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WO2018052214A1 - Secondary battery and production method therefor - Google Patents

Secondary battery and production method therefor Download PDF

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Publication number
WO2018052214A1
WO2018052214A1 PCT/KR2017/009732 KR2017009732W WO2018052214A1 WO 2018052214 A1 WO2018052214 A1 WO 2018052214A1 KR 2017009732 W KR2017009732 W KR 2017009732W WO 2018052214 A1 WO2018052214 A1 WO 2018052214A1
Authority
WO
WIPO (PCT)
Prior art keywords
pouch
electrode assembly
terrace
secondary battery
folded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2017/009732
Other languages
French (fr)
Korean (ko)
Inventor
김보현
이종기
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung SDI Co Ltd
Original Assignee
Samsung SDI Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung SDI Co Ltd filed Critical Samsung SDI Co Ltd
Publication of WO2018052214A1 publication Critical patent/WO2018052214A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a pouch type secondary battery capable of increasing energy density and a method of manufacturing the same.
  • a secondary battery is a battery that can be charged and discharged unlike a primary battery that cannot be charged.
  • a portable electronic device such as a smartphone, a tablet computer, and a digital camera
  • a large-capacity battery in which tens or hundreds of battery cells are connected to a device, it is used as a power source for driving motors of electric bicycles, electric scooters, hybrid vehicles, and electric vehicles.
  • Secondary batteries are manufactured in various shapes, and typical shapes include square, cylindrical, and pouch types, and include an electrode assembly, an electrolyte solution, an electrode assembly, and the above-described electrode assembly, which are interposed between an anode plate and a cathode plate. It consists of a case which accommodates electrolyte solution.
  • the pouch-type battery has a form in which the electrode assembly is wrapped with a pouch in the upper and lower parts and sealed, and the volume is reduced by folding a sealing part for sealing.
  • a secondary battery having a higher energy density in a limited space is required.
  • the present invention provides a pouch type secondary battery capable of increasing energy density and a method of manufacturing the same.
  • a secondary battery includes: an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator formed therein, including an indentation recessed inward from at least one side, and including a pair of lead tabs drawn from the positive electrode plate and the negative electrode plate; And a pouch including a terrace formed by sealing the electrode assembly, wherein the pouch may be formed by folding the terrace in a region other than a region where the lead tab is drawn out.
  • the recess of the electrode assembly may be formed in a region other than the region where the lead tab is drawn out.
  • the pouch may further include a space that provides a space with respect to the electrode assembly in a region corresponding to the recess of the electrode assembly.
  • the pouch may further include an overlapping portion formed to overlap between the folding terrace portions, and the overlapping portion may be contacted by folding toward at least one surface of the terrace portion.
  • the pouch may be formed by folding inward from the one side edge toward the depression of the electrode assembly, and the terrace portion of the remaining area from which the lead tab is drawn out.
  • one side edge of the pouch may be formed by folding in a diagonal direction from the one edge toward the area corresponding to the depression of the electrode assembly.
  • the terrace portion is formed so that the adjacent pair is in contact with the central area of the one corner, it may be formed to be folded based on the boundary facing inward.
  • the pouch may further include a recess formed to correspond to the recess of the electrode assembly from the outside.
  • the terrace portion may be divided into regions based on the depression, and each of the terrace portions may be formed by being folded based on a boundary of the inner region.
  • the pouch may be formed to have a uniform width along the entire circumference including the electrode assembly.
  • the pouch may be formed by folding inward from the one side edge toward the corner of the at least one electrode assembly, and the terrace portion of the remaining area from which the lead tab is drawn out.
  • one side edge of the pouch may be formed to correspond to at least one adjacent side of the pouch formed irregularly along the electrode assembly, it may be formed by folding in a diagonal direction toward the inside of the pouch.
  • the secondary battery and a method of manufacturing the same according to the present invention can increase the energy density while maintaining the effect of the pouch sealing by accommodating an electrode assembly in which a recess is formed corresponding to the maximum area except for the area required to fold the terrace of the pouch.
  • FIG. 1 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.
  • FIGS. 2 to 4 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to an exemplary embodiment of the present invention.
  • 5 to 7 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to another exemplary embodiment of the present invention.
  • FIGS. 8 and 9 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to still another exemplary embodiment of the present invention.
  • 10 to 12 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to still another exemplary embodiment of the present invention.
  • Electrode assembly 100, 200, 300, 400; Secondary batteries 110 and 410; Electrode assembly
  • FIG. 1 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.
  • the secondary battery 100 may include an electrode assembly 110 and pouches 120 and 130 accommodating the electrode assembly.
  • the electrode assembly 110 may be configured in the form of a jelly roll in which the first electrode plate 111 and the second electrode plate 112 are wound with the separator 113 interposed therebetween, or stacked in one direction.
  • the first electrode plate 111 may be formed of a positive electrode plate
  • the second electrode plate 112 may be formed of a negative electrode plate. If necessary, the polarities of the electrode plates 111 and 112 may be changed.
  • the first electrode plate 111 is an anode
  • the second electrode plate 112 will be described as an example.
  • the first electrode plate 111 is formed by applying a first electrode active material such as a transition metal oxide to a first electrode current collector formed of a metal foil such as aluminum, and includes a non-coated portion that is a region where the first active material is not coated.
  • the uncoated portion provides a passage of current flow between the first electrode plate and the outside.
  • the range of this invention is not limited as a material of a said 1st electrode plate.
  • a first lead tab 114 may be formed on the uncoated portion of the first electrode plate.
  • the first lead tab 114 forms a path for inputting and outputting an electrical signal of the first electrode plate 111.
  • the second electrode plate 112 is formed by applying a second electrode active material such as graphite or carbon to a second electrode current collector formed of a metal foil such as copper or nickel, and includes an uncoated portion that is a region where the second active material is not coated. do.
  • a second electrode active material such as graphite or carbon
  • a second electrode current collector formed of a metal foil such as copper or nickel
  • a second lead tab 115 is formed on the uncoated portion of the second electrode plate 112 to form a path for inputting and outputting an electrical signal of the second electrode plate 112.
  • the separator 113 is positioned between the first electrode plate and the second electrode plate to prevent a short and to allow movement of lithium ions.
  • the separator may be made of polyethylene, polypropylene, or a composite film of polyethylene and polypropylene.
  • the range of this invention is not limited as a material of the said separator.
  • the electrode assembly 120 as described above is accommodated in the pouch 120 together with the electrolyte.
  • the electrolyte may be made of lithium salts such as LiPF 6 and LiBF 4 in organic solvents such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC).
  • EC ethylene carbonate
  • PC propylene carbonate
  • DEC diethyl carbonate
  • EMC ethyl methyl carbonate
  • DMC dimethyl carbonate
  • insulating members 116 and 117 may be coupled to the first side, which is an area where the first lead tab 114 and the second lead tab 115 are coupled to the pouch 120.
  • the insulating members 116 and 117 may electrically insulate the pouch 120 from the lead tabs 114 and 115.
  • the electrode assembly 110 may include a recess 110a formed by inserting a portion of the region into the second side opposite to the side where the lead tabs 114 and 115 are formed.
  • the depression 110a may be formed in a form in which some regions are removed from the second side of the electrode assembly 110.
  • the recess 110a may be formed at regions of both corners at which the electrode assembly 110 is inserted into the pouch 120.
  • the recess 110a may correspond to an overlapping area among areas where the terrace part of the pouch 120 is folded. Therefore, since the electrode assembly 110 may be formed to fill the inside of the pouch 120 in the remaining area except for the recess 110a corresponding to the overlapping area of the pouch 120, the pouch type Energy density of the secondary battery 100 can be increased.
  • the pouches 120 and 130 may be formed in a multilayered sheet structure surrounding the electrode assembly 110.
  • the pouches 120 and 130 form an inner surface and have a polymer sheet 10 that insulates and heat-seals, a polyethylene terephthalate (PET) sheet, a nylon sheet, or a PET-nylon composite sheet 11 (hereinafter, formed by protecting the outer surface).
