차량 등의 대기오염 등을 해결하기 위한 방안으로 제시되고 있는 전기자동차, 하이브리드 전기자동차 등의 에너지원으로서도 주목받고 있다. 따라서, 이차전지를 사용하는 애플리케이션의 종류는 이차전지의 장점으로 인해 매우 다양화되고 있으며, 향후에는 지금보다는 많은 분야와 제품들에 이차전지가 적용될 것으로 예상된다.Recently, secondary batteries capable of charging and discharging have been widely used as energy sources of wireless mobile devices. In addition, secondary batteries are attracting attention as energy sources such as electric vehicles and hybrid electric vehicles, which are proposed as a way to solve air pollution of conventional gasoline and diesel vehicles using fossil fuel. Therefore, the type of applications using the secondary battery is very diversified due to the advantages of the secondary battery, and it is expected that the secondary battery will be applied to many fields and products in the future.

이러한 이차전지는 전극과 전해액의 구성에 따라 리튬이온 전지, 리튬이온 폴리머 전지, 리튬 폴리머 전지 등으로 분류되기도 하며, 그 중 전해액의 누액 가능성이 적으며, 제조가 용이한 리튬이온 폴리머 전지의 사용량이 늘어나고 있다.Such secondary batteries may be classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, etc. according to the composition of the electrode and the electrolyte, and among them, there is little possibility of leakage of the electrolyte, and the amount of lithium ion polymer batteries that are easy to manufacture is high. Growing.

일반적으로, 이차전지는 전지케이스의 형상에 따라, 전극조립체가 원통형 또는 각형의 금속 캔에 내장되어 있는 원통형 전지 및 각형 전지와, 전극조립체가 알루미늄 라미네이트 시트의 파우치형 케이스에 내장되어 있는 파우치형 전지로 분류된다.In general, secondary batteries are cylindrical batteries and rectangular batteries in which the electrode assembly is embedded in a cylindrical or rectangular metal can, and pouch-type batteries in which the electrode assembly is embedded in a pouch type case of an aluminum laminate sheet according to the shape of the battery case. Classified as

도 1은 종래의 원통형 전지의 단면도이다.1 is a cross-sectional view of a conventional cylindrical battery.

도 1을 참조하면, 원통형 이차전지(10)는 젤리-롤형(권취형) 전극조립체(12)를 원통형 케이스(13)에 수납하고, 원통형 케이스(13) 내에 전해액을 주입한 후에, 케이스(13)의 개방 상단에 전극 단자(예를 들어, 양극 단자; 도시하지 않음)가 형성되어 있는 캡 어셈블리(14)를 결합하여 제작한다.Referring to FIG. 1, the cylindrical secondary battery 10 accommodates a jelly-roll type (wound) electrode assembly 12 in a cylindrical case 13, and injects an electrolyte solution into the cylindrical case 13, followed by a case 13. ) Is manufactured by combining the cap assembly 14 having the electrode terminal (for example, a positive electrode terminal;

전극조립체(12)는 양극(12a)과 음극(12b), 및 이들 사이에 분리막(12c)을 개재한 후 둥근 형태로 감은 구조로서, 그것의 권심(젤리-롤의 중심부)에는 원통형의 센터 핀(15)이 삽입되어 있다. 센터 핀(15)은 일반적으로 소정의 강도를 부여하기 위해 금속 소재로 이루어져 있으며, 판재를 둥글게 절곡한 중공형의 원통형 구조로 이루어져 있다. 이러한 센터 핀(15)은 전극조립체를 고정 및 지지하는 작용과 충방전 및 작동시 내부 반응에 의해 발생되는 가스를 방출하는 통로로서 작용한다.The electrode assembly 12 has a structure in which a cathode 12a and a cathode 12b and a separator 12c are interposed therebetween, and are wound in a round shape. A cylindrical center pin is formed at its core (center of jelly-roll). (15) is inserted. The center pin 15 is generally made of a metal material to impart a predetermined strength, and has a hollow cylindrical structure in which a plate is rounded. The center pin 15 serves as a passage for fixing and supporting the electrode assembly and for releasing gas generated by internal reaction during charging and discharging and during operation.

