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WO2019083124A1 - Secondary battery - Google Patents

Secondary battery

Info

Publication number
WO2019083124A1
WO2019083124A1 PCT/KR2018/007781 KR2018007781W WO2019083124A1 WO 2019083124 A1 WO2019083124 A1 WO 2019083124A1 KR 2018007781 W KR2018007781 W KR 2018007781W WO 2019083124 A1 WO2019083124 A1 WO 2019083124A1
Authority
WO
WIPO (PCT)
Prior art keywords
welding
circuit module
case
protection circuit
secondary battery
Prior art date
Application number
PCT/KR2018/007781
Other languages
French (fr)
Korean (ko)
Inventor
박상훈
Original Assignee
삼성에스디아이(주)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성에스디아이(주) filed Critical 삼성에스디아이(주)
Publication of WO2019083124A1 publication Critical patent/WO2019083124A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • 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
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • An embodiment of the present invention relates to a secondary battery equipped with a protection circuit module.
  • the secondary battery can perform charging and discharging repeatedly.
  • a small-capacity secondary battery is mainly used for portable electronic equipment such as a mobile phone, a notebook computer, a camcorder, etc.
  • a large-capacity secondary battery can be used for electric vehicles and the like.
  • the secondary battery is equipped with a protection circuit module (PCM) for protecting the secondary battery from explosion, durability, and high performance by protecting the secondary battery from over discharge, overcharge, overcurrent, Protection circuit modules can often be joined by welding, and it is important that they are welded stably and reliably in order to effectively perform this role.
  • PCM protection circuit module
  • An embodiment of the present invention provides a secondary battery in which a protection circuit module can be stably welded.
  • a secondary battery includes an electrode assembly, an electrode tab extended from the electrode assembly, a microchip for preventing overdischarge of the electrode assembly, a case accommodating the microchip, and an electrically conductive material, And a welding portion that is welded to the tab and is supported at one point on the case and electrically connected to the microchip.
  • the case is formed with a depression which is recessed from one side to the inside and is connected to the lower surface from the upper surface to the lower surface.
  • the welding portion is formed on the lower surface of the case to have an area corresponding to the depression, and is made of an electrically conductive material.
  • a mounting portion which is extended in any one direction and is attached to a lower surface of the protection circuit module and is electrically connected to the microchip so that the welding portion is supported by the case at one point to be electrically connected to the microchip .
  • the welding portion and the attaching portion may be integrally formed.
  • attachment portion may extend from the welded portion in a direction in which the depression is recessed.
  • the welding portion may be provided with a plurality of welding points, and holes may be formed between the plurality of welding points.
  • the hole may be disposed on a straight line connecting any two welding points among the plurality of welding points.
  • the hole may be formed to extend in a direction transverse to the straight line.
  • the welding portion of the protection circuit module is supported on the case in the form of a cantilever so that the tip can be moved up and down with respect to the case, the protection circuit module can be deformed to come into tight contact with the electrode tab of the battery cell have. Therefore, the welding efficiency can be improved by welding the electrode tab and the welded portion in a state of being in tight contact with each other.
  • the welding portion when a plurality of welding points are provided in the welding portion, holes are formed between the welding points so that the heat can be prevented from being conducted from one welding point to another welding point as much as possible.
  • the welding quality can be improved by applying comparatively similar heat to all welding points.
  • FIG. 1 is a perspective view of a secondary battery according to an embodiment of the present invention.
  • FIG. 2 is a perspective view of a protection circuit module of a secondary battery according to an embodiment of the present invention.
  • FIG 3 is a plan view of a protection circuit module of a secondary battery according to an embodiment of the present invention.
  • FIG. 4 is a bottom view of a protection circuit module of a secondary battery according to an embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of a protection circuit module of a secondary battery according to an embodiment of the present invention.
  • FIG. 6 is a bottom view of a modification of the protection circuit module of a secondary battery according to an embodiment of the present invention.
  • FIG. 7 illustrates a process of disposing a battery cell of a secondary battery according to an embodiment of the present invention on a jig.
  • FIG. 8 illustrates a process of disposing and pressing a protection circuit module of a secondary battery according to an embodiment of the present invention on a battery cell.
  • FIG. 9 illustrates a process of welding a battery cell and a protection circuit module of a secondary battery according to an embodiment of the present invention.
  • FIG. 10 is a plan view of a protection circuit module of a secondary battery according to another embodiment of the present invention.
  • FIG. 11 is a plan view of a modification of the protection circuit module of a secondary battery according to another embodiment of the present invention.
  • connection means not only when the member A and the member B are directly connected but also when the member C is interposed between the member A and the member B and the member A and the member B are indirectly It is interpreted to include the case of connection.
  • first, second, etc. are used herein to describe various elements, components, regions, layers and / or sections, it is to be understood that these elements, components, regions, layers and / Can not be done. It is used to distinguish one element, component, region, layer or section from another, member, component, region, layer or section. Thus, for example, a first member, component, region, layer or section may be referred to as a second member, component, region, layer or section without departing from the invention.
  • Beneath, " “ below, “ “ lower, “ “ above, “ or “ above, “quot; upper” can be used.
  • the term for such a space is not intended to limit the present invention for a clear understanding of the present invention depending on various process states or conditions of use of the present invention. For example, when an element or feature is inverted, the element or feature described as “ lower “ or “ below “ As a result, “lower” is a concept that includes “upper” or "upper”.
  • FIG. 1 is a perspective view of a secondary battery 100 according to an embodiment of the present invention, in which a battery cell 110 and a protection circuit module 120 are separated.
  • a secondary battery 100 includes a battery cell 110 and a protection circuit module 120.
  • the battery cell 110 includes an electrode assembly (not shown) composed of a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate, a cover 111 for housing the electrode assembly, a positive electrode tab A negative electrode tab (hereinafter collectively referred to as " electrode tab ”) 112, and the like. Therefore, detailed description of the battery cell 110 itself is omitted because it is well known in the art.
  • the battery cell 110 is shown as being formed in a so-called pouch type.
  • the battery cell 110 is not necessarily formed in a pouch-like shape, but may be formed in a square or other type.
  • the battery cell 110 will be described in the form of a pouch as shown in the figure for convenience of understanding.
  • the protection circuit module 120 prevents overdischarge, overcharge, overcurrent, and the like of the battery cell 110.
  • the protection circuit module 120 includes a microchip 121 (see FIG. 5) for performing the above-mentioned function, a case 122 for accommodating the microchip 121, and a welding portion 123 and an attaching portion 124 Contains the Connect tab.
