WO2022186491A1 - 원통형 이차전지 및 이차전지의 제조방법 - Google Patents
원통형 이차전지 및 이차전지의 제조방법 Download PDFInfo
- Publication number
- WO2022186491A1 WO2022186491A1 PCT/KR2022/001819 KR2022001819W WO2022186491A1 WO 2022186491 A1 WO2022186491 A1 WO 2022186491A1 KR 2022001819 W KR2022001819 W KR 2022001819W WO 2022186491 A1 WO2022186491 A1 WO 2022186491A1
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- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- uncoated region
- plate
- assembly
- electrode uncoated
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000005452 bending Methods 0.000 claims abstract description 42
- 238000004804 winding Methods 0.000 claims description 16
- 239000000758 substrate Substances 0.000 abstract description 24
- 238000003466 welding Methods 0.000 abstract description 19
- 230000035515 penetration Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910032387 LiCoO2 Inorganic materials 0.000 description 1
- 229910003005 LiNiO2 Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- 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
- An embodiment of the present invention relates to a cylindrical secondary battery having a reduced resistance structure and a method of manufacturing the secondary battery.
- a cylindrical secondary battery includes a cylindrical electrode assembly, a cylindrical can accommodating the electrode assembly and an electrolyte, and a cap coupled to the upper opening of the can to seal the can and flow current generated from the electrode assembly to an external device. Includes assembly.
- a secondary battery includes various internal resistance elements, such as a base resistance of an electrode assembly or a component resistance.
- various research and development are being conducted, such as adding a tab or changing the material of the cap assembly.
- a cylindrical secondary battery includes a cylindrical can having an open end; A first electrode plate having a first electrode uncoated region, a separator, and a second electrode plate having a second electrode uncoated region disposed in a direction opposite to the first electrode uncoated region are stacked, wound in a cylindrical shape, and accommodated in the can. electrode assembly; and a cap assembly closing the open end of the can while the electrode assembly is accommodated in the can, wherein at least one of the first electrode uncoated region and the second electrode uncoated region has an end bent to form a bending portion It is characterized by formation.
- a bending direction of the first electrode uncoated region and the second electrode uncoated region is an outer direction with respect to a winding axis of the electrode assembly.
- the electrode assembly is characterized in that it is wound after the bending portion is formed.
- It may further include a first electrode current collector plate electrically connecting the first electrode uncoated region and the can, and a second electrode current collector plate electrically connecting the second electrode uncoated region and the cap assembly.
- the present invention is a cylindrical can with one open end; an electrode assembly having a first electrode plate having a first electrode uncoated region, a separator, and a second electrode plate having a second electrode uncoated region disposed in a direction opposite to the first electrode uncoated region and accommodated in the can; and a cap assembly for closing an open end of the can while the electrode assembly is accommodated in the can, wherein at least one of the first electrode uncoated region and the second electrode uncoated region forming a bending part by bending an end of the ; and winding the electrode assembly after the bending part is formed.
- a bending direction of the first electrode uncoated region and the second electrode uncoated region is an outer direction with respect to a winding axis of the electrode assembly.
- the first electrode uncoated region, the first electrode current collector plate, and the second electrode uncoated region, and the second electrode current collector plate are welded, respectively, to the first electrode uncoated region, the can and the second electrode uncoated region.
- the method may further include electrically connecting the unit and the cap assembly.
- the thickness and amount of the base material that can be welded increases, and the space between the base materials is reduced, thereby increasing the heat capacity of the welded portion, which is advantageous for the welding process.
- the thickness and amount of the base material that can be welded increases, and the space between the base materials is reduced, thereby increasing the heat capacity of the welded portion, which is advantageous for the welding process.
- FIG. 1 is a perspective view illustrating a cylindrical secondary battery according to an embodiment of the present invention.
- FIG. 2 is a perspective view illustrating an electrode assembly and a current collecting structure according to FIG. 1 .
- FIG. 3 is a plan view schematically illustrating a state before winding of the electrode assembly according to the present invention.