원통형 이차전지의 음극 단자에는 음극 탭이 용접에 의해 결합된다. 그러나, 용접이 정상적으로 이루어지지 않으면 용접 후 용접 부위 관통에 의한 누액이 발생한다. 이러한 용접관통이 발생하는 경우에 내부적으로는 수율 저하 및 누액에 의한 오염 우려가 있고, 외부적으로는 전지셀의 안정성 및 품질 문제가 발생할 수 있다.The negative electrode tab is coupled to the negative electrode terminal of the cylindrical secondary battery by welding. However, if welding is not performed normally, leakage occurs due to penetration of the welding site after welding. In the case where such a welding penetration occurs, there is a concern that the yield is lowered and the contamination is caused by leakage, and externally, stability and quality problems of the battery cell may occur.

또한, 용접 후 용접점에 대한 비젼 검사시 정상 용접점 및 불량 용접점 간의 정확한 구분이 되지 않으므로 비젼 검사에 의한 자동검사가 불가능하다는 문제가 있다.In addition, there is a problem that automatic inspection by vision inspection is not possible because the accurate inspection between the normal welding point and the poor welding point is not possible during the vision inspection of the welding point after welding.

따라서, 전지셀을 진공 챔버에 수납하여 누액 가속검사 후에 작업자의 의한 육안검사에 의존 할 수 밖에 없으므로 선별 인원 증가에 따른 인건비 향상 요인과 작업자 숙련도에 따라 선별력에 편차가 크다는 문제가 있다.Therefore, since the battery cells are stored in the vacuum chamber and the liquid leakage acceleration test cannot be relied on by the naked eye inspection, there is a problem that the screening force varies greatly according to the labor cost improvement factor and operator skill due to the increase in the screening personnel.

이와 같이, 종래의 전극단자의 용접부위에 대한 검사 방식에 의해서는 전지셀의 품질 및 생산성을 저하시키게 된다.As described above, the inspection method for the welding part of the electrode terminal of the related art lowers the quality and productivity of the battery cell.

본 발명은 상기와 같은 종래기술의 문제점과 과거로부터 요청되어온 기술적 과제를 해결하는 것을 목적으로 한다.The present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

구체적으로, 본 발명의 목적은 전극단자의 용접부위에서 용접이 정상적으로 이루어지지 않으면 용접 후 용접 부위 관통에 의한 누액이 발생하여 수율 저하 및 누액에 의한 문제점을 해결하기 위한 것으로, 압력게이지가 장착된 지그를 전지셀의 용접부에 밀착시켜 가압 공기를 인가하고 정상용접이 이루어진 전지셀의 용접부에 가해진 압력과 압력게이지를 사용하여 측정된 압력의 차이를 비교하고, 압력 차이가 설정 범위 내이면 정상용접으로 판단하며, 설정 범위를 벗어나면 용접관통에 의한 불량으로 판단하는 용접 검사 방법을 제공하는 것이다.Specifically, an object of the present invention is to solve the problems caused by the leakage and leakage caused by the leakage of the welding portion after welding if the welding is not normally made in the welding portion of the electrode terminal, jig equipped with a pressure gauge Apply pressurized air in close contact with the welding part of the battery cell, and compare the difference between the measured pressure and the pressure applied to the welding part of the battery cell in which the normal welding is made.If the pressure difference is within the setting range, it is judged as normal welding. To provide a welding inspection method for determining that the defect caused by the welding penetration is out of the set range.

이러한 목적을 달성하기 위한 본 발명에 따른 압력게이지를 사용하여 용접 상태를 검사하는 방법은,Method for inspecting the welding state using the pressure gauge according to the present invention for achieving this object,

전지셀의 전극단자들에 전극 탭 또는 외부 회로와의 전기적 연결을 위한 버스 바가 용접된 용접부의 용접 상태를 검사하기 위한 방법으로서,A method for inspecting a welding state of a welded portion in which a bus bar for electrical connection with an electrode tab or an external circuit is welded to electrode terminals of a battery cell,

(a) 가압 공기에 의해 압력을 측정하는 압력게이지가 장착된 지그를 전지셀의 용접부에 밀착시키는 과정;(A) a step of bringing the jig equipped with a pressure gauge for measuring the pressure by the pressurized air in close contact with the welding portion of the battery cell;

(b) 상기 지그에 설정된 압력으로 가압 공기를 인가하는 과정;(b) applying pressurized air at a pressure set in the jig;

(c) 정상용접이 이루어진 전지셀의 용접부에 가해진 압력에 대하여 상기 압력게이지를 사용하여 측정된 압력의 차이를 비교하는 과정; 및(c) comparing the pressure difference measured using the pressure gauge with respect to the pressure applied to the welded portion of the battery cell in which the normal welding is performed; And

(d) 상기 압력 차이가 설정 범위 내이면 정상용접으로 판단하고, 설정 범위를 벗어나면 용접관통에 의한 불량으로 판단하는 과정;(d) determining the normal welding when the pressure difference is within the setting range, and determining the failure by the welding through when the pressure difference is out of the setting range;

을 포함하고 있는 구조로 구성되어 있다.It consists of a structure that includes.