  • FIG. 2 is a perspective view of a protection circuit module 120 of a secondary battery 100 according to an embodiment of the present invention, which is viewed from an angle different from FIG. 1.
  • 2 is a view of the protection circuit module 120 as viewed from below, if the protection circuit module 120 is viewed from above.
  • 3 is a plan view of a protection circuit module 120 of a secondary battery 100 according to an embodiment of the present invention.
  • FIG. 4 is a plan view of a protection circuit module 120 of a secondary battery 100 according to an embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of a protection circuit module 120 of a secondary battery 100 according to an embodiment of the present invention, and is taken on line A-A of FIG.
  • the case 122 of the protection circuit module 120 is formed with a depression 122A which is recessed from one side to the inside. At this time, the depressed portion 122A is formed so as to extend from the upper surface to the lower surface of the case 122.
  • the depressions 122A are formed in pairs and spaced apart at specific intervals. One of the two depressions 122A is used to weld the positive electrode tab of the battery cell 110 and the welded portion 123 and the other is used to weld the negative electrode tab and the welded portion 123 of the battery cell 110 Which will be described later. Therefore, the interval between the two depressions 122A corresponds to the interval between the positive electrode tab and the negative electrode tab of the battery cell 110.
  • connection tab is composed of the welding part 123 and the attaching part 124 so that the welding part 123 is welded to the electrode tab 112 of the battery cell 110 and the attaching part 124 is welded to the case 122 So that the electrode tab 112 and the microchip 121 are electrically connected to each other.
  • the welding portion 123 is made of an electrically conductive material having appropriate elasticity.
  • the welding portion 123 is formed in a plate shape as a whole.
  • the welded portion 123 is formed on the lower surface of the case 122 in an area corresponding to the depression 122A.
  • the welded portion 123 is also formed in a rectangular plate shape, and is disposed corresponding to the outline. If the depressed portion 122A has a generally semicircular contour and is recessed inward, the welded portion 123 may be formed in a semicircular or circular plate shape.
  • the attachment portion 124 is also made of an electrically conductive material having appropriate elasticity.
  • the attachment portion 124 is attached to the lower surface of the case 122 by extending in one direction from the welded portion 123.
  • the attachment portion 124 may be attached to the lower surface of the case 122 by soldering.
  • the welding portion 123 and the attaching portion 124 may be integrally formed or separately formed and joined to each other.
  • the welding portion 123 is supported at one point on the case 122 through the attachment portion 124.
  • the welding portion 123 is supported by the case 122 in the form of a cantilever through the attachment portion 124. Therefore, a distal end of the welded portion 123, which is remote from the attaching portion 124, can move up and down with respect to the case 122.
  • the attachment portion 124 is shown extending from the welded portion 123 in a direction in which the depression 122A is recessed and attached to the lower surface of the case 122. As shown in FIG. However, this is a mere example. If the welding portion 123 can be supported in the form of a cantilever in the case 122 through the attachment portion 124 and therefore the distal end remote from the attachment portion 124 can move up and down with respect to the case 122
  • the attachment portion 124 may extend in another direction.
  • the attachment portion 124 ' may be attached to the lower surface of the case 122 by extending in a direction transverse to the concave depression of the depression 122A as shown in FIG.
  • a method of mounting the protection circuit module 120 on the battery cell 110 will be described below based on the structure of the battery cell 110 and the protection circuit module 120 described above.
  • FIG. 7 to 9 illustrate a method of mounting a protection circuit module 120 on a battery cell 110 of a secondary battery 100 according to an embodiment of the present invention.
  • FIG. 8 is a process of disposing the protection circuit module 120 on the battery cell 110
  • FIG. 9 is a process of welding the battery cell and the protection circuit module.
  • the electrode tab 112 of the battery cell 110 is disposed on the welding jig J as shown in FIG.
  • the protection circuit module 120 is disposed on the electrode tab 112 as shown in FIG.
  • the lower surface of the case 122 of the protection circuit module 120 is oriented so as to face the electrode tab 112 so that the welding portion 123 of the protection circuit module 120 contacts the electrode tab 112.
  • the protective circuit module 120 is not completely flat on the lower surface of the case 122 due to the mounting of the microchip 121 due to its structural characteristics, and may be partially bent. Therefore, when the protection circuit module 120 is disposed on the electrode tab 112, the welded portion 123 may not be brought into close contact with the electrode tab 112. There is a problem that welding efficiency may be lowered during welding.
  • the end of the welded portion 123 far from the attachment portion 124 is pressed in the direction of the arrow so that the welded portion 123 is brought into tight contact with the electrode tab 112.
  • the welded portion 123 is supported in the form of a cantilever on the case 122 through the attaching portion 124 as described above so that the distal end far from the attaching portion 124 can make a predetermined flow upward and downward with respect to the case 122
  • the lower surface of the case 122 can be deformed so as to be in tight contact with the electrode tab 112 by the aforementioned pressing even if it is partially bent.
  • the problem is solved by irradiating a laser beam to the welded portion 123 through the depression 122A of the protective circuit module 120 to weld the electrode tab 112 and the welded portion 123 together
  • the welding efficiency can be improved.
  • FIG. 10 is a plan view of a protection circuit module 220 of a secondary battery 200 according to another embodiment of the present invention.
  • the protection circuit module 120 of the secondary battery 200 according to another embodiment of the present invention (220) has a hole (223A) formed in the welded portion (223).
  • Other matters are substantially the same as those of the protection circuit module 120 of the secondary battery 100 according to an embodiment of the present invention. Even if there is a difference, And therefore, a duplicate description thereof will be omitted.
  • a plurality of welding points for example, A welding point P1 and a second welding point P2 may be provided.
  • a hole 223A is formed in the welding portion 223 between the welding points P1 and P2. According to this, since the path through which heat can be conducted from the first welding point P1 to the second welding point P2 is partially cut off by the hole 223A, the degree of heat conduction is also reduced. Therefore, a relatively similar heat is applied to the first welding point P1 and the second welding point P2 when the first welding point P1 is first welded and the second welding point P2 is welded next. Accordingly, the above problems can be solved and the welding quality can be improved.
  • the hole 223A connects the first welding point P1 and the second welding point P2 And can be arranged on a virtual straight line. Also, the hole 223A may be formed to extend along the imaginary straight line.
  • the specific shape and area of the hole 223A may vary depending on the number and arrangement of welding points, the strength of the welding portion 223, and the like. If four welding points, for example a first welding point P1, a second welding point P2, a third welding point P3 and a fourth welding point P4 are formed and arranged in the form of a vertex of a quadrangle, 223A 'may be formed in a cross shape at the center of the welding points P1, P2, P3, P4 as shown in FIG. Of course, this is a mere example, and it can be changed as needed.