- 4A and 4B are plan views illustrating a state before and after bending of a second electrode plate according to an embodiment of the present invention.
- 4C to 4E are longitudinal cross-sectional views sequentially illustrating a bending process of a second electrode plate according to an embodiment of the present invention.
- FIG. 5 is a longitudinal cross-sectional view schematically partially illustrating a state after winding of an electrode assembly according to an embodiment of the present invention.
- FIG. 6 is a longitudinal cross-sectional view illustrating a state of a second electrode plate before the current collector plate is coupled according to an embodiment of the present invention.
- first, second, etc. are used herein to describe various members, parts, regions, layers and/or parts, these members, parts, regions, layers, and/or parts are limited by these terms, so that It is self-evident that These terms are used only to distinguish one member, component, region, layer or portion from another region, layer or portion. Accordingly, a first member, component, region, layer, or portion discussed below may refer to a second member, component, region, layer or portion without departing from the teachings of the present invention.
- Space-related terms such as “beneath”, “below”, “lower”, “above”, and “upper” refer to an element or feature shown in the drawings and It may be used to facilitate understanding of other elements or features. These space-related terms are for easy understanding of the present invention according to various process conditions or usage conditions of the present invention, and are not intended to limit the present invention. For example, if an element or feature in a figure is turned over, an element or feature described as “below” or “below” becomes “above” or “above”. Accordingly, “lower” is a concept encompassing “upper” or "below”.
- FIG. 1 is a perspective view illustrating a cylindrical secondary battery according to an embodiment of the present invention.
- FIG. 2 is a perspective view illustrating an electrode assembly and a current collecting structure according to FIG. 1 .
- 3 is a plan view schematically illustrating a state before winding of the electrode assembly according to the present invention.
- the cylindrical secondary battery 10 includes a cylindrical can 110 , an electrode assembly 130 inserted into the can 110 , and one end of the can 110 . It may include a cap assembly 150 and a first electrode collector plate 170 and a second electrode collector plate 190 electrically connecting the electrode assembly 130 to the cap assembly 150 .
- the can 110 includes a circular bottom part 110 and a side part 130 extending upwardly from the bottom part 110 , and has a cylindrical shape (hereinafter, referred to as an opening) with an open top of the side part 130 .
- the electrode assembly 300 is inserted into the can 100 together with the electrolyte through the opening of the can 100 .
- the electrode assembly 130 is electrically connected to the can 110 and the cap assembly 150 by the first electrode plate 132 and the second electrode plate 134 .
- the can 100 may be formed of steel, a steel alloy, nickel-plated steel, nickel-plated steel alloy, aluminum, an aluminum alloy, or an equivalent thereof, but the material thereof is not limited herein.
- the cap assembly 150 is inserted into the opening to close the opening.
- the electrode assembly 130 includes a first electrode plate 132 , a second electrode plate 134 , and a separator 136 .
- the first electrode plate 132 may be a negative electrode plate in which negative active material layers 132c (eg, graphite, carbon, etc.) are formed on both surfaces.
- a first electrode uncoated region 132a to which the negative electrode active material layer 132C is not applied may be formed on a portion of the first electrode plate 132 .
- the second electrode plate 134 may be a positive electrode plate in which a positive active material layer 134c, for example, a transition metal oxide (LiCoO2, LiNiO2, LiMn2O4, etc.) is formed on both surfaces.
- a second electrode uncoated region 134a to which the positive electrode active material layer 134c is not applied may be formed on a portion of the second electrode plate 134 .
- the separator 136 may be interposed between the first electrode plate 132 and the second electrode plate 134 to prevent a short circuit and enable only movement of lithium ions.
- the first electrode plate 132 may be copper (Cu) or nickel (Ni) foil
- the second electrode plate 134 may be aluminum (Al) foil
- the separator 136 may be polyethylene (PE) or polypropylene (PP).