즉, 본 발명에 따른 압력게이지를 사용하여 용접 상태를 검사하는 방법은, 전지셀의 전극단자들의 용접 부위에 대한 검사 방법 및 상기 방법에 의해 제조된 전지셀을 제공하여 용접 불량으로 발생되는 전지셀의 품질 및 안정성을 향상시킬 수 있다.That is, the method for inspecting the welding state using the pressure gauge according to the present invention, the battery cell produced by the welding failure by providing a method for inspecting the welding portion of the electrode terminals of the battery cell and the battery cell manufactured by the method Can improve the quality and stability.

본 발명에 따르면, 상기 전지셀은 원통형 전지일 수 있다.According to the present invention, the battery cell may be a cylindrical battery.

하나의 구체적인 예에서, 상기 원통형 전지는 양극판에 결합된 양극 탭과 음극판에 결합된 음극 탭이 외향 돌출되어 있는 젤리-롤형 전극조립체를 포함하고 있고, 양극 탭 또는 음극 탭이 전지케이스의 전극단자에 용접된 용접부의 용접 상태를 검사할 수 있다.In one specific example, the cylindrical battery includes a jelly-roll type electrode assembly in which the positive electrode tab coupled to the positive electrode plate and the negative electrode tab coupled to the negative electrode plate protrude outward, and the positive electrode tab or negative electrode tab is connected to the electrode terminal of the battery case. The welding state of the welded weld can be inspected.

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예를 들어, 상기 용접은 초음파 용접, 레이저 용접, 및 저항용접 중 하나 이상의 방법으로 용접할 수 있다.For example, the welding may be performed by one or more of ultrasonic welding, laser welding, and resistance welding.

본 발명에 따르면, 상기 압력게이지는 중공형의 부재이며, 전지셀의 용접부에 가해지는 압력을 측정하기 위해, 개방된 일면이 전지셀의 용접부에 밀착되어 있고 개방된 타면이 지그에 결합될 수 있다.According to the present invention, the pressure gauge is a hollow member, in order to measure the pressure applied to the welding portion of the battery cell, one open surface is in close contact with the welding portion of the battery cell and the other open surface may be coupled to the jig. .

이 때, 압력게이지는 디지털방식의 압력게이지일 수 있다.In this case, the pressure gauge may be a digital pressure gauge.

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본 발명에 따르면, 상기 과정(a) 이전에, (i) 전지셀의 전극단자에 용접을 수행하고, 전지셀을 고정하는 과정을 더 포함할 수 있다.According to the present invention, before the process (a), (i) performing a welding on the electrode terminal of the battery cell, and may further comprise the step of fixing the battery cell.

구체적인 예에서, 상기 과정(d)에서, 정상용접의 판단을 위한 압력 차이의 설정 범위는 정상용접의 압력에 대해 0% 내지 30% 범위에서 설정될 수 있다.In a specific example, in the process (d), the setting range of the pressure difference for determining the normal welding may be set in the range of 0% to 30% with respect to the pressure of the normal welding.

경우에 따라서, 상기 과정(d) 이후에, 용접부의 간격이 벌어지거나 탈리되는 경우 약용접이 발생한 것으로 판단하는 과정(e)를 더 포함할 수 있다.In some cases, after the step (d), it may further include a step (e) of determining that the weak welding occurs when the gap between the welding portion is opened or detached.

이 경우에, 상기 과정(e) 이후에, 용접부의 외관을 육안으로 검사하는 과정을 더 포함할 수 있다.In this case, after the process (e), it may further include a step of visually inspecting the appearance of the weld.

본 발명은 용접 검사 방법에서 정상용접으로 판단된 전지셀을 제공한다.The present invention provides a battery cell determined to be normal welding in the welding inspection method.

본 발명은 또한, 상기 전지셀을 포함하는 전지팩을 제공한다.The present invention also provides a battery pack including the battery cell.

본 발명은 또한, 상기 전지팩을 전원으로 포함하는 디바이스를 제공한다.The present invention also provides a device including the battery pack as a power source.