  • PET polyethylene terephthalate
  • nylon sheet will be described as an example
  • the metal sheet 12 is interposed between the polymer sheet 10 and the nylon sheet 11, and may be formed of, for example, an aluminum sheet.
  • the pouches 120 and 130 may cover the first exterior member 120 accommodating the electrode assembly 110, the electrode assembly 110, and the first exterior member 120 outside the electrode assembly 110. It includes a second packaging material 130 which is heat-sealed to.
  • the first exterior member 120 and the second exterior member 130 may be formed of the polymer sheet 120a, the nylon sheet 120b, and the metal sheet 120c having the same structure, respectively.
  • the first exterior member 120 is formed in a concave structure to accommodate the electrode assembly 110
  • the second exterior member 130 is configured to accommodate the electrode assembly 110 accommodated in the first exterior member 120. It may be formed flat so as to cover it.
  • first exterior member 120 and the second exterior member 130 may be sealed in a state in which the electrode assembly 110 is accommodated, and the terrace portion formed according to this may be folded to form a final structure.
  • 2 to 4 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to an exemplary embodiment of the present invention.
  • 2 to 4 illustrate a plan view in a state in which the first exterior member 120 is positioned at the top and the second exterior member 130 is located at the bottom after the sealing of the pouch.
  • the corresponding region of the second sheath 130 is also intended to be folded together during the process.
  • the first exterior member 120 maintains its shape without being embedded in the first exterior member 120.
  • a space 121 to have a substantially rectangular shape.
  • the space 121 may be partially included toward the electrode assembly 110 in a folding process of the sealing region of the first exterior member 120, such that the electrode assembly 110 is deformed. Can be prevented.
  • the second exterior member 130 is also formed to have a circumferential shape corresponding to the first exterior member 120 for sealing, there is, of course, a region corresponding to the space 121.
  • the first to fourth terrace parts 120 are formed along the edges of the first and second terrace members 130 that are formed through the welding while the second exterior member 130 is included therein and includes the electrode assembly 110. 122 to 125).
  • one of the first to fourth terrace portions 122 to 125 for example, the first terrace portion 125 and the second exterior member 130 are previously coupled to the fourth terrace portion 125.
  • the second exterior member 130 is rotated about the fourth terrace part 125 so that the first exterior member 120 and the second exterior member 130 are aligned, and the first exterior member 130 is aligned.
  • the third to third terrace portions 122 to 124 may be sealed (three-sided sealing).
  • the first exterior member 120 and the second exterior member 130 accommodate the electrode assembly 110 in a completely separated state, and then the first to fourth terrace portions 122 to 125 are It is also possible to seal (four-sided sealing).
  • 125 is folded up in the direction indicated by the arrow with respect to each boundary 123a, 124a, 125a for the inner region.
  • the folding order is shown as a number 1 to 3, the order can be changed according to the selection of those skilled in the art.
  • the first overlapping portion 126, the third terrace portion 124, and the fourth terrace portion 126 formed between the second terrace portion 123 and the fourth terrace portion 125 may be used.
  • the second overlapping portion 127 formed between the terrace portions 125 may be formed.
  • the first and second overlapping portions 126 and 127 may be folded in an arrow direction to contact the fourth terrace portion 125, respectively.
  • the first and second overlapping portions 126 and 127 may be in contact with the second terrace portion 123 and the third terrace portion 124, respectively, according to a selection by those skilled in the art. It is also possible to fold.
  • the shape of the space 121 may be somewhat deformed.
  • the electrode assembly 110 since no pressure is applied to the electrode assembly 110 accommodated in the first exterior member 120, the electrode assembly 110 may be safely received.
  • a secondary battery 100 having a final structure in which the second to fourth terrace parts 123 to 125 are folded may be formed.
  • the second to fourth terrace parts 123 to 125 are all folded to minimize the volume of the secondary battery 100, while the electrode assembly 110 is a space part of the first packaging material 120. Since it is accommodated over an area except for 121, the energy density can be increased within a limited space.
  • FIG. 5 to 7 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to another exemplary embodiment of the present invention. Parts having the same structure and operation as those of the above-described embodiment are denoted by the same reference numerals, and the following description will be mainly given of differences from the above-described embodiment.
  • the first exterior member 220 is formed such that an inner space thereof corresponds along the electrode assembly 110. More specifically, the first exterior member 220 may include protrusions 226 and 227 protruding toward the electrode assembly 110 in a region corresponding to the recess 110a of the electrode assembly 110. Can be. The protrusions 226 and 227 may be provided in a shape corresponding to the recess 110a of the electrode assembly 110.
  • the protrusions 226 and 227 may be folded up based on a diagonal line indicated by a dotted line such that the outermost edges of the protrusions 226 and 227 contact the edges corresponding to the recesses 110a of the electrode assembly 110.
  • 1 and 2 which are the order in which the protrusions 226 and 227 are folded, may be changed.
  • the second to fourth terrace portions 223, 224, and 225 are folded up based on the boundaries 223a, 224a, and 225a with the inside, respectively.
  • the second to fourth terrace units 223, 224, and 225 may be changed to 3 to 5, which are the folding order.
  • the second to fourth terrace units 223, 224, and 225 are folded to form a secondary battery 200 in a final form.
  • the secondary battery 200 can further reduce the volume compared to the previous embodiment. .
  • FIGS. 8 and 9 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to still another exemplary embodiment of the present invention.
  • the first exterior member 320 may include recesses 326 and 327 having a shape corresponding to the recess 110a of the electrode assembly 110 at an edge of the edge.
  • the sealing since the second to fourth terrace portions 323, 324, and 325 are formed to have the same thickness as the whole of the electrode assembly 110, the sealing may not be a problem.
  • the second to fourth terrace portions 323, 324, and 325 may be folded as arrows based on boundaries 323a, 324a, and 325a with respect to the inside, respectively.
  • the folding order indicated by 1 to 3 can be changed.
  • the secondary battery 300 may also maximize the area of the electrode assembly 110 in a limited space.
  • 10 to 12 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to still another exemplary embodiment of the present invention.
  • the shape of the electrode assembly 410 and the first pouch 420 surrounding the electrode assembly 410 is illustrated.
  • the electrode assembly 410 has an amorphous planar shape rather than a conventional quadrangular shape. This electrode assembly 410 may be applied to a circular display, such as, for example, a smart watch. In FIG. 10, the electrode assembly 410 is illustrated in a hexagonal planar shape, but the shape of the electrode assembly 410 may be changed by a person skilled in the art.
  • the electrode assembly 410 as a hexagon includes a pair of lead tabs 114 and 115 protruding from one surface thereof, and insulating members 116 and 117 formed in an area where the lead tabs 114 and 115 contact the pouch 420. ) May be included.
  • the first exterior member 420 is formed to have an amorphous planar shape corresponding to the electrode assembly 410.
  • the first exterior member 420 may have a hexahedron shape.
  • the first exterior member 420 may include a first terrace portion 422 formed at a side at which the lead tabs 114 and 115 protrude, and second to sixth terrace portions formed at the remaining five sides along the hexagon shape. 423 to 427).
  • first exterior member 420 may include corner portions 420a to 420d respectively positioned between sides of the second terrace portion 422 to the sixth terrace portion 427.
  • first exterior member 420 may be folded in the direction of the arrow denoted by 1 to 4 in the corner portions 420a to 420d, respectively.
  • the folding process at the corners 420a to 420d may be performed along a line shown by a dotted line.
  • the lines may be formed at positions where the corner portions 420a to 420d are folded toward the inside of the first exterior member 420.
  • the second to sixth terrace parts 422 to 427 are then folded inward.
  • the second to sixth terrace parts 422 to 427 may be folded as arrows based on boundaries 323a, 324a, and 325a with respect to the inside of the second genital pouch, respectively.
  • the secondary battery 400 may maximize the area of the electrode assembly 410 within a limited space even in an amorphous shape.
  • the present invention relates to a pouch type secondary battery capable of increasing energy density and a method of manufacturing the same.
  • the secondary battery and a method of manufacturing the same according to the present invention can increase the energy density while maintaining the effect of the pouch sealing by accommodating an electrode assembly in which a recess is formed corresponding to the maximum area except for the area required to fold the terrace of the pouch.