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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)
  • Microelectronics & Electronic Packaging (AREA)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

An embodiment of the present invention relates to a secondary battery having a protection circuit module mounted thereto, and the technical problem thereof to be address is provide a secondary battery to which a protection circuit module can be stably welded. To this end, the present invention provides a secondary battery comprising: an electrode assembly; an electrode tab drawn out from the electrode assembly; a microchip for preventing overcharging of the electrode assembly; a case for accommodating the microchip; and a weld part which is made of an electrically conductive material, is welded to the electrode tab, is one-point-supported on the case, and is electrically connected to the microchip.

Description

이차전지Secondary battery
본 발명의 실시예는 보호회로모듈이 장착된 이차전지에 관한 것이다.An embodiment of the present invention relates to a secondary battery equipped with a protection circuit module.
이차전지는 일차전지와 달리 충전과 방전을 반복적으로 수행할 수 있다. 일반적으로 소용량의 이차전지는 주로 휴대폰, 노트북, 캠코더 등과 같이 휴대하기 용이한 전자기기에 이용되고 대용량의 이차전지는 전기자동차 등에 이용될 수 있다.Unlike the primary battery, the secondary battery can perform charging and discharging repeatedly. In general, a small-capacity secondary battery is mainly used for portable electronic equipment such as a mobile phone, a notebook computer, a camcorder, etc., and a large-capacity secondary battery can be used for electric vehicles and the like.
한편 이러한 이차전지에는 과방전, 과충전, 과전류 등으로부터 보호하여 이차전지의 폭발을 방지하고 내구성을 개선하며 고성능을 유지하기 위한 보호회로모듈(Protection Circuit Module, PCM)이 장착된다. 보호회로모듈은 흔히 용접에 의해 결합될 수 있는데 상기 역할을 효과적으로 수행하기 위해 안정적으로, 그리고 확실하게 용접되는 것이 중요하다.Meanwhile, the secondary battery is equipped with a protection circuit module (PCM) for protecting the secondary battery from explosion, durability, and high performance by protecting the secondary battery from over discharge, overcharge, overcurrent, Protection circuit modules can often be joined by welding, and it is important that they are welded stably and reliably in order to effectively perform this role.
이러한 발명의 배경이 되는 기술에 개시된 정보는 본 발명의 배경에 대한 이해도를 향상시키기 위한 것일 뿐이다. 따라서 종래 기술을 구성하지 않는 정보를 포함할 수도 있다.The information disclosed in the background of the present invention is only intended to improve the understanding of the background of the present invention. And therefore may include information that does not constitute the prior art.
본 발명의 실시예는 보호회로모듈이 안정적으로 용접될 수 있는 이차전지를 제공한다.An embodiment of the present invention provides a secondary battery in which a protection circuit module can be stably welded.
본 발명의 실시예에 따른 이차전지는 전극조립체, 상기 전극조립체로부터 인출되는 전극탭, 상기 전극조립체의 과방전을 방지하기 위한 마이크로칩, 상기 마이크로칩을 수용하는 케이스 및 전기 전도성 소재로 이루어져 상기 전극탭에 용접되되 상기 케이스에 1점 지지되어 상기 마이크로칩에 전기적으로 연결되는 용접부를 포함할 수 있다.A secondary battery according to an embodiment of the present invention includes an electrode assembly, an electrode tab extended from the electrode assembly, a microchip for preventing overdischarge of the electrode assembly, a case accommodating the microchip, and an electrically conductive material, And a welding portion that is welded to the tab and is supported at one point on the case and electrically connected to the microchip.
또한 상기 케이스에는 어느 한 측면으로부터 내부로 함몰되어 상면으로부터 하면으로 이어지는 함몰부가 형성되고, 상기 용접부는 상기 케이스의 하면상에서 상기 함몰부에 상응하는 면적으로 형성되며, 전기 전도성 소재로 이루어지고 상기 용접부로부터 어느 한 방향으로 연장되어 상기 보호회로모듈의 하면에 부착되며 상기 마이크로칩에 전기적으로 연결됨으로써, 상기 용접부가 상기 케이스에 1점 지지되어 상기 마이크로칩에 전기적으로 연결되게 하는 부착부를 더 포함할 수 있다.The case is formed with a depression which is recessed from one side to the inside and is connected to the lower surface from the upper surface to the lower surface. The welding portion is formed on the lower surface of the case to have an area corresponding to the depression, and is made of an electrically conductive material. And a mounting portion which is extended in any one direction and is attached to a lower surface of the protection circuit module and is electrically connected to the microchip so that the welding portion is supported by the case at one point to be electrically connected to the microchip .
또한 상기 용접부와 상기 부착부는 일체로 형성될 수 있다.The welding portion and the attaching portion may be integrally formed.
또한 상기 부착부는 상기 용접부로부터, 상기 함몰부가 함몰된 방향으로 연장될 수 있다.Further, the attachment portion may extend from the welded portion in a direction in which the depression is recessed.
또한 상기 용접부에는 복수 개의 용접점이 마련되고, 상기 복수 개의 용접점 사이에 홀이 형성될 수 있다.The welding portion may be provided with a plurality of welding points, and holes may be formed between the plurality of welding points.
또한 상기 홀은 상기 복수 개의 용접점 중 임의의 두 용접점을 연결하는 직선상에 배치될 수 있다.Further, the hole may be disposed on a straight line connecting any two welding points among the plurality of welding points.
또한 상기 홀은 상기 직선을 가로지르는 방향으로 연장되게 형성될 수 있다.Further, the hole may be formed to extend in a direction transverse to the straight line.
본 발명의 실시예는 보호회로모듈의 용접부가 케이스에 캔틸레버 형태로 지지되어 끝단이 케이스에 대해 상하로 소정의 유동을 할 수 있기 때문에 압박에 의해 전지셀의 전극탭에 긴밀하게 접촉되도록 변형될 수 있다. 이에 전극탭과 용접부가 긴밀하게 접촉된 상태로 용접함으로써 용접 효율을 개선할 수 있다.Since the welding portion of the protection circuit module is supported on the case in the form of a cantilever so that the tip can be moved up and down with respect to the case, the protection circuit module can be deformed to come into tight contact with the electrode tab of the battery cell have. Therefore, the welding efficiency can be improved by welding the electrode tab and the welded portion in a state of being in tight contact with each other.