상기 디바이스는 컴퓨터, 휴대폰, 웨어러블 전자기기, 파워 툴(power tool), 전기자동차(Electric Vehicle: EV), 하이브리드 전기자동차, 플러그-인 하이브리드 전기자동차, 전기 이륜차, 전기 골프 카트, 또는 전력저장용 시스템 등으로부터 선택되는 것일 수 있다.The device may be a computer, a mobile phone, a wearable electronic device, a power tool, an electric vehicle (EV), a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric motorcycle, an electric golf cart, or a system for power storage. Or the like.

이러한 디바이스의 구조 및 제작 방법은 당업계에 공지되어 있으므로, 본 명세서에서는 그에 대한 자세한 설명을 생략한다.Since the structure and fabrication method of such a device are known in the art, detailed description thereof will be omitted herein.

이상에서 설명한 바와 같이, 본 발명에 따른 압력게이지를 사용하여 용접 상태를 검사하는 방법은, 전지셀의 전극단자들의 용접 부위에 대한 향상된 검사 방법 및 상기 방법에 의해 제조된 전지셀을 제공하여 용접 불량으로 발생되는 전지셀의 품질 및 안정성을 향상시킬 수 있다.As described above, the method for inspecting the welding state using the pressure gauge according to the present invention, an improved inspection method for the welded portion of the electrode terminals of the battery cell, and providing a battery cell manufactured by the method is poor welding It is possible to improve the quality and stability of the generated battery cells.

또한, 종래의 전지셀을 진공 챔버에 수납하여 누액 가속검사 후에 작업자의 의한 육안검사에 의한 인건비 향상 요인과 작업자 숙련도에 따라 선별력에 편차가 큰 문제를 해결하여 전지셀의 품질 향상 및 생산성을 향상시킬 수 있는 효과를 제공한다.In addition, by storing the conventional battery cell in a vacuum chamber to improve the quality and productivity of the battery cell by solving the problem of large deviation in the screening force according to the labor cost improvement factor and the operator skill by the visual inspection by the operator after the leak leakage acceleration test It can be effective.

도 1은 종래의 원통형 이차전지의 단면 모식도이다;
도 2는 본 발명의 하나의 실시예에 따른 압력게이지를 사용하여 용접 상태를 검사하는 지그 및 전지셀의 모식도이다;
도 3은 본 발명의 하나의 실시예에 따른 압력게이지를 사용하여 용접 상태를 검사하는 방법의 흐름도이다.1 is a schematic cross-sectional view of a conventional cylindrical secondary battery;
2 is a schematic view of a jig and a battery cell for inspecting a welding state using a pressure gauge according to an embodiment of the present invention;
3 is a flow chart of a method for inspecting a weld state using a pressure gauge in accordance with one embodiment of the present invention.

이하에서는, 본 발명의 실시예에 따른 도면을 참조하여 설명하지만, 이는 본 발명의 더욱 용이한 이해를 위한 것으로, 본 발명의 범주가 그것에 의해 한정되는 것은 아니다.Hereinafter, although described with reference to the drawings according to an embodiment of the present invention, this is for easier understanding of the present invention, the scope of the present invention is not limited thereto.

도 2에는 본 발명의 하나의 실시예에 따른 압력게이지를 사용하여 용접 상태를 검사하는 방법의 모식도가 도시되어 있다.2 is a schematic diagram of a method for inspecting a welding state using a pressure gauge according to an embodiment of the present invention.

도 2를 참조하면, 전지셀(130)의 음극단자(137)에 용접된 용접부위들의 용접 상태를 검사하기 위해 압력게이지(120)가 장착된 지그(110)를 전지셀(130)의 용접이 이루어진 음극단자(137)에 밀착시킨다.Referring to FIG. 2, the welding of the battery cell 130 is performed by mounting the jig 110 equipped with the pressure gauge 120 to inspect the welding state of the welded portions welded to the negative electrode terminal 137 of the battery cell 130. It is in close contact with the negative electrode terminal 137 made.

용접부들(131, 133, 135)은 3개의 위치에서 이루어져 있고, 각각의 용접부들(131, 133, 135)은 정상용접부(131), 용접관통부(133), 약용접부(135)가 발생된 것을 나타낸다.The welds 131, 133, and 135 are formed at three positions, and each of the welds 131, 133, and 135 is formed of the normal weld 131, the weld through 133, and the weak weld 135. Indicates.