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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)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Abstract

The present invention relates to a pouch-type secondary battery, capable of increasing energy density, and a production method therefor. The secondary battery according to the present invention comprises: an electrode assembly which has a positive electrode plate, a negative electrode plate, and a separator formed in a wound manner, comprises a depressed part, depressed inwards from at least one side thereof, and comprises a pair of lead tabs drawn from the positive electrode plate and negative electrode plate; and a pouch comprising terrace parts formed by sealing the electrode assembly, wherein the pouch may be formed with the terrace parts folded in areas, other than the area in which the lead tabs are drawn.

Description

이차 전지 및 그 제조 방법Secondary Battery and Manufacturing Method Thereof

본 발명은 에너지 밀도를 높일 수 있는 파우치형 이차 전지 및 그 제조 방법에 관한 것이다.The present invention relates to a pouch type secondary battery capable of increasing energy density and a method of manufacturing the same.

일반적으로 이차 전지는 충전이 불가능한 일차 전지와는 달리 충전 및 방전이 가능한 전지로서, 하나의 배터리 셀이 팩 형태로 포장된 저용량 전지의 경우 스마트폰, 태블릿 컴퓨터 및 디지털 카메라와 같은 휴대가 가능한 소형 전자기기에 사용되고, 배터리 셀이 수십 내지 수백 개 연결된 대용량 전지의 경우 전기 자전거, 전기 스쿠터, 하이브리드 자동차, 전기 자동차 등의 모터 구동용 전원으로 사용되고 있다.In general, a secondary battery is a battery that can be charged and discharged unlike a primary battery that cannot be charged. In the case of a low-capacity battery in which one battery cell is packaged in a pack form, a portable electronic device such as a smartphone, a tablet computer, and a digital camera In the case of a large-capacity battery in which tens or hundreds of battery cells are connected to a device, it is used as a power source for driving motors of electric bicycles, electric scooters, hybrid vehicles, and electric vehicles.

이차 전지는 여러 가지 형상으로 제조되고 있는데, 대표적인 형상으로는 각형, 원통형 및 파우치형 등을 들 수 있으며, 양극판 및 음극판 사이에 절연체인 분리막을 개재한 전극 조립체와, 전해액과, 상술한 전극 조립체 및 전해액을 수용하는 케이스로 이루어진다.Secondary batteries are manufactured in various shapes, and typical shapes include square, cylindrical, and pouch types, and include an electrode assembly, an electrolyte solution, an electrode assembly, and the above-described electrode assembly, which are interposed between an anode plate and a cathode plate. It consists of a case which accommodates electrolyte solution.

이 중에서, 파우치형 전지는 전극 조립체를 상하부의 파우치로 감싸서 밀봉하는 형태를 갖고, 밀봉을 위한 실링부를 접어서 부피를 줄이는 형태를 갖는다. 또한, 전자 제품이 점차 소형화되고 있기 때문에, 제한적인 공간에서 보다 높은 에너지 밀도를 갖는 형태의 이차 전지가 요구되고 있다.Among these, the pouch-type battery has a form in which the electrode assembly is wrapped with a pouch in the upper and lower parts and sealed, and the volume is reduced by folding a sealing part for sealing. In addition, as electronic products are gradually miniaturized, a secondary battery having a higher energy density in a limited space is required.

본 발명은 에너지 밀도를 높일 수 있는 파우치형 이차 전지 및 그 제조 방법을 제공한다.The present invention provides a pouch type secondary battery capable of increasing energy density and a method of manufacturing the same.

본 발명에 따른 이차 전지는 양극판, 음극판 및 세퍼레이터가 권취되어 형성되고, 적어도 일측으로부터 내부를 향해 함입된 함입부를 포함하며, 상기 양극판 및 음극판으로부터 인출된 한 쌍의 리드탭을 포함하는 전극 조립체; 및 상기 전극 조립체를 밀봉하여 형성된 테라스부를 포함하는 파우치를 포함하고, 상기 파우치는 상기 리드탭이 인출되는 영역 이외의 영역에서 상기 테라스부가 접혀서 형성될 수 있다.According to the present invention, a secondary battery includes: an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator formed therein, including an indentation recessed inward from at least one side, and including a pair of lead tabs drawn from the positive electrode plate and the negative electrode plate; And a pouch including a terrace formed by sealing the electrode assembly, wherein the pouch may be formed by folding the terrace in a region other than a region where the lead tab is drawn out.

여기서, 상기 전극 조립체의 함입부는 상기 리드탭이 인출된 영역 이외의 영역에 형성될 수 있다.Here, the recess of the electrode assembly may be formed in a region other than the region where the lead tab is drawn out.

그리고 상기 파우치는 상기 전극 조립체의 함입부에 대응되는 영역에서 상기 전극 조립체에 대해 공간을 제공하는 공간부를 더 포함하여 형성될 수 있다.The pouch may further include a space that provides a space with respect to the electrode assembly in a region corresponding to the recess of the electrode assembly.

또한, 상기 파우치는 접히는 상기 테라스부의 사이에서 중첩되어 형성되는 중첩부를 더 포함하고, 상기 중첩부는 상기 테라스부의 적어도 일면을 향해 접혀서 접촉될 수 있다.The pouch may further include an overlapping portion formed to overlap between the folding terrace portions, and the overlapping portion may be contacted by folding toward at least one surface of the terrace portion.

또한, 상기 파우치는 일측 모서리로부터 상기 전극 조립체의 함입부를 향해 내측으로 접히고, 상기 리드탭이 인출되는 나머지 영역의 테라스부가 접혀서 형성될 수 있다.In addition, the pouch may be formed by folding inward from the one side edge toward the depression of the electrode assembly, and the terrace portion of the remaining area from which the lead tab is drawn out.

또한, 상기 파우치의 일측 모서리는 상기 전극 조립체의 함입부에 대응되는 영역을 향해 상기 일측 모서리로부터 대각선 방향으로 접혀서 형성될 수 있다.In addition, one side edge of the pouch may be formed by folding in a diagonal direction from the one edge toward the area corresponding to the depression of the electrode assembly.

또한, 상기 테라스부는 인접한 한 쌍이 상기 일측 모서리의 중앙 영역에서 접하도록 형성되고, 내부를 향하는 경계를 기준으로 접히도록 형성될 수 있다.In addition, the terrace portion is formed so that the adjacent pair is in contact with the central area of the one corner, it may be formed to be folded based on the boundary facing inward.

또한, 상기 파우치는 상기 전극 조립체의 함입부에 대응되어 외부로부터 함입되도록 형성된 함입부를 더 포함할 수 있다.In addition, the pouch may further include a recess formed to correspond to the recess of the electrode assembly from the outside.

또한, 상기 테라스부는 상기 함입부를 기준으로 각 영역이 구분되고, 각각의 상기 테라스부는 내부 영역에 대한 경계를 기준으로 접혀서 형성될 수 있다.In addition, the terrace portion may be divided into regions based on the depression, and each of the terrace portions may be formed by being folded based on a boundary of the inner region.

또한, 상기 파우치는 상기 전극 조립체를 포함하는 전체 둘레를 따라 균일한 폭을 갖도록 형성될 수 있다.In addition, the pouch may be formed to have a uniform width along the entire circumference including the electrode assembly.

또한, 상기 파우치는 일측 모서리로부터 비정형인 상기 전극 조립체의 모서리를 향해 내측으로 접히고, 상기 리드탭이 인출되는 나머지 영역의 테라스부가 접혀서 형성될 수 있다.In addition, the pouch may be formed by folding inward from the one side edge toward the corner of the at least one electrode assembly, and the terrace portion of the remaining area from which the lead tab is drawn out.

또한, 상기 파우치의 일측 모서리는 상기 전극 조립체를 따라 비정형으로 형성된 상기 파우치에서 적어도 하나의 인접한 변들의 사이에 대응되도록 형성되고, 상기 파우치의 내측을 향하도록 대각선 방향으로 접혀서 형성될 수 있다.In addition, one side edge of the pouch may be formed to correspond to at least one adjacent side of the pouch formed irregularly along the electrode assembly, it may be formed by folding in a diagonal direction toward the inside of the pouch.

본 발명에 따른 이차 전지 및 그 제조 방법은 파우치의 테라스부를 접을 때 필요한 영역을 제외한 최대한의 영역에 대응되는 함입부가 형성된 전극 조립체를 수용함으로써, 파우치 실링의 효과는 유지하면서도 에너지 밀도를 높일 수 있다.The secondary battery and a method of manufacturing the same according to the present invention can increase the energy density while maintaining the effect of the pouch sealing by accommodating an electrode assembly in which a recess is formed corresponding to the maximum area except for the area required to fold the terrace of the pouch.

도 1은 본 발명의 일 실시예에 따른 이차 전지의 분해 사시도이다.1 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.

도 2 내지 도 4는 본 발명의 일 실시예에 따른 이차 전지에서 파우치의 테라스부를 접는 공정을 도시한 평면도이다.2 to 4 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to an exemplary embodiment of the present invention.

도 5 내지 도 7은 본 발명의 다른 실시예에 따른 이차 전지에서 파우치의 테라스부를 접는 공정을 도시한 평면도이다.5 to 7 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to another exemplary embodiment of the present invention.