또한 용접부에 복수 개의 용접점이 마련될 경우 각 용접점 사이에 홀이 형성됨으로써 어느 한 용접점으로부터 다른 용접점으로 열이 전도되는 것을 가급적 방지할 수 있다. 이에 모든 용접점에 비교적 비슷한 열이 가해지게 함으로써 용접 품질을 개선할 수 있다.In addition, when a plurality of welding points are provided in the welding portion, holes are formed between the welding points so that the heat can be prevented from being conducted from one welding point to another welding point as much as possible. The welding quality can be improved by applying comparatively similar heat to all welding points.
도 1은 본 발명의 일 실시예에 따른 이차전지의 사시도이다.1 is a perspective view of a secondary battery according to an embodiment of the present invention.
도 2는 본 발명의 일 실시예에 따른 이차전지의 보호회로모듈의 사시도이다.2 is a perspective view of a protection circuit module of a secondary battery according to an embodiment of the present invention.
도 3은 본 발명의 일 실시예에 따른 이차전지의 보호회로모듈의 평면도이다.3 is a plan view of a protection circuit module of a secondary battery according to an embodiment of the present invention.
도 4는 본 발명의 일 실시예에 따른 이차전지의 보호회로모듈의 저면도이다.4 is a bottom view of a protection circuit module of a secondary battery according to an embodiment of the present invention.
도 5는 본 발명의 일 실시예에 따른 이차전지의 보호회로모듈의 단면도이다.5 is a cross-sectional view of a protection circuit module of a secondary battery according to an embodiment of the present invention.
도 6은 본 발명의 일 실시예에 따른 이차전지의 보호회로모듈의 변형예의 저면도이다.6 is a bottom view of a modification of the protection circuit module of a secondary battery according to an embodiment of the present invention.
도 7은 본 발명의 일 실시예에 따른 이차전지의 전지셀을 지그 위에 배치하는 과정을 도시한 것이다.FIG. 7 illustrates a process of disposing a battery cell of a secondary battery according to an embodiment of the present invention on a jig.
도 8은 본 발명의 일 실시예에 따른 이차전지의 보호회로모듈을 전지셀 위에 배치하여 압박하는 과정을 도시한 것이다.FIG. 8 illustrates a process of disposing and pressing a protection circuit module of a secondary battery according to an embodiment of the present invention on a battery cell.
도 9는 본 발명의 일 실시예에 따른 이차전지의 전지셀과 보호회로모듈을 용접하는 과정을 도시한 것이다.FIG. 9 illustrates a process of welding a battery cell and a protection circuit module of a secondary battery according to an embodiment of the present invention.
도 10은 본 발명의 다른 실시예에 따른 이차전지의 보호회로모듈의 평면도이다.10 is a plan view of a protection circuit module of a secondary battery according to another embodiment of the present invention.
도 11은 본 발명의 다른 실시예에 따른 이차전지의 보호회로모듈의 변형예의 평면도이다.11 is a plan view of a modification of the protection circuit module of a secondary battery according to another embodiment of the present invention.
이하 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세하게 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 발명의 실시예는 당해 기술 분야에서 통상의 지식을 가진 자에게 본 발명의 사상을 보다 완전하게 설명하여 전달하기 위해 제공되는 것으로 각 실시예는 여러 가지 다른 형태로 변형될 수 있으며 본 발명의 범위가 그 실시예로 한정되는 것은 아니다.It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed to the person skilled in the art. The present invention is not limited to these embodiments.
또한 도면에서 일부 요소의 크기나 두께는 설명의 편의를 위해, 또한 이해의 편의를 위해 다소 과장될 수 있다. 한편 도면에서 동일한 부호는 동일한 요소를 지칭한다.Also, the size and thickness of some elements in the drawings may be somewhat exaggerated for convenience of explanation and for convenience of understanding. In the figures, the same reference numerals are used for the same elements.
본 명세서에서 사용되는 "및/또는"이라는 용어는 열거된 항목들 중 어느 하나 및 하나 이상의 모든 조합을 포함한다. 또한 본 명세서에서 사용되는 "연결된다"라는 말은 A 부재와 B 부재가 직접적으로 연결되는 경우뿐만 아니라 A 부재와 B 부재 사이에 C 부재가 개재되어 A 부재와 B 부재가 C 부재를 통해 간접적으로 연결되는 경우도 포함하는 것으로 해석된다.As used herein, the term " and / or " includes any and all combinations of one or more of the listed items. As used herein, the term " connected " means not only when the member A and the member B are directly connected but also when the member C is interposed between the member A and the member B and the member A and the member B are indirectly It is interpreted to include the case of connection.
그밖에 본 명세서에서 사용되는 용어는 특정한 실시예를 구체적으로 설명하기 위한 것으로 본 발명을 제한하지 않는다. 본 명세서에서 사용되는 단수의 형태는 문맥상 다른 경우를 명백하게 지적하지 않는 한 복수의 형태를 포함할 수 있다. 또한 본 명세서에서 사용되는 "포함한다(comprise, include)" 및/또는 "포함하는(comprising, including)"이라는 말은 언급된 형상, 숫자, 단계, 동작, 부재, 요소 및/또는 이들 그룹의 존재를 특정하는 것으로 하나 이상의 다른 형상, 숫자, 동작, 부재, 요소 및/또는 이들 그룹의 존재 또는 부가를 배제하지 않는다.In addition, the terms used in the specification are intended to specifically illustrate specific embodiments and are not intended to limit the present invention. The singular forms as used herein may include a plurality of forms unless the context clearly dictates otherwise. It is also to be understood that the word " comprise, " and / or " comprising ", as used herein, Numbers, operations, elements, elements and / or the presence or addition of one or more of the other features, numbers, operations, elements, elements, and / or groups thereof.
본 명세서에서 제1, 제2 등의 용어가 다양한 부재, 부품, 영역, 층 및/또는 부분을 설명하기 위해 사용되지만 이들 부재, 부품, 영역, 층 및/또는 부분이 그 용어에 의해 한정되어서는 안 된다. 이는 어느 한 부재, 부품, 영역, 층 또는 부분을 다른 한 부재, 부품, 영역, 층 또는 부분과 구별하기 위해 사용된다. 따라서 이를테면 제1 부재, 부품, 영역, 층 또는 부분은 본 발명으로부터 벗어나지 않는 범위 내에서 제2 부재, 부품, 영역, 층 또는 부분으로 지칭될 수 있다.Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or sections, it is to be understood that these elements, components, regions, layers and / Can not be done. It is used to distinguish one element, component, region, layer or section from another, member, component, region, layer or section. Thus, for example, a first member, component, region, layer or section may be referred to as a second member, component, region, layer or section without departing from the invention.