- PE polyethylene
- PP polypropylene
- the first electrode plate 132 , the second electrode plate 134 , and the separator 136 may be wound in a substantially cylindrical shape to be accommodated in the can 100 .
- the first electrode plate 132 and the second electrode plate 134 may be disposed so that the first electrode uncoated region 132a and the second electrode uncoated region 134a to which an active material is not applied for winding are opposite to each other. have.
- the first electrode plate 132 as the negative electrode plate may be disposed such that the first electrode uncoated region 132a faces downward with reference to FIG. 1 .
- the second electrode plate 134 which is a positive electrode plate, may be disposed to face upward with reference to FIG. 1 .
- a separator 136 may be disposed between the first electrode plate 132 and the second electrode plate 134 to insulate the first electrode plate 132 and the second electrode plate 134 .
- a process of folding the second electrode uncoated region 134a in an outer direction away from the winding axis (direction toward the can) before winding the electrode assembly 130 may be added (this will be described later) .
- the electrode assembly 130 is wound, and then the first electrode uncoated region 132a and the second electrode uncoated region 134a are covered with a first electrode collector plate 170 to be described later. and the second electrode current collecting plate 190 may be connected to each other. Accordingly, the can 110 and the cap assembly 150 are electrically connected to the electrode assembly 130 .
- the current collecting plate includes a first electrode current collecting plate 170 that electrically connects the first electrode plate 132 with the bottom surface of the can 110 , and a second electrode plate 134 with a cap.
- a second electrode collector plate 190 electrically connected to the assembly 150 may be included.
- the first electrode current collector plate 170 may be referred to as a negative electrode current collector plate
- the second electrode current collector plate 190 may be referred to as a positive electrode current collector plate.
- the first electrode current collecting plate 170 has a substantially circular plate shape, and electrically connects the first electrode plate 132 to the bottom surface 111 of the can 110 . To this end, a plurality of substrate current collectors 172 and a can connection portion 174 may be formed on the first electrode current collector plate 170 . The first electrode current collecting plate 170 may be electrically connected to the first electrode uncoated region 132a and the can 110 .
- the substrate current collector 172 is formed to have a predetermined length in a radial direction of the electrode assembly 130 (radial direction of the first electrode current collector).
- the base current collector 172 is formed to protrude in the radial direction in the remaining area except for a partial area of the central portion of the first electrode current collector 170 .
- the protruding direction of the substrate current collector 172 is in the direction of the cap assembly 150 , that is, the direction away from the bottom surface 112 of the can 110 .
- four substrate current collectors 172 may protrude at intervals of 90 degrees along the radial direction of the electrode assembly 130 .
- the radial length of the base material collector 172 may be a length obtained by subtracting the radius of the can connection portion 174 from the radius of the first electrode collector plate 170 .
- the substrate current collector 172 may be formed to protrude in a rectangular or circular cross-section.
- the first electrode uncoated region 132a may be welded to an upper surface of the protruding surfaces of the substrate current collector 172 .
- the upper surface of the base material current collector 172 is defined as the welding surface 172a.
- a can connection part 174 may be formed in a central portion of the first electrode current collecting plate 170 .
- the can connection part 174 may be formed to protrude toward the bottom part 112 of the can 110 from the plate surface of the central portion of the first electrode current collecting plate 170 .
- the can connection part 174 may protrude in a cylindrical shape, a tetrahedral shape, or the like.
- the can connection part 174 may be electrically and physically connected to the bottom part 112 of the can 110 by welding.
- the second electrode current collecting plate 190 is symmetrically installed to face the first electrode current collecting plate 170 with the electrode assembly 130 interposed therebetween.
- the second electrode current collecting plate 190 has a substantially disk shape, and electrically connects the second electrode plate 134 to the cap assembly 150 .
- a plurality of substrate current collectors 192 to be electrically connected to the second electrode uncoated region 134a may be formed on the second electrode current collecting plate 190 .
- a current collecting tab 194 for electrically connecting to the cap assembly 150 may be formed on the second electrode current collecting plate 190 .