도 8 및 도 9는 본 발명의 또 다른 실시예에 따른 이차 전지에서 파우치의 테라스부를 접는 공정을 도시한 평면도이다.8 and 9 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to still another exemplary embodiment of the present invention.

도 10 내지 도 12는 본 발명의 또 다른 실시예에 따른 이차 전지에서 파우치의 테라스부를 접는 공정을 도시한 평면도이다.10 to 12 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to still another exemplary embodiment of the present invention.

[부호의 설명][Description of the code]

100, 200, 300, 400; 이차 전지 110, 410; 전극 조립체100, 200, 300, 400; Secondary batteries 110 and 410; Electrode assembly

110a; 함입부 120, 220, 320, 420; 제 1 외장재110a; Depressions 120, 220, 320, 420; 1st exterior material

130; 제 2 외장재 121, 421; 공간부130; Second exterior members 121 and 421; Space

122, 222, 322, 422; 제 1 테라스부 123, 223, 323, 423; 제 2 테라스부122, 222, 322, 422; First terrace portions 123, 223, 323, and 423; 2nd terrace part

124, 224, 324, 424; 제 3 테라스부 125, 225, 325, 425; 제 4 테라스부124, 224, 324, 424; Third terrace portion 125, 225, 325, 425; Fourth terrace part

426; 제 5 테라스부 426; 제 6 테라스부426; Fifth terrace portion 426; The sixth terrace department

126, 127; 중첩부 226, 227; 돌출부126, 127; Overlap 226, 227; projection part

326, 327; 함입부326, 327; Depression

본 발명이 속하는 기술분야에 있어서 통상의 지식을 가진 자가 용이하게 실시할 수 있을 정도로 본 발명의 바람직한 실시예를 도면을 참조하여 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily practice the present invention.

도 1은 본 발명의 일 실시예에 따른 이차 전지의 분해 사시도이다.1 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.

도 1을 참조하면, 본 발명의 일 실시예에 따른 이차 전지(100)는 전극 조립체(110) 및 상기 전극 조립체를 수용하는 파우치(120, 130)를 포함할 수 있다.Referring to FIG. 1, the secondary battery 100 according to an embodiment of the present invention may include an electrode assembly 110 and pouches 120 and 130 accommodating the electrode assembly.

상기 전극 조립체(110)는 제 1 극판(111) 및 제 2 극판(112)이 세퍼레이터(113)를 사이에 두고 권취된 젤리롤 형태이거나 또는 일 방향으로 적층된 형태로 구성될 수 있다. 상기 제 1 극판(111)은 양극판, 상기 제 2 극판(112)은 음극판으로 구성될 수 있으며, 필요에 따라서는 상기 극판(111, 112)의 극성이 바뀌는 것도 가능하다. 이하에서는 설명의 편의상 상기 제 1 극판(111)이 양극, 상기 제 2 극판(112)이 음극인 것을 예로써 설명하도록 한다.The electrode assembly 110 may be configured in the form of a jelly roll in which the first electrode plate 111 and the second electrode plate 112 are wound with the separator 113 interposed therebetween, or stacked in one direction. The first electrode plate 111 may be formed of a positive electrode plate, and the second electrode plate 112 may be formed of a negative electrode plate. If necessary, the polarities of the electrode plates 111 and 112 may be changed. Hereinafter, for convenience of description, the first electrode plate 111 is an anode, and the second electrode plate 112 will be described as an example.

상기 제 1 극판(111)은 알루미늄과 같은 금속 포일로 형성된 제 1 전극 집전체에 전이금속산화물 등의 제 1 전극 활물질을 도포함으로써 형성되며, 제 1 활물질이 도포되지 않은 영역인 무지부를 포함한다. 상기 무지부는 제 1 전극판과 외부 간의 전류 흐름의 통로를 제공한다. 한편, 상기 제 1 전극판의 재질로서 본 발명의 범위를 한정하는 것은 아니다.The first electrode plate 111 is formed by applying a first electrode active material such as a transition metal oxide to a first electrode current collector formed of a metal foil such as aluminum, and includes a non-coated portion that is a region where the first active material is not coated. The uncoated portion provides a passage of current flow between the first electrode plate and the outside. In addition, the range of this invention is not limited as a material of a said 1st electrode plate.

또한, 상기 제 1 전극판의 무지부에는 제 1 리드 탭(114)을 형성될 수 있다. 상기 제 1 리드 탭(114)은 상기 제 1 극판(111)의 전기적 신호를 입출력하는 경로를 형성하게 된다.In addition, a first lead tab 114 may be formed on the uncoated portion of the first electrode plate. The first lead tab 114 forms a path for inputting and outputting an electrical signal of the first electrode plate 111.

상기 제 2 극판(112)은 구리 또는 니켈과 같은 금속 포일로 형성된 제 2 전극 집전체에 흑연 또는 탄소 등의 제 2 전극 활물질을 도포함으로써 형성되며, 제 2 활물질이 도포되지 않는 영역인 무지부를 포함한다.The second electrode plate 112 is formed by applying a second electrode active material such as graphite or carbon to a second electrode current collector formed of a metal foil such as copper or nickel, and includes an uncoated portion that is a region where the second active material is not coated. do.

또한, 상기 제 2 극판(112)의 무지부에는 제 2 리드 탭(115)이 형성되어 제 2 극판(112)의 전기적 신호를 입출력하는 경로를 형성하게 된다.In addition, a second lead tab 115 is formed on the uncoated portion of the second electrode plate 112 to form a path for inputting and outputting an electrical signal of the second electrode plate 112.

상기 세퍼레이터(113)는 제 1 전극판과 제 2 전극판의 사이에 위치되어 쇼트를 방지하고 리튬 이온의 이동을 가능하게 하는 역할을 수행한다. 상기 세퍼레이터는 폴리에틸렌이나, 폴리 프로필렌이나, 폴리 에틸렌과 폴리 프로필렌의 복합 필름으로 이루어질 수 있다. 한편, 상기 세퍼레이터의 재질로서 본 발명의 범위를 한정하는 것은 아니다.The separator 113 is positioned between the first electrode plate and the second electrode plate to prevent a short and to allow movement of lithium ions. The separator may be made of polyethylene, polypropylene, or a composite film of polyethylene and polypropylene. In addition, the range of this invention is not limited as a material of the said separator.

상기와 같은 전극 조립체(120)는 전해액과 함께 상기 파우치(120)에 수납된다. 상기 전해액은 EC(ethylene carbonate), PC(propylene carbonate), DEC(diethyl carbonate), EMC(ethyl methyl carbonate), DMC(dimethyl carbonate)와 같은 유기 용매에 LiPF6, LiBF4와 같은 리튬염으로 이루어질 수 있다.The electrode assembly 120 as described above is accommodated in the pouch 120 together with the electrolyte. The electrolyte may be made of lithium salts such as LiPF 6 and LiBF 4 in organic solvents such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC). have.

또한, 상기 제 1 리드탭(114)과 제 2 리드탭(115)이 상기 파우치(120)와 결합되는 영역인 제 1 측에는 각각 절연부재(116, 117)가 결합될 수 있다. 상기 절연부재(116, 117)는 상기 리드탭(114, 115)로부터 상기 파우치(120)를 전기적으로 절연시킬 수 있다.In addition, insulating members 116 and 117 may be coupled to the first side, which is an area where the first lead tab 114 and the second lead tab 115 are coupled to the pouch 120. The insulating members 116 and 117 may electrically insulate the pouch 120 from the lead tabs 114 and 115.

여기서, 상기 전극 조립체(110)는 상기 리드탭(114, 115)이 형성된 반대측인 제 2 측에 일부 영역이 내부로 인입되어 형성된 함입부(110a)를 포함할 수 있다. 상기 함입부(110a)는 상기 전극 조립체(110)의 제 2 측으로부터 일부 영역이 제거된 형태로 형성될 수 있다. 또한, 상기 함입부(110a)는 상기 전극 조립체(110)가 상기 파우치(120)에 삽입되는 양 모서리의 영역에 형성될 수 있다. 상기 함입부(110a)는 후술할 바와 같이, 상기 파우치(120)의 테라스부가 접히게 되는 영역 중 중첩되는 영역에 대응될 수 있다. 따라서, 상기 전극 조립체(110)는 상기 파우치(120)의 중첩되는 영역에 대응된 상기 함입부(110a)를 제외한 나머지 영역에서 상기 파우치(120)의 내부를 채우도록 형성될 수 있기 때문에, 파우치형의 이차 전지(100)에서 에너지 밀도를 증대시킬 수 있다.Here, the electrode assembly 110 may include a recess 110a formed by inserting a portion of the region into the second side opposite to the side where the lead tabs 114 and 115 are formed. The depression 110a may be formed in a form in which some regions are removed from the second side of the electrode assembly 110. In addition, the recess 110a may be formed at regions of both corners at which the electrode assembly 110 is inserted into the pouch 120. As described later, the recess 110a may correspond to an overlapping area among areas where the terrace part of the pouch 120 is folded. Therefore, since the electrode assembly 110 may be formed to fill the inside of the pouch 120 in the remaining area except for the recess 110a corresponding to the overlapping area of the pouch 120, the pouch type Energy density of the secondary battery 100 can be increased.