도면에 도시된 어느 한 요소 또는 특징과 다른 한 요소 또는 특징의 명확한 이해를 위해 "하부(beneath)", "아래(below)", "낮은(lower)", "상부(above)" 또는 "위(upper)"와 같이 공간에 관한 용어가 사용될 수 있다. 이러한 공간에 관한 용어는 본 발명의 다양한 공정 상태 또는 사용 상태에 따라 본 발명의 명확한 이해를 위한 것으로 본 발명을 한정하지 않는다. 예를 들어 어느 한 요소 또는 특징이 뒤집어지면 "하부" 또는 "아래"로 설명된 요소 또는 특징은 "상부" 또는 "위"로 이해된다. 결국 "하부"는 "상부" 또는 "위"를 포괄하는 개념이다.Beneath, " " below, " " lower, " " above, " or " above, "quot; upper " can be used. The term for such a space is not intended to limit the present invention for a clear understanding of the present invention depending on various process states or conditions of use of the present invention. For example, when an element or feature is inverted, the element or feature described as " lower " or " below " As a result, "lower" is a concept that includes "upper" or "upper".
도 1은 본 발명의 일 실시예에 따른 이차전지(100)의 사시도로서 전지셀(110)과 보호회로모듈(120)이 분리된 상태를 도시한 것이다.FIG. 1 is a perspective view of a secondary battery 100 according to an embodiment of the present invention, in which a battery cell 110 and a protection circuit module 120 are separated.
도 1을 참조하면 이차전지(100)는 전지셀(110)과 보호회로모듈(120)을 포함한다.Referring to FIG. 1, a secondary battery 100 includes a battery cell 110 and a protection circuit module 120.
전지셀(110)은 양극판, 음극판 및 양극판과 음극판 사이에 개재된 세퍼레이터로 이루어진 전극조립체(미도시), 전극조립체를 수용하는 커버(111), 전극조립체의 양극판과 음극판으로부터 각각 인출된 양극탭과 음극탭(이하 "전극탭"라 통칭함)(112) 등을 포함하는 일반적인 구성을 갖는다. 따라서 전지셀(110) 그 자체의 구체적인 구성은 공지된 바와 같으므로 이에 대한 상세한 설명은 생략한다.The battery cell 110 includes an electrode assembly (not shown) composed of a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate, a cover 111 for housing the electrode assembly, a positive electrode tab A negative electrode tab (hereinafter collectively referred to as " electrode tab ") 112, and the like. Therefore, detailed description of the battery cell 110 itself is omitted because it is well known in the art.
또한 도면에서 전지셀(110)은 이른바 파우치형으로 형성되는 것으로 도시되어 있다. 그러나 본 발명에서 전지셀(110)이 반드시 파우치형으로 형성되어야 하는 것은 아니고 각형 또는 그밖에 다른 타입으로 형성될 수도 있다. 다만 이하에서는 이해의 편의상 도면에 도시된 바와 같이 전지셀(110)이 파우치형으로 형성되는 것으로 예를 들어 설명한다.Also, in the drawing, the battery cell 110 is shown as being formed in a so-called pouch type. However, in the present invention, the battery cell 110 is not necessarily formed in a pouch-like shape, but may be formed in a square or other type. Hereinafter, the battery cell 110 will be described in the form of a pouch as shown in the figure for convenience of understanding.
보호회로모듈(120)은 전지셀(110)의 과방전, 과충전, 과전류 등을 방지하는 역할을 한다. 이러한 보호회로모듈(120)은 상기 역할을 수행하기 위한 마이크로칩(121)(도 5 참조), 마이크로칩(121)을 수용하는 케이스(122) 및 용접부(123)와 부착부(124)로 이루어진 연결탭을 포함한다.The protection circuit module 120 prevents overdischarge, overcharge, overcurrent, and the like of the battery cell 110. The protection circuit module 120 includes a microchip 121 (see FIG. 5) for performing the above-mentioned function, a case 122 for accommodating the microchip 121, and a welding portion 123 and an attaching portion 124 Contains the Connect tab.
보다 구체적으로 도 2는 본 발명의 일 실시예에 따른 이차전지(100)의 보호회로모듈(120)의 사시도로서 도 1과 다른 각도에서 바라본 모습을 도시한 것이다. 가령 도 1이 보호회로모듈(120)을 위에서 바라본 모습이라면 도 2는 보호회로모듈(120)을 아래에서 바라본 모습이다. 또한 도 3은 본 발명의 일 실시예에 따른 이차전지(100)의 보호회로모듈(120)의 평면도이고, 도 4는 본 발명의 일 실시예에 따른 이차전지(100)의 보호회로모듈(120)의 저면도이다. 또한 도 5는 본 발명의 일 실시예에 따른 이차전지(100)의 보호회로모듈(120)의 단면도로서 도 3의 A-A 선에 의한 것이다.More specifically, FIG. 2 is a perspective view of a protection circuit module 120 of a secondary battery 100 according to an embodiment of the present invention, which is viewed from an angle different from FIG. 1. 2 is a view of the protection circuit module 120 as viewed from below, if the protection circuit module 120 is viewed from above. 3 is a plan view of a protection circuit module 120 of a secondary battery 100 according to an embodiment of the present invention. FIG. 4 is a plan view of a protection circuit module 120 of a secondary battery 100 according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of a protection circuit module 120 of a secondary battery 100 according to an embodiment of the present invention, and is taken on line A-A of FIG.
도 2 내지 5를 더 참조하면 보호회로모듈(120)의 케이스(122)에는 어느 한 측면으로부터 내부로 오목하게 함몰되는 함몰부(122A)가 형성된다. 이때 함몰부(122A)는 케이스(122)의 상면으로부터 하면으로 이어지게 형성된다.2 to 5, the case 122 of the protection circuit module 120 is formed with a depression 122A which is recessed from one side to the inside. At this time, the depressed portion 122A is formed so as to extend from the upper surface to the lower surface of the case 122.