정상용접부(131)는 지그(110)를 전지셀(130)의 용접부에 밀착시켜서 가압 공기를 가압하고 용접관통이 발생하지 않아 공기가 유출되지 않으므로 가압 압력을 유지하므로 정상으로 판정된다.The normal welding part 131 contacts the jig 110 with the welding part of the battery cell 130 to pressurize the pressurized air and does not generate a weld through, so that the pressurized air is maintained so that the pressurized pressure is maintained.

용접관통(133)이 발생한 부위는 음극단자(137)에 구멍이 형성되어 초기 가압한 압력과 달라지므로 강용접이 발생한 것으로 판단한다.The portion where the welding through 133 is generated is determined to have a strong welding because a hole is formed in the negative electrode terminal 137 and is different from the initial pressure.

약용접부(135)에서는 지그(110)를 밀착하고 공기를 가압하면 용접이 정상용접과 비교하여 약하게 이루어졌으므로 간격이 벌어지거나 탈리되어 약용접이 발생한 것으로 판단한다.In the weak welding part 135, when the jig 110 is in close contact and pressurized air, the welding is made weaker than the normal welding, so the gap is opened or detached, and it is determined that the weak welding has occurred.

도 3에는 전지셀의 전극단자들에 전극 탭 또는 외부 회로와의 전기적으로 연결하도록 버스 바가 용접된 용접부의 용접 상태를 검사하기 위한 방법의 흐름도가 도시되어 있다.3 is a flowchart of a method for inspecting a welding state of a welded portion of a bus bar welded to an electrode tab or an external circuit electrically connected to electrode terminals of a battery cell.

도 3을 참조하면, (a) 가압 공기에 의해 압력을 측정하는 압력게이지가 장착된 지그를 전지셀의 용접부에 밀착시킨다(S110). (b) 상기 지그에 설정된 압력으로 가압 공기를 인가한다(S120). (c) 정상용접이 이루어진 전지셀의 용접부에 가해진 압력에 대하여 압력게이지를 사용하여 측정된 압력의 차이를 비교한다(S130). (d) 압력 차이가 설정 범위 내이면(S140) 정상용접으로 판단하고(S150), 압력 차이가 설정 범위를 벗어나면 용접관통에 의한 불량으로 판단하므로(S210), 용접관통이 발생하는 경우를 용이하게 판단할 수 있으므로 전지셀의 품질 향상 및 생산성을 향상시킬 수 있다.Referring to Figure 3, (a) the jig equipped with a pressure gauge for measuring the pressure by the pressurized air is in close contact with the welding portion of the battery cell (S110). (b) Pressurized air is applied at the pressure set in the jig (S120). (C) compare the difference of the pressure measured using the pressure gauge with respect to the pressure applied to the welding portion of the battery cell is normal welding (S130). (d) If the pressure difference is within the setting range (S140) is judged to be normal welding (S150), if the pressure difference is out of the setting range is judged to be a defect due to welding penetration (S210), it is easy to occur when welding penetration occurs It can be judged to be able to improve the quality and productivity of the battery cell can be improved.

과정(d)에서, 정상용접의 판단을 위한 압력 차이의 설정 범위는 정상용접의 압력에 대해 0% 내지 30% 범위에서 설정된다. 과정(d) 이후에, 용접부의 간격이 벌어지거나 탈리되는 경우 약용접이 발생한 것으로 판단하는 과정(e)을 더 포함하고, 과정(e) 이후에, 용접부의 외관을 육안으로 검사하는 과정을 더 포함한다.In the process (d), the setting range of the pressure difference for the determination of the normal welding is set in the range of 0% to 30% with respect to the pressure of the normal welding. After the step (d), further comprising the step (e) of judging that the weak welding has occurred when the gap between the welds is widened or detached, and after the process (e), the process of visually inspecting the appearance of the welds further Include.

본 발명이 속한 분야에서 통상의 지식을 가진 자라면, 상기 내용을 바탕으로 본 발명의 범주 내에서 다양한 응용 및 변형을 행하는 것이 가능할 것이다.Those skilled in the art to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above contents.