상기 파우치(120, 130)는 상기 전극 조립체(110)를 감싸는 다층의 시트 구조로 형성될 수 있다. 상기 파우치(120, 130)는 내면을 형성하며 절연 및 열융착 작용하는 폴리머 시트(10), 외면을 형성하여 보호 작용하는 PET(polyethyleneterephthalate) 시트, 나일론 시트 또는 PET-나일론 복합 시트(11)(이하에서, 편의상 "나일론 시트"를 예로 설명한다), 및 기계적인 강도를 제공하는 금속 시트(12)를 포함한다. 상기 금속 시트(12)는 폴리머 시트(10)와 나일론 시트(11)의 사이에 개재되며, 일례로 알루미늄 시트로 형성될 수 있다.The pouches 120 and 130 may be formed in a multilayered sheet structure surrounding the electrode assembly 110. The pouches 120 and 130 form an inner surface and have a polymer sheet 10 that insulates and heat-seals, a polyethylene terephthalate (PET) sheet, a nylon sheet, or a PET-nylon composite sheet 11 (hereinafter, formed by protecting the outer surface). For the sake of convenience, " nylon sheet " will be described as an example), and a metal sheet 12 that provides mechanical strength. The metal sheet 12 is interposed between the polymer sheet 10 and the nylon sheet 11, and may be formed of, for example, an aluminum sheet.

또한, 상기 파우치(120, 130)는 상기 전극 조립체(110)를 수용하는 제 1 외장재(120), 상기 전극 조립체(110)를 덮고 상기 전극 조립체(110)의 외측에서 상기 제 1 외장재(120)에 열융착되는 제 2 외장재(130)를 포함한다.In addition, the pouches 120 and 130 may cover the first exterior member 120 accommodating the electrode assembly 110, the electrode assembly 110, and the first exterior member 120 outside the electrode assembly 110. It includes a second packaging material 130 which is heat-sealed to.

상기 제 1 외장재(120) 및 제 2 외장재(130)는 각각 상술한 동일 구조의 폴리머 시트(120a), 나일론 시트(120b) 및 금속 시트(120c)로 형성될 수 있다. The first exterior member 120 and the second exterior member 130 may be formed of the polymer sheet 120a, the nylon sheet 120b, and the metal sheet 120c having the same structure, respectively.

예를 들면, 상기 제 1 외장재(120)는 상기 전극 조립체(110)를 수용하도록 오목한 구조로 형성되고, 상기 제 2 외장재(130)는 상기 제 1 외장재(120)에 수용된 전극 조립체(110)를 덮을 수 있도록 평평하게 형성될 수 있다.For example, the first exterior member 120 is formed in a concave structure to accommodate the electrode assembly 110, and the second exterior member 130 is configured to accommodate the electrode assembly 110 accommodated in the first exterior member 120. It may be formed flat so as to cover it.

또한, 상기 제 1 외장재(120) 및 제 2 외장재(130)는 상기 전극 조립체(110)를 수용한 상태에서 실링되고, 이에 따라 형성된 테라스부가 접혀서 최종적인 구조를 형성할 수 있다.In addition, the first exterior member 120 and the second exterior member 130 may be sealed in a state in which the electrode assembly 110 is accommodated, and the terrace portion formed according to this may be folded to form a final structure.

이하에서는 본 발명의 일 실시예에 다른 이차 전지에서 파우치의 테라스부를 접는 공정을 순차적으로 설명하도록 한다.Hereinafter, the process of folding the terrace portion of the pouch in the secondary battery according to an embodiment of the present invention will be described sequentially.

도 2 내지 도 4는 본 발명의 일 실시예에 따른 이차 전지에서 파우치의 테라스부를 접는 공정을 도시한 평면도이다. 여기서, 상기 도 2 내지 도 4는 파우치의 실링 이후 제 1 외장재(120)가 상부에 위치하고, 상기 제 2 외장재(130)가 하부에 위치하도록 뒤집은 상태에서의 평면도를 도시한 것이다. 또한, 편의상 상기 제 1 외장재(120)를 기준으로 도시 및 설명될 것이나, 상기 제 2 외장재(130)의 대응되는 영역도 공정 중 함께 접히는 것으로 의도된다. 2 to 4 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to an exemplary embodiment of the present invention. 2 to 4 illustrate a plan view in a state in which the first exterior member 120 is positioned at the top and the second exterior member 130 is located at the bottom after the sealing of the pouch. In addition, although illustrated and described with reference to the first sheath 120 for convenience, the corresponding region of the second sheath 130 is also intended to be folded together during the process.

도 2 내지 도 4를 참조하면, 상기 제 1 외장재(120)는 상기 전극 조립체(110)의 함입부(110a)에 대응되는 영역에서, 내부로 함입되지 않고 형상을 유지하여 상기 제 1 외장재(120)의 형상이 대략 직사각형의 형상을 갖도록 하는 공간부(121)를 포함한다. 상기 공간부(121)는 후술할 바와 같이, 상기 제 1 외장재(120)의 실링 영역을 접는 공정에서 상기 전극 조립체(110)를 향해 일정 부분 포함될 수 있도록 하여, 상기 전극 조립체(110)가 변형되는 것을 방지할 수 있다. 물론, 상기 제 2 외장재(130)도 실링을 위해 상기 제 1 외장재(120)와 대응되는 둘레 형상을 갖도록 형성되기 때문에 역시 상기 공간부(121)에 대응되는 영역이 존재함은 물론이다.2 to 4, in the region corresponding to the recess 110a of the electrode assembly 110, the first exterior member 120 maintains its shape without being embedded in the first exterior member 120. ) Includes a space 121 to have a substantially rectangular shape. As described later, the space 121 may be partially included toward the electrode assembly 110 in a folding process of the sealing region of the first exterior member 120, such that the electrode assembly 110 is deformed. Can be prevented. Of course, since the second exterior member 130 is also formed to have a circumferential shape corresponding to the first exterior member 120 for sealing, there is, of course, a region corresponding to the space 121.

상기 제 1 외장재(120)는 및 제 2 외장재(130)가 내부에 상기 전극 조립체(110)를 포함한 상태로 융착을 통해 실링된 이후, 실링된 가장자리를 따라 형성되는 제 1 내지 제 4 테라스부(122 내지 125)를 포함할 수 있다. 여기서, 상기 제 1 내지 제 4 테라스부(122 내지 125) 중 하나, 예를 들어 상기 제 4 테라스부(125)는 상기 제 1 외장재(120) 및 제 2 외장재(130)가 미리 결합되어, 상기 전극 조립체(110)의 수용 이후 상기 제 4 테라스부(125)를 중심으로 상기 제 2 외장재(130)가 회전하여 상기 제 1 외장재(120) 및 제 2 외장재(130)가 정렬되고, 상기 제 1 내지 제 3 테라스부(122 내지 124)가 실링(3면 실링)될 수 있다. 다만, 당업자의 선택에 따라 제 1 외장재(120) 및 제 2 외장재(130)는 완전히 분리된 상태에서 전극 조립체(110)를 수용하고, 이후 상기 제 1 내지 제 4 테라스부(122 내지 125)가 실링(4면 실링)되는 것도 가능하다.The first to fourth terrace parts 120 are formed along the edges of the first and second terrace members 130 that are formed through the welding while the second exterior member 130 is included therein and includes the electrode assembly 110. 122 to 125). Here, one of the first to fourth terrace portions 122 to 125, for example, the first terrace portion 125 and the second exterior member 130 are previously coupled to the fourth terrace portion 125. After accommodating the electrode assembly 110, the second exterior member 130 is rotated about the fourth terrace part 125 so that the first exterior member 120 and the second exterior member 130 are aligned, and the first exterior member 130 is aligned. The third to third terrace portions 122 to 124 may be sealed (three-sided sealing). However, according to the choice of the person skilled in the art, the first exterior member 120 and the second exterior member 130 accommodate the electrode assembly 110 in a completely separated state, and then the first to fourth terrace portions 122 to 125 are It is also possible to seal (four-sided sealing).