또한 함몰부(122A)는 쌍으로 형성되어 특정한 간격으로 이격된다. 여기서 두 함몰부(122A) 중 하나는 전지셀(110)의 양극탭과 용접부(123)를 용접하는 데에 활용되는 부분이고 다른 하나는 전지셀(110)의 음극탭과 용접부(123)를 용접하는 데에 활용되는 부분인데 이에 대해서는 후술한다. 그러므로 두 함몰부(122A) 사이의 간격은 전지셀(110)의 양극탭과 음극탭 사이의 간격에 상응한다.The depressions 122A are formed in pairs and spaced apart at specific intervals. One of the two depressions 122A is used to weld the positive electrode tab of the battery cell 110 and the welded portion 123 and the other is used to weld the negative electrode tab and the welded portion 123 of the battery cell 110 Which will be described later. Therefore, the interval between the two depressions 122A corresponds to the interval between the positive electrode tab and the negative electrode tab of the battery cell 110. [
연결탭은 앞서 언급한 바와 같이 용접부(123)와 부착부(124)로 이루어져 용접부(123)가 전지셀(110)의 전극탭(112)에 용접되고 부착부(124)가 케이스(122)의 하면에 부착됨으로써 전극탭(112)과 마이크로칩(121)을 전기적으로 연결한다.The connection tab is composed of the welding part 123 and the attaching part 124 so that the welding part 123 is welded to the electrode tab 112 of the battery cell 110 and the attaching part 124 is welded to the case 122 So that the electrode tab 112 and the microchip 121 are electrically connected to each other.
보다 구체적으로 용접부(123)는 적절한 탄성을 갖는 전기 전도성 소재로 이루어진다. 또한 용접부(123)는 전체적으로 판 형상으로 형성된다. 특히 용접부(123)는 케이스(122)의 하면상에서 함몰부(122A)에 상응하는 면적으로 형성되어 배치된다. 가령 도면에 도시된 바와 같이 함몰부(122A)가 대체적으로 사각형의 윤곽을 가지면서 내부로 오목하게 함몰된다면 용접부(123)도 사각형의 판 형상으로 형성되어 그 윤곽에 상응하게 배치된다. 만약 함몰부(122A)가 대체적으로 반원형의 윤곽을 가지면서 내부로 오목하게 함몰된다면 용접부(123)는 반원형 또는 원형의 판 형상으로 형성될 수 있다.More specifically, the welding portion 123 is made of an electrically conductive material having appropriate elasticity. The welding portion 123 is formed in a plate shape as a whole. Particularly, the welded portion 123 is formed on the lower surface of the case 122 in an area corresponding to the depression 122A. For example, as shown in the drawing, if the depressed portion 122A has a generally rectangular outline and is concaved inward, the welded portion 123 is also formed in a rectangular plate shape, and is disposed corresponding to the outline. If the depressed portion 122A has a generally semicircular contour and is recessed inward, the welded portion 123 may be formed in a semicircular or circular plate shape.
부착부(124)도 적절한 탄성을 갖는 전기 전도성 소재로 이루어진다. 또한 부착부(124)는 용접부(123)로부터 어느 한 방향으로 연장되어 케이스(122)의 하면에 부착된다. 예컨대 부착부(124)는 솔더링에 의해 케이스(122)의 하면에 부착될 수 있다.The attachment portion 124 is also made of an electrically conductive material having appropriate elasticity. The attachment portion 124 is attached to the lower surface of the case 122 by extending in one direction from the welded portion 123. For example, the attachment portion 124 may be attached to the lower surface of the case 122 by soldering.
이러한 용접부(123)와 부착부(124)는 일체로 형성될 수도 있고 별개로 형성되어 서로 결합될 수도 있다. 아무튼 이에 따르면 용접부(123)가 부착부(124)를 통해 케이스(122)에 1점 지지된다. 다시 말해 용접부(123)가 부착부(124)를 통해 케이스(122)에 마치 캔틸레버 형태로 지지된다. 따라서 용접부(123) 중 부착부(124)로부터 먼 끝단이 케이스(122)에 대해 상하로 소정의 유동을 할 수 있게 된다.The welding portion 123 and the attaching portion 124 may be integrally formed or separately formed and joined to each other. The welding portion 123 is supported at one point on the case 122 through the attachment portion 124. [ In other words, the welding portion 123 is supported by the case 122 in the form of a cantilever through the attachment portion 124. Therefore, a distal end of the welded portion 123, which is remote from the attaching portion 124, can move up and down with respect to the case 122.
이를 위해 도 4에서 부착부(124)는 용접부(123)로부터, 함몰부(122A)가 오목하게 함몰된 방향으로 연장되어 케이스(122)의 하면에 부착되는 것으로 도시되어 있다. 그러나 이는 단순한 예시에 불과하다. 용접부(123)가 부착부(124)를 통해 케이스(122)에 캔틸레버 형태로 지지될 수만 있다면, 따라서 부착부(124)로부터 먼 끝단이 케이스(122)에 대해 상하로 소정의 유동을 할 수만 있다면 부착부(124)는 다른 방향으로 연장될 수도 있다. 이를테면 부착부(124')는 도 6에 도시된 바와 같이 함몰부(122A)가 오목하게 함몰된 방향을 가로지르는 방향으로 연장되어 케이스(122)의 하면에 부착될 수도 있다.4, the attachment portion 124 is shown extending from the welded portion 123 in a direction in which the depression 122A is recessed and attached to the lower surface of the case 122. As shown in FIG. However, this is a mere example. If the welding portion 123 can be supported in the form of a cantilever in the case 122 through the attachment portion 124 and therefore the distal end remote from the attachment portion 124 can move up and down with respect to the case 122 The attachment portion 124 may extend in another direction. For example, the attachment portion 124 'may be attached to the lower surface of the case 122 by extending in a direction transverse to the concave depression of the depression 122A as shown in FIG.
이상으로 설명한 전지셀(110)과 보호회로모듈(120)의 구조에 기초하여 이하에서는 전지셀(110)에 보호회로모듈(120)을 장착하는 방법에 대해 설명한다.A method of mounting the protection circuit module 120 on the battery cell 110 will be described below based on the structure of the battery cell 110 and the protection circuit module 120 described above.
도 7 내지 9는 본 발명의 일 실시예에 따른 이차전지(100)의 전지셀(110)에 보호회로모듈(120)을 장착하는 방법을 도시한 것으로, 도 7은 전지셀(110)을 지그(J) 위에 배치하는 과정이고, 도 8은 보호회로모듈(120)을 전지셀(110) 위에 배치하여 압박하는 과정이며, 도 9는 전지셀과 보호회로모듈을 용접하는 과정이다.7 to 9 illustrate a method of mounting a protection circuit module 120 on a battery cell 110 of a secondary battery 100 according to an embodiment of the present invention. FIG. 8 is a process of disposing the protection circuit module 120 on the battery cell 110, and FIG. 9 is a process of welding the battery cell and the protection circuit module.
먼저 도 7에 도시된 바와 같이 용접용 지그(J) 위에 전지셀(110)의 전극탭(112)을 배치한다.First, the electrode tab 112 of the battery cell 110 is disposed on the welding jig J as shown in FIG.