Claims (16)

전지셀의 전극단자들에 전극 탭 또는 외부 회로와의 전기적 연결을 위한 버스 바가 용접된 용접부의 용접 상태를 검사하기 위한 방법으로서,
(a) 가압 공기에 의해 압력을 측정하는 압력게이지가 장착된 지그를 전지셀의 용접부에 밀착시키는 과정;
(b) 상기 지그에 설정된 압력으로 가압 공기를 인가하는 과정;
(c) 정상용접이 이루어진 전지셀의 용접부에 가해진 압력에 대하여 상기 압력게이지를 사용하여 측정된 압력의 차이를 비교하는 과정; 및
(d) 상기 압력 차이가 설정 범위 내이면 정상용접으로 판단하고, 설정 범위를 벗어나면 용접관통에 의한 불량으로 판단하는 과정;
을 포함하고,
상기 압력게이지는 중공형의 부재이며, 전지셀의 용접부에 가해지는 압력을 측정하기 위해, 개방된 일면이 전지셀의 용접부에 밀착되어 있고 개방된 타면이 지그에 결합되고,
상기 전지셀은 원통형 전지이며,
상기 원통형 전지는 양극판에 결합된 양극 탭과 음극판에 결합된 음극 탭이 외향 돌출되어 있는 젤리-롤형 전극조립체를 포함하고 있고, 양극 탭 또는 음극 탭이 전지케이스의 전극단자에 용접된 용접부의 용접 상태를 검사하는 것을 특징으로 하는 용접 검사 방법.A method for inspecting a welding state of a welded portion in which a bus bar is welded to the electrode terminals of the battery cell for electrical connection with an electrode tab or an external circuit,
(A) a step of bringing the jig equipped with a pressure gauge for measuring the pressure by the pressurized air in close contact with the welding portion of the battery cell;
(b) applying pressurized air at a pressure set in the jig;
(c) comparing the pressure difference measured using the pressure gauge with respect to the pressure applied to the welded portion of the battery cell in which the normal welding is performed; And
(d) determining the normal welding when the pressure difference is within the setting range, and determining the failure by the welding through when the pressure difference is out of the setting range;
Including,
The pressure gauge is a hollow member, in order to measure the pressure applied to the welding part of the battery cell, one open surface is in close contact with the welding part of the battery cell and the other open surface is coupled to the jig,
The battery cell is a cylindrical battery,
The cylindrical battery includes a jelly-roll type electrode assembly in which a positive electrode tab coupled to a positive electrode plate and a negative electrode tab coupled to a negative electrode plate are protruded outwardly, and a welding state in which a positive electrode tab or a negative electrode tab is welded to an electrode terminal of a battery case is welded. Welding inspection method, characterized in that for checking. 삭제delete 삭제delete 삭제delete 삭제delete 제 1 항에 있어서, 상기 용접은 초음파 용접, 레이저 용접, 및 저항용접 중 하나 이상의 방법으로 용접하는 것을 특징으로 하는 용접 검사 방법.The method of claim 1, wherein the welding is performed by at least one of ultrasonic welding, laser welding, and resistance welding. 삭제delete 제 1 항에 있어서, 상기 압력게이지는 디지털방식의 압력게이지인 것을 특징으로 하는 용접 검사 방법.The welding test method according to claim 1, wherein the pressure gauge is a digital pressure gauge. 삭제delete 제 1 항에 있어서, 상기 과정(a) 이전에, (i) 전지셀의 전극단자에 용접을 수행하고, 전지셀을 고정하는 과정을 더 포함하는 것을 특징으로 하는 용접 검사 방법.The welding inspection method according to claim 1, further comprising (i) performing welding on the electrode terminals of the battery cells and fixing the battery cells before the process (a). 제 1 항에 있어서, 상기 과정(d)에서, 정상용접의 판단을 위한 압력 차이의 설정 범위는 정상용접의 압력에 대해 0% 내지 30% 범위에서 설정되는 것을 특징으로 하는 용접 검사 방법.The welding inspection method according to claim 1, wherein in the step (d), the setting range of the pressure difference for the determination of the normal welding is set in the range of 0% to 30% with respect to the pressure of the normal welding. 제 1 항에 있어서, 상기 과정(d) 이후에, 용접부의 간격이 벌어지거나 탈리되는 경우 약용접이 발생한 것으로 판단하는 과정(e)를 더 포함하는 것을 특징으로 하는 용접 검사 방법.The welding inspection method according to claim 1, further comprising, after the step (d), a step (e) of determining that the weak welding occurs when the gap between the welds is extended or detached. 제12항에 있어서, 상기 과정(e) 이후에, 용접부의 외관을 육안으로 검사하는 과정을 더 포함하는 것을 특징으로 하는 용접 검사 방법.The welding inspection method according to claim 12, further comprising visually inspecting the appearance of the weld portion after the process (e). 삭제delete 삭제delete 삭제delete
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