또한, 도 2를 참조하면, 실링 이후, 상기 제 1 내지 제 4 테라스부(122 내지 124) 중에서 상기 리드탭(114, 115)가 돌출되는 제 1 테라스부(122)를 제외한 나머지(123, 124 125)가 내부 영역에 대한 각각의 경계(123a, 124a, 125a)를 기준으로 화살표로 표시된 방향으로 접혀 올라가게 된다. 이 때, 접히는 순서가 숫자 ① 내지 ③으로 도시되어 있으나, 당업자의 선택에 따라 상기 순서는 바뀔 수 있다.In addition, referring to FIG. 2, after sealing, the remaining portions 123 and 124 of the first to fourth terrace portions 122 to 124 except for the first terrace portion 122 from which the lead tabs 114 and 115 protrude. 125 is folded up in the direction indicated by the arrow with respect to each boundary 123a, 124a, 125a for the inner region. At this time, the folding order is shown as a number ① to ③, the order can be changed according to the selection of those skilled in the art.

또한, 도 3을 참조하면, 이에 따라, 상기 제 2 테라스부(123)와 제 4 테라스부(125)의 사이에 형성된 제 1 중첩부(126), 상기 제 3 테라스부(124)와 제 4 테라스부(125)의 사이에 형성된 제 2 중첩부(127)이 형성될 수 있다. 또한 상기 제 1 및 제 2 중첩부(126, 127)은 상기 제 4 테라스부(125)를 접하도록 각각 화살표 방향으로 접힐 수 있다. 물론, 여기서 ④ 및 ⑤로 도시된 순서 역시 변경되는 것이 가능하다. 또한, 별도로 도시하지는 않았지만, 당업자의 선택에 따라 상기 제 1 및 제 2 중첩부(126, 127)은 각각 제 2 테라스부(123) 및 제 3 테라스부(124)에 각각 접하도록 화살표의 반대 방향으로 접히는 것도 가능하다.In addition, referring to FIG. 3, accordingly, the first overlapping portion 126, the third terrace portion 124, and the fourth terrace portion 126 formed between the second terrace portion 123 and the fourth terrace portion 125 may be used. The second overlapping portion 127 formed between the terrace portions 125 may be formed. In addition, the first and second overlapping portions 126 and 127 may be folded in an arrow direction to contact the fourth terrace portion 125, respectively. Of course, it is also possible to change the order shown by (4) and (5) here. In addition, although not separately illustrated, the first and second overlapping portions 126 and 127 may be in contact with the second terrace portion 123 and the third terrace portion 124, respectively, according to a selection by those skilled in the art. It is also possible to fold.

이 때, 상기 제 1 및 제 2 중첩부(126, 127)을 접는 과정에서, 상기 공간부(121)의 형상이 다소 변형될 수 있다. 또한, 변형의 경우에도 상기 제 1 외장재(120)의 내부에 수용된 전극 조립체(110)에는 압력이 가해지지 않기 때문에, 상기 전극 조립체(110)가 안전하게 수용될 수 있다.At this time, in the process of folding the first and second overlapping portions 126 and 127, the shape of the space 121 may be somewhat deformed. In addition, even in the case of deformation, since no pressure is applied to the electrode assembly 110 accommodated in the first exterior member 120, the electrode assembly 110 may be safely received.

도 4를 참조하면, 상기 제 2 내지 제 4 테라스부(123 내지 125)가 접힌 최종적인 구조의 이차 전지(100)가 형성될 수 있다. 상기 구조에 따르면, 상기 제 2 내지 제 4 테라스부(123 내지 125)가 모두 접혀서 이차 전지(100)의 부피를 최소화하는 반면, 상기 전극 조립체(110)는 상기 제 1 외장재(120)의 공간부(121)를 제외한 영역에 걸쳐 수용되어 있기 때문에 에너지 밀도를 제한된 공간 내에서 높일 수 있게 된다.Referring to FIG. 4, a secondary battery 100 having a final structure in which the second to fourth terrace parts 123 to 125 are folded may be formed. According to the above structure, the second to fourth terrace parts 123 to 125 are all folded to minimize the volume of the secondary battery 100, while the electrode assembly 110 is a space part of the first packaging material 120. Since it is accommodated over an area except for 121, the energy density can be increased within a limited space.

이하에서는 본 발명의 다른 실시예에 따른 이차 전지의 구조 및 제조 공정을 설명하도록 한다.Hereinafter will be described the structure and manufacturing process of a secondary battery according to another embodiment of the present invention.

도 5 내지 도 7은 본 발명의 다른 실시예에 따른 이차 전지에서 파우치의 테라스부를 접는 공정을 도시한 평면도이다. 앞서 설명한 실시예와 동일한 구조 및 동작을 갖는 부분에 대해서는 동일한 도면부호를 붙였으며, 이하에서는 앞선 실시예와의 차이점을 위주로 설명하도록 한다.5 to 7 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to another exemplary embodiment of the present invention. Parts having the same structure and operation as those of the above-described embodiment are denoted by the same reference numerals, and the following description will be mainly given of differences from the above-described embodiment.

먼저, 도 5를 참조하면, 상기 제 1 외장재(220)는 내부 공간이 상기 전극 조립체(110)를 따라 대응되도록 형성되어 있다. 보다 구체적으로, 상기 제 1 외장재(220)는 상기 전극 조립체(110)의 함입부(110a)에 대응되는 영역에서 상기 전극 조립체(110)를 향하도록 돌출되어 형성된 돌출부(226, 227)를 포함할 수 있다. 상기 돌출부(226, 227)는 상기 전극 조립체(110)의 함입부(110a)에 대응되는 형상으로 구비될 수 있다.First, referring to FIG. 5, the first exterior member 220 is formed such that an inner space thereof corresponds along the electrode assembly 110. More specifically, the first exterior member 220 may include protrusions 226 and 227 protruding toward the electrode assembly 110 in a region corresponding to the recess 110a of the electrode assembly 110. Can be. The protrusions 226 and 227 may be provided in a shape corresponding to the recess 110a of the electrode assembly 110.

또한, 상기 돌출부(226, 227)는 최외곽의 모서리가 상기 전극 조립체(110)의 함입부(110a)에 대응된 모서리에 맞닿도록 점선으로 표시된 대각선을 기준으로 접혀 올라가게 된다. 물론, 상기 돌출부(226, 227)이 접히는 순서인 ① 및 ②는 변경되어도 무방하다.In addition, the protrusions 226 and 227 may be folded up based on a diagonal line indicated by a dotted line such that the outermost edges of the protrusions 226 and 227 contact the edges corresponding to the recesses 110a of the electrode assembly 110. Of course, ① and ②, which are the order in which the protrusions 226 and 227 are folded, may be changed.

도 6을 참조하면, 제 2 내지 제 4 테라스부(223, 224, 225)가 각각 내부와의 경계(223a, 224a, 225a)를 기준으로 접혀 올라가게 된다. 물론, 여기서도 상기 제 2 내지 제 4 테라스부(223, 224, 225)가 접히는 순서인 ③ 내지 ⑤는 변경될 수 있다.Referring to FIG. 6, the second to fourth terrace portions 223, 224, and 225 are folded up based on the boundaries 223a, 224a, and 225a with the inside, respectively. Of course, the second to fourth terrace units 223, 224, and 225 may be changed to 3 to 5, which are the folding order.

도 7을 참조하면, 상기 제 2 내지 제 4 테라스부(223, 224, 225)가 접힌 상태의 최종적 형태의 이차 전지(200)가 되시되어 있다. 이 경우, 상기 제 2 내지 제 4 테라스부(223, 224, 225)의 외부에 더 접하게 되는 구성이 존재하지 않기 때문에, 상기 이차 전지(200)는 앞선 실시예에 비해 부피를 더 줄일 수 있게 된다.Referring to FIG. 7, the second to fourth terrace units 223, 224, and 225 are folded to form a secondary battery 200 in a final form. In this case, since there is no configuration in contact with the outside of the second to fourth terrace portions 223, 224, and 225, the secondary battery 200 can further reduce the volume compared to the previous embodiment. .

이하에서는 본 발명의 또 다른 실시예에 따른 이차 전지의 구조 및 제조 공정을 설명하도록 한다.Hereinafter, a structure and a manufacturing process of a secondary battery according to another embodiment of the present invention will be described.