다음으로 도 8에 도시된 바와 같이 전극탭(112) 위에 보호회로모듈(120)을 배치한다. 보다 구체적으로 보호회로모듈(120)의 케이스(122)의 하면이 전극탭(112)을 바라보게 배향하여 보호회로모듈(120)의 용접부(123)가 전극탭(112)에 접촉되게 한다.Next, the protection circuit module 120 is disposed on the electrode tab 112 as shown in FIG. The lower surface of the case 122 of the protection circuit module 120 is oriented so as to face the electrode tab 112 so that the welding portion 123 of the protection circuit module 120 contacts the electrode tab 112.
이때 보호회로모듈(120)은 구조적 특성상 마이크로칩(121)의 실장으로 인해 케이스(122)의 하면이 완전하게 평탄하지 않고 일부 굴곡질 수 있다. 이에 전극탭(112) 위에 보호회로모듈(120)을 배치했을 때 용접부(123)가 전극탭(112)에 긴밀하게 접촉되지 못할 수 있다. 그러면 용접 시 용접 효율이 저하될 수 있는 문제점이 있다.At this time, the protective circuit module 120 is not completely flat on the lower surface of the case 122 due to the mounting of the microchip 121 due to its structural characteristics, and may be partially bent. Therefore, when the protection circuit module 120 is disposed on the electrode tab 112, the welded portion 123 may not be brought into close contact with the electrode tab 112. There is a problem that welding efficiency may be lowered during welding.
따라서 도 8에 도시된 바와 같이 용접부(123) 중 부착부(124)로부터 먼 끝단을 화살표 방향으로 압박함으로써 용접부(123)가 전극탭(112)에 긴밀하게 접촉되게 한다. 용접부(123)는 앞서 설명한 바와 같이 부착부(124)를 통해 케이스(122)에 캔틸레버 형태로 지지되어 부착부(124)로부터 먼 끝단이 케이스(122)에 대해 상하로 소정의 유동을 할 수 있기 때문에 케이스(122)의 하면이 일부 굴곡지더라도 전술한 압박에 의해 전극탭(112)에 긴밀하게 접촉되도록 변형될 수 있다.Therefore, as shown in FIG. 8, the end of the welded portion 123 far from the attachment portion 124 is pressed in the direction of the arrow so that the welded portion 123 is brought into tight contact with the electrode tab 112. The welded portion 123 is supported in the form of a cantilever on the case 122 through the attaching portion 124 as described above so that the distal end far from the attaching portion 124 can make a predetermined flow upward and downward with respect to the case 122 The lower surface of the case 122 can be deformed so as to be in tight contact with the electrode tab 112 by the aforementioned pressing even if it is partially bent.
이에 도 9에 도시된 바와 같이 보호회로모듈(120)의 함몰부(122A)를 통해 용접부(123)에 레이저를 조사하여 전극탭(112)과 용접부(123)을 서로 용접함으로써 상기 문제점을 해결하여 용접 효율이 향상될 수 있다.9, the problem is solved by irradiating a laser beam to the welded portion 123 through the depression 122A of the protective circuit module 120 to weld the electrode tab 112 and the welded portion 123 together The welding efficiency can be improved.
도 10은 본 발명의 다른 실시예에 따른 이차전지(200)의 보호회로모듈(220)의 평면도이다.10 is a plan view of a protection circuit module 220 of a secondary battery 200 according to another embodiment of the present invention.
앞서 도 1 내지 9를 참조하여 설명한 본 발명의 일 실시예에 따른 이차전지(100)의 보호회로모듈(120)과 비교할 때, 본 발명의 다른 실시예에 따른 이차전지(200)의 보호회로모듈(220)은 용접부(223)에 홀(223A)이 형성되는 차이점이 있다. 그밖에 다른 사항은 본 발명의 일 실시예에 따른 이차전지(100)의 보호회로모듈(120)과 실절적으로 동일하며, 혹 상이한 부분이 있더라도 통상의 기술자라면 상기 차이점에 대응하여 당연히 변형할 것으로 예상되는 정도에 불과할 것이므로 이에 대한 중복적인 설명은 생략한다.In comparison with the protection circuit module 120 of the secondary battery 100 according to the embodiment of the present invention described above with reference to FIGS. 1 to 9, the protection circuit module 120 of the secondary battery 200 according to another embodiment of the present invention, (220) has a hole (223A) formed in the welded portion (223). Other matters are substantially the same as those of the protection circuit module 120 of the secondary battery 100 according to an embodiment of the present invention. Even if there is a difference, And therefore, a duplicate description thereof will be omitted.
보다 구체적으로 도 10을 참조하면 전지셀(110)의 전극탭(112)과 보호회로모듈(220)의 용접부(223)의 결합력을 개선하기 위해 용접부(223)에 복수 개의 용접점, 예컨대 제1 용접점(P1)과 제2 용접점(P2)이 마련될 수 있다.10, in order to improve the bonding force between the electrode tab 112 of the battery cell 110 and the welding portion 223 of the protection circuit module 220, a plurality of welding points, for example, A welding point P1 and a second welding point P2 may be provided.
그러나 제1 용접점(P1)이 먼저 용접되고 제2 용접점(P2)이 그 다음으로 용접된다고 가상할 때, 만약 제1 용접점(P1)이 용접되는 동안 그 용접으로 인해 발생한 열이 제2 용접점(P2)으로 전도된다면, 제1 용접점(P1)과 제2 용접점(P2)에 동일한 강도의 레이저를 각각 조사할 경우 제1 용접점(P1)보다 제2 용접점(P2)에 결과적으로 더 많은 열이 가해지게 된다. 그러므로 제1 용접점(P1)과 제2 용접점(P2)에서 용접 비드가 서로 다르게 형성되고 그 용접 강도도 서로 다르게 나타날 것이다. 따라서 용접 품질이 저하될 수 있는 문제점이 있다.However, when it is assumed that the first welding point P1 is first welded and the second welding point P2 is welded next, if the heat generated by the welding during the welding of the first welding point P1 is the second When the first welding point P1 and the second welding point P2 are irradiated with the laser of the same intensity respectively, the first welding point P1 and the second welding point P2 are welded to the welding point P2, As a result, more heat is applied. Therefore, the weld beads will be formed differently at the first welding point P1 and the second welding point P2, and the welding strengths will be different from each other. Therefore, there is a problem that the welding quality may be deteriorated.
이를 방지하기 위해 용접부(223)에는 각 용접점(P1, P2) 사이에 홀(223A)이 형성된다. 이에 의하면 제1 용접점(P1)으로부터 제2 용접점(P2)으로 열이 전도될 수 있는 경로가 홀(223A)에 의해 일부 차단되어 줄어들기 때문에 열이 전도되는 정도도 줄어든다. 그러므로 제1 용접점(P1)이 먼저 용접되고 제2 용접점(P2)이 그 다음으로 용접될 때 제1 용접점(P1)과 제2 용접점(P2)에 비교적 비슷한 열이 가해지게 된다. 따라서 상기 문제점을 해결하여 용접 품질이 향상될 수 있다.In order to prevent this, a hole 223A is formed in the welding portion 223 between the welding points P1 and P2. According to this, since the path through which heat can be conducted from the first welding point P1 to the second welding point P2 is partially cut off by the hole 223A, the degree of heat conduction is also reduced. Therefore, a relatively similar heat is applied to the first welding point P1 and the second welding point P2 when the first welding point P1 is first welded and the second welding point P2 is welded next. Accordingly, the above problems can be solved and the welding quality can be improved.
특히 제1 용접점(P1)으로부터 제2 용접점(P2)으로 열이 전도되는 것을 보다 효과적으로 방지하기 위해 홀(223A)은 제1 용접점(P1)과 제2 용접점(P2)을 연결하는 가상의 직선상에 배치될 수 있다. 또한 홀(223A)은 그 가상의 직선을 가로지르는 방향을 따라 연장되게 형성될 수 있다.Particularly, in order to more effectively prevent heat from being conducted from the first welding point P1 to the second welding point P2, the hole 223A connects the first welding point P1 and the second welding point P2 And can be arranged on a virtual straight line. Also, the hole 223A may be formed to extend along the imaginary straight line.
이러한 홀(223A)의 구체적인 형상이나 면적은 용접점의 개수, 배열, 용접부(223)의 강도 등에 따라 달라질 수 있다. 만약 네 개의 용접점, 예컨대 제1 용접점(P1), 제2 용접점(P2), 제3 용접점(P3) 및 제4 용접점(P4)이 형성되어 사각형의 꼭지점 형태로 배열된다면 홀(223A')은 도 11에 도시된 바와 같이 상기 용접점(P1, P2, P3, P4)의 가운데에서 십자형으로 형성될 수 있다. 물론 이 역시 단순한 예시에 불과하며 필요에 따라 얼마든지 달라질 수 있을 것이다.The specific shape and area of the hole 223A may vary depending on the number and arrangement of welding points, the strength of the welding portion 223, and the like. If four welding points, for example a first welding point P1, a second welding point P2, a third welding point P3 and a fourth welding point P4 are formed and arranged in the form of a vertex of a quadrangle, 223A 'may be formed in a cross shape at the center of the welding points P1, P2, P3, P4 as shown in FIG. Of course, this is a mere example, and it can be changed as needed.
이상의 설명은 본 발명에 따른 이차전지를 실시하기 위한 하나의 실시예에 불과한 것으로 본 발명은 상기 실시예에 한정되지 않고 이하의 청구범위에서 청구하는 바와 같이 본 발명의 요지를 벗어남 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형 실시가 가능한 범위까지 본 발명의 기술적 정신이 있다 할 것이다.It is to be understood that the present invention is not limited to the above-described embodiment, and that various modifications and changes may be made without departing from the scope of the present invention as defined in the following claims. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
100: 이차전지100: secondary battery
110: 전지셀110: Battery cell
111: 커버111: cover
112: 전극탭112: electrode tab
120: 보호회로모듈120: Protection circuit module
121: 마이크로칩121: Microchip
122: 케이스122: Case
123: 용접부123:
124: 부착부124:

Claims (7)

  1. 전극조립체,Electrode assembly,
    상기 전극조립체로부터 인출되는 전극탭,An electrode tab extending from the electrode assembly,
    상기 전극조립체의 과방전을 방지하기 위한 마이크로칩,A microchip for preventing overdischarge of the electrode assembly,
    상기 마이크로칩을 수용하는 케이스 및A case for accommodating the microchip and
    전기 전도성 소재로 이루어져 상기 전극탭에 용접되되 상기 케이스에 1점 지지되어 상기 마이크로칩에 전기적으로 연결되는 용접부를 포함하는 이차전지.And a welded portion formed of an electrically conductive material and being welded to the electrode tab, and being supported at one point on the case and electrically connected to the microchip.
  2. 제1항에 있어서,The method according to claim 1,
    상기 케이스에는 어느 한 측면으로부터 내부로 함몰되어 상면으로부터 하면으로 이어지는 함몰부가 형성되고,The case is formed with a depression that sinks from one side to the inside and extends from the upper surface to the lower surface,
    상기 용접부는 상기 케이스의 하면상에서 상기 함몰부에 상응하는 면적으로 형성되며,The welding portion is formed on the lower surface of the case to have an area corresponding to the depression,
    전기 전도성 소재로 이루어지고 상기 용접부로부터 어느 한 방향으로 연장되어 상기 보호회로모듈의 하면에 부착되며 상기 마이크로칩에 전기적으로 연결됨으로써, 상기 용접부가 상기 케이스에 1점 지지되어 상기 마이크로칩에 전기적으로 연결되게 하는 부착부를 더 포함하는 이차전지.The microchip is made of an electrically conductive material and extends in any direction from the welded portion to be attached to the lower surface of the protective circuit module and electrically connected to the microchip, whereby the welded portion is supported by the case at one point, And an attaching portion for attaching the battery to the battery.
  3. 제2항에 있어서,3. The method of claim 2,
    상기 용접부와 상기 부착부는 일체로 형성되는 이차전지.Wherein the welding portion and the attaching portion are integrally formed.
  4. 제2항에 있어서,3. The method of claim 2,
    상기 부착부는 상기 용접부로부터, 상기 함몰부가 함몰된 방향으로 연장되는 이차전지.Wherein the attachment portion extends from the welded portion in a direction in which the depression is recessed.
  5. 제1항에 있어서,The method according to claim 1,
    상기 용접부에는 복수 개의 용접점이 마련되고, 상기 복수 개의 용접점 사이에 홀이 형성되는 이차전지.Wherein the welding portion is provided with a plurality of welding points, and a hole is formed between the plurality of welding points.
  6. 제5항에 있어서,6. The method of claim 5,
    상기 홀은 상기 복수 개의 용접점 중 임의의 두 용접점을 연결하는 직선상에 배치되는 이차전지.Wherein the hole is disposed on a straight line connecting any two welding points among the plurality of welding points.
  7. 제6항에 있어서,The method according to claim 6,
    상기 홀은 상기 직선을 가로지르는 방향으로 연장되게 형성되는 이차전지.And the hole extends in a direction transverse to the straight line.
PCT/KR2018/007781 2017-10-23 2018-07-10 Secondary battery WO2019083124A1 (en)

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