도 8 및 도 9는 본 발명의 또 다른 실시예에 따른 이차 전지에서 파우치의 테라스부를 접는 공정을 도시한 평면도이다.8 and 9 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to still another exemplary embodiment of the present invention.

도 8을 참조하면, 먼저, 제 1 외장재(320)는 가장자리의 모서리에 상기 전극 조립체(110)의 함입부(110a)와 대응되는 형상의 함입부(326, 327)를 포함할 수 있다. 또한, 이 경우에도 상기 제 2 내지 제 4 테라스부(323, 324, 325)는 상기 전극 조립체(110)의 형상을 따라 전체적으로 동일한 두께로 형성되어 있기 때문에 실링에는 문제가 되지 않을 수 있다.Referring to FIG. 8, first, the first exterior member 320 may include recesses 326 and 327 having a shape corresponding to the recess 110a of the electrode assembly 110 at an edge of the edge. In this case, since the second to fourth terrace portions 323, 324, and 325 are formed to have the same thickness as the whole of the electrode assembly 110, the sealing may not be a problem.

또한, 도시된 것과 같이, 상기 제 2 내지 제 4 테라스부(323, 324, 325)는 각각 내부에 대한 경계(323a, 324a, 325a)를 기준으로 화살표와 같이 접혀질 수 있다. 물론, ① 내지 ③으로 표시된 접는 순서는 변경이 가능하다.In addition, as illustrated, the second to fourth terrace portions 323, 324, and 325 may be folded as arrows based on boundaries 323a, 324a, and 325a with respect to the inside, respectively. Of course, the folding order indicated by ① to ③ can be changed.

도 9를 참조하면, 이에 따라 형성된 최종적인 이차 전지(300)가 도시되어 있다. 이러한 이차 전지(300)는 역시 제한된 공간 내에서 전극 조립체(110)의 면적을 극대화할 수 있게 된다.9, the final secondary battery 300 thus formed is shown. The secondary battery 300 may also maximize the area of the electrode assembly 110 in a limited space.

이하에서는 본 발명의 또 다른 실시예에 따른 이차 전지의 구조 및 제조 공정을 설명하도록 한다.Hereinafter, a structure and a manufacturing process of a secondary battery according to another embodiment of the present invention will be described.

도 10 내지 도 12는 본 발명의 또 다른 실시예에 따른 이차 전지에서 파우치의 테라스부를 접는 공정을 도시한 평면도이다.10 to 12 are plan views illustrating a process of folding a terrace portion of a pouch in a rechargeable battery according to still another exemplary embodiment of the present invention.

먼저, 도 10을 참조하면, 전극 조립체(410)와 이를 감싸는 제 1 파우치(420)의 형상이 도시되어 있다.First, referring to FIG. 10, the shape of the electrode assembly 410 and the first pouch 420 surrounding the electrode assembly 410 is illustrated.

상기 전극 조립체(410)는 통상적인 사각형이 아닌 비정형의 평면 형상을 갖는다. 이러한 전극 조립체(410)는 예를 들어, 스마트워치와 같은 원형 디스플레이에 적용될 수 있다. 도 10에서는 상기 전극 조립체(410)가 육각형의 평면 형상으로 도시되어 있으나, 상기 전극 조립체(410)의 형상은 당업자의 선택에 따라 달라지는 것이 가능하다. 육각형으로서의 상기 전극 조립체(410)는 일면으로부터 돌출된 한 쌍의 리드 탭(114, 115)를 포함하고, 리드탭(114, 115)이 파우치(420)와 접하는 영역에 형성된 절연부재(116, 117)를 포함할 수 있다.The electrode assembly 410 has an amorphous planar shape rather than a conventional quadrangular shape. This electrode assembly 410 may be applied to a circular display, such as, for example, a smart watch. In FIG. 10, the electrode assembly 410 is illustrated in a hexagonal planar shape, but the shape of the electrode assembly 410 may be changed by a person skilled in the art. The electrode assembly 410 as a hexagon includes a pair of lead tabs 114 and 115 protruding from one surface thereof, and insulating members 116 and 117 formed in an area where the lead tabs 114 and 115 contact the pouch 420. ) May be included.

제 1 외장재(420)는 상기 전극 조립체(410)와 대응되는 비정형의 평면 형상을 갖도록 형성된다. 이러한 제 1 외장재(420)는 육면체의 형상을 가질 수 있다. 상기 제 1 외장재(420)는 상기 리드 탭(114, 115)이 돌출되는 변에 형성된 제 1 테라스부(422), 상기 육각형의 형상을 따라 나머지 다섯 변에 각각 형성된 제 2 내지 제 6 테라스부(423 내지 427)를 포함할 수 있다.The first exterior member 420 is formed to have an amorphous planar shape corresponding to the electrode assembly 410. The first exterior member 420 may have a hexahedron shape. The first exterior member 420 may include a first terrace portion 422 formed at a side at which the lead tabs 114 and 115 protrude, and second to sixth terrace portions formed at the remaining five sides along the hexagon shape. 423 to 427).

또한, 상기 제 1 외장재(420)는 상기 제 2 테라스부(422)로부터 제 6 테라스부(427)에 이르는 각 변들의 사이에 각각 위치한 모서리부(420a 내지 420d)를 포함할 수 있다.In addition, the first exterior member 420 may include corner portions 420a to 420d respectively positioned between sides of the second terrace portion 422 to the sixth terrace portion 427.

또한, 상기 제 1 외장재(420)는 상기 모서리부(420a 내지 420d)에서 각각 ① 내지 ④로 표시된 화살표 방향으로 접힐 수 있다. 상기 모서리부(420a 내지 420d)에서 접히는 공정은 점선으로 도시된 라인을 따라 이루어질 수 있다. 상기 라인들은 상기 모서리부(420a 내지 420d)가 상기 제 1 외장재(420)의 내측을 향하여 접히도록 하는 위치에 형성될 수 있다.In addition, the first exterior member 420 may be folded in the direction of the arrow denoted by ① to ④ in the corner portions 420a to 420d, respectively. The folding process at the corners 420a to 420d may be performed along a line shown by a dotted line. The lines may be formed at positions where the corner portions 420a to 420d are folded toward the inside of the first exterior member 420.

도 11을 참조하면, 그 이후 상기 제 2 내지 제 6 테라스부(422 내지 427)가 내측을 향해 접히게 된다. 상기 제 2 내지 제 6 테라스부(422 내지 427)는 각각 성기 제 2 파우치 내부에 대한 경계(323a, 324a, 325a)를 기준으로 화살표와 같이 접혀질 수 있다. Referring to FIG. 11, the second to sixth terrace parts 422 to 427 are then folded inward. The second to sixth terrace parts 422 to 427 may be folded as arrows based on boundaries 323a, 324a, and 325a with respect to the inside of the second genital pouch, respectively.

도 12를 참조하면, 이에 따라 형성된 최종적인 이차 전지(400)가 도시되어 있다. 이러한 이차 전지(400)는 비정형의 형상에서도 제한된 공간 내에서 전극 조립체(410)의 면적을 극대화할 수 있게 된다.Referring to FIG. 12, the final secondary battery 400 thus formed is illustrated. The secondary battery 400 may maximize the area of the electrode assembly 410 within a limited space even in an amorphous shape.

이상에서 설명한 것은 본 발명에 의한 이차 전지 및 그 제조 방법을 실시하기 위한 하나의 실시예에 불과한 것으로서, 본 발명은 상기 실시예에 한정되지 않고, 이하의 특허청구범위에서 청구하는 바와 같이 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변경 실시가 가능한 범위까지 본 발명의 기술적 정신이 있다고 할 것이다.What has been described above is just one embodiment for carrying out the secondary battery and the manufacturing method according to the present invention, the present invention is not limited to the above embodiment, as claimed in the following claims of the present invention Without departing from the gist of the present invention, one of ordinary skill in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

본 발명은 에너지 밀도를 높일 수 있는 파우치형 이차 전지 및 그 제조 방법에 관한 것이다.The present invention relates to a pouch type secondary battery capable of increasing energy density and a method of manufacturing the same.

본 발명에 따른 이차 전지 및 그 제조 방법은 파우치의 테라스부를 접을 때 필요한 영역을 제외한 최대한의 영역에 대응되는 함입부가 형성된 전극 조립체를 수용함으로써, 파우치 실링의 효과는 유지하면서도 에너지 밀도를 높일 수 있다.The secondary battery and a method of manufacturing the same according to the present invention can increase the energy density while maintaining the effect of the pouch sealing by accommodating an electrode assembly in which a recess is formed corresponding to the maximum area except for the area required to fold the terrace of the pouch.

Claims (12)

양극판, 음극판 및 세퍼레이터가 권취되어 형성되고, 적어도 일측으로부터 내부를 향해 함입된 함입부를 포함하며, 상기 양극판 및 음극판으로부터 인출된 한 쌍의 리드탭을 포함하는 전극 조립체; 및An electrode assembly formed by winding a positive electrode plate, a negative electrode plate, and a separator, including an indentation recessed inward from at least one side, and including a pair of lead tabs drawn from the positive electrode plate and the negative electrode plate; And 상기 전극 조립체를 밀봉하여 형성된 테라스부를 포함하는 파우치를 포함하고,A pouch including a terrace formed by sealing the electrode assembly; 상기 파우치는 상기 리드탭이 인출되는 영역 이외의 영역에서 상기 테라스부가 접혀서 형성된 이차 전지.The pouch is a secondary battery formed by folding the terrace portion in a region other than the region where the lead tab is drawn out. 제 1 항에 있어서,The method of claim 1, 상기 전극 조립체의 함입부는 상기 리드탭이 인출된 영역 이외의 영역에 형성된 이차 전지.The recess of the electrode assembly is formed in a region other than the region where the lead tab is drawn out. 제 1 항에 있어서,The method of claim 1, 상기 파우치는 상기 전극 조립체의 함입부에 대응되는 영역에서 상기 전극 조립체에 대해 공간을 제공하는 공간부를 더 포함하여 형성된 이차 전지.The pouch further includes a space portion providing a space with respect to the electrode assembly in a region corresponding to the depression of the electrode assembly. 제 3 항에 있어서,The method of claim 3, wherein 상기 파우치는 접히는 상기 테라스부의 사이에서 중첩되어 형성되는 중첩부를 더 포함하고, 상기 중첩부는 상기 테라스부의 적어도 일면을 향해 접혀서 접촉되는 이차 전지.The pouch further includes an overlapping portion formed to overlap between the folded terrace portions, wherein the overlapping portion is folded and contacted toward at least one surface of the terrace portion. 제 1 항에 있어서,The method of claim 1, 상기 파우치는 일측 모서리로부터 상기 전극 조립체의 함입부를 향해 내측으로 접히고, 상기 리드탭이 인출되는 나머지 영역의 테라스부가 접혀서 형성된 이차 전지.The pouch is folded inward from the one side edge toward the recess of the electrode assembly, the secondary battery is formed by folding the terrace of the remaining area from which the lead tab is drawn. 제 5 항에 있어서,The method of claim 5, wherein 상기 파우치의 일측 모서리는 상기 전극 조립체의 함입부에 대응되는 영역을 향해 상기 일측 모서리로부터 대각선 방향으로 접혀서 형성된 이차 전지.One side edge of the pouch is formed by folding in a diagonal direction from the one edge toward the area corresponding to the depression of the electrode assembly. 제 5 항에 있어서,The method of claim 5, wherein 상기 테라스부는 인접한 한 쌍이 상기 일측 모서리의 중앙 영역에서 접하도록 형성되고, 내부를 향하는 경계를 기준으로 접히도록 형성된 이차 전지. The terrace unit is a secondary battery is formed so that the adjacent pair is in contact with the central area of the one corner, and folded so as to fold based on the boundary facing inward. 제 1 항에 있어서,The method of claim 1, 상기 파우치는 상기 전극 조립체의 함입부에 대응되어 외부로부터 함입되도록 형성된 함입부를 더 포함하는 이차 전지.The pouch further includes a recess formed to correspond to the recess of the electrode assembly from the outside. 제 8 항에 있어서,The method of claim 8, 상기 테라스부는 상기 함입부를 기준으로 각 영역이 구분되고, 각각의 상기 테라스부는 내부 영역에 대한 경계를 기준으로 접혀서 형성된 이차 전지.The terrace unit may be divided into regions based on the recesses, and each of the terrace units may be folded based on a boundary of an inner region. 제 8 항에 있어서,The method of claim 8, 상기 파우치는 상기 전극 조립체를 포함하는 전체 둘레를 따라 균일한 폭을 갖도록 형성된 이차 전지.The pouch is a secondary battery formed to have a uniform width along the entire circumference including the electrode assembly. 제 1 항에 있어서,The method of claim 1, 상기 파우치는 일측 모서리로부터 비정형인 상기 전극 조립체의 모서리를 향해 내측으로 접히고, 상기 리드탭이 인출되는 나머지 영역의 테라스부가 접혀서 형성된 이차 전지.The pouch is formed by folding the terrace portion of the remaining area from which one side edge is folded inwardly toward the corner of the amorphous electrode assembly and the lead tab is drawn out. 제 11 항에 있어서,The method of claim 11, 상기 파우치의 일측 모서리는 상기 전극 조립체를 따라 비정형으로 형성된 상기 파우치에서 적어도 하나의 인접한 변들의 사이에 대응되도록 형성되고, 상기 파우치의 내측을 향하도록 대각선 방향으로 접혀서 형성된 이차 전지.One side edge of the pouch is formed so as to correspond between at least one adjacent side in the pouch irregularly formed along the electrode assembly, the secondary battery formed by folding in a diagonal direction toward the inside of the pouch.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111933994A (en) * 2020-08-27 2020-11-13 曙鹏科技（深圳）有限公司 Soft package battery and edge sealing process thereof
US20230054400A1 (en) * 2020-02-27 2023-02-23 Lg Energy Solution, Ltd. Pouch Type Secondary Battery And Method For Manufacturing The Same
EP4398354A1 (en) * 2023-01-05 2024-07-10 SK On Co., Ltd. Folding method for battery pouch and lithium secondary battery including battery pouch
EP4465422A4 (en) * 2022-09-08 2025-04-30 LG Energy Solution, Ltd. BAG-TYPE BATTERY CELL AND BATTERY MODULE THEREOF

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102576860B1 (en) * 2018-03-30 2023-09-11 에스케이온 주식회사 Pouch case, and secondary battery and secondary battery pack using the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040054113A (en) * 2002-12-17 2004-06-25 삼성에스디아이 주식회사 Pouched-type case and lithium secondary battery applying the same
KR20080025436A (en) * 2006-09-18 2008-03-21 주식회사 엘지화학 Pouch type secondary battery with improved safety
KR100892049B1 (en) * 2006-01-16 2009-04-06 주식회사 엘지화학 Small Battery Pack
KR20150034600A (en) * 2013-09-26 2015-04-03 주식회사 엘지화학 Method of manufacturing electrode assembly and secondary battery
KR20160046160A (en) * 2014-10-20 2016-04-28 주식회사 엘지화학 Pouch-type secondary battery and method for manufacturing the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120137834A (en) * 2011-06-13 2012-12-24 주식회사 엘지화학 Pouched-type battery
KR101743577B1 (en) * 2014-04-28 2017-06-05 주식회사 엘지화학 Battery Cell Having Minimized Sealing Residue Portion
KR101891864B1 (en) * 2015-02-16 2018-08-24 주식회사 엘지화학 Apparatus for Shaping Separator and Battery Cell Manufactured by Using the Same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040054113A (en) * 2002-12-17 2004-06-25 삼성에스디아이 주식회사 Pouched-type case and lithium secondary battery applying the same
KR100892049B1 (en) * 2006-01-16 2009-04-06 주식회사 엘지화학 Small Battery Pack
KR20080025436A (en) * 2006-09-18 2008-03-21 주식회사 엘지화학 Pouch type secondary battery with improved safety
KR20150034600A (en) * 2013-09-26 2015-04-03 주식회사 엘지화학 Method of manufacturing electrode assembly and secondary battery
KR20160046160A (en) * 2014-10-20 2016-04-28 주식회사 엘지화학 Pouch-type secondary battery and method for manufacturing the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230054400A1 (en) * 2020-02-27 2023-02-23 Lg Energy Solution, Ltd. Pouch Type Secondary Battery And Method For Manufacturing The Same
CN111933994A (en) * 2020-08-27 2020-11-13 曙鹏科技（深圳）有限公司 Soft package battery and edge sealing process thereof
EP4465422A4 (en) * 2022-09-08 2025-04-30 LG Energy Solution, Ltd. BAG-TYPE BATTERY CELL AND BATTERY MODULE THEREOF
EP4398354A1 (en) * 2023-01-05 2024-07-10 SK On Co., Ltd. Folding method for battery pouch and lithium secondary battery including battery pouch

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