- the second electrode current collecting plate 190 may be electrically connected to the second electrode uncoated region 134a.
- the second electrode current collecting plate 190 may be electrically connected to the cap assembly 150 by the current collecting tab 194 .
- the substrate current collector 192 is formed to have a predetermined length along the radial direction of the electrode assembly 130 (the radial direction of the second electrode current collector).
- the base current collector 192 is formed to protrude in a radial direction in the remaining area except for a partial area of the central portion of the second electrode current collector 190 .
- a circular hollow 190a may be formed in a central portion of the second electrode current collector 190 .
- the protruding direction of the substrate current collector 192 is in a direction opposite to the cap assembly 150 , that is, toward the bottom surface 112 of the can 110 .
- four substrate current collectors 192 may be formed to protrude at intervals of 90 degrees along the radial direction of the electrode assembly 130 .
- the radial length of the base current collector 192 may be a length obtained by subtracting the radius of the hollow 190a from the radius of the second electrode current collecting plate 190 .
- the substrate current collector 192 may be formed to protrude in a rectangular or circular cross-section.
- the second electrode uncoated region 134a may be welded to the lower surface of the protruding surfaces of the base material current collector 192 .
- the lower surface of the base material current collector 192 is defined as the welding surface (192a).
- the above-described current collecting tab 194 may be formed at any position between the substrate current collecting units 192 .
- the current collecting tab 194 may protrude from one side of the second electrode current collecting plate 190 in an outward direction (a direction toward the can). That is, the current collecting tab 194 may have a shape in which a portion of the plate surface of the second electrode current collecting plate 190 is extended. The current collecting tab 194 may have a predetermined size, and may have a thickness equal to or thinner than that of the second electrode current collecting plate 190 . The current collecting tab 194 may be bent toward the cap assembly 150 while the second electrode current collecting plate 190 is welded to the second electrode uncoated region 134a to be welded to the cap assembly 150 . . Accordingly, the second electrode current collecting plate 190 and the cap assembly 150 may be electrically connected, and the second electrode plate 134 may be electrically connected with the cap assembly 150 .
- the aforementioned second electrode plate 134 may include a bending portion 134b formed by folding or bending a portion of the second electrode uncoated region 134a.
- 4A and 4B are plan views illustrating a state before and after bending of a second electrode plate according to an embodiment of the present invention.
- 4C to 4E are longitudinal cross-sectional views sequentially illustrating a bending process of a second electrode plate according to an embodiment of the present invention.
- 5 is a longitudinal cross-sectional view schematically partially illustrating a state after winding of an electrode assembly according to an embodiment of the present invention.
- 6 is a longitudinal cross-sectional view showing the state of the second electrode plate before the current collector plate is coupled according to an embodiment of the present invention (for convenience, the first electrode plate is not shown in FIGS. 4A to 4E ).
- the second electrode plate 134 is in a state in which the second electrode uncoated region 134a is not bent before bending.
- the bending portion 134b may be formed by bending or folding the second electrode uncoated portion 134a as shown in FIGS. 4B, 4D, and 4E.
- the bending part 134b may be made by inserting a separate jig or guide between the base roll and the roll during the manufacturing process.
- the direction in which the second electrode uncoated region 134a is folded is an outer direction that is a direction away from the winding axis with respect to the winding axis when the electrode assembly 130 is wound.
- the second electrode uncoated region 134a may be bent or folded in a direction opposite to the inner direction of the electrode assembly 130 (the direction in which the active material layer is located) as shown in FIG. 5 .
- the reason is to prevent the bent end of the second electrode uncoated region 134a from digging into the electrode assembly 130 (to prevent damage to the inside of the electrode assembly).
- the second electrode uncoated region 134a may be bent in a streamlined shape as shown in FIG. 4D to form a bending portion 134b.
- the second electrode uncoated region 134a may be completely folded to form a bending portion 134b as shown in FIG. 4E .
- the electrode assembly 130 After forming the bending portion 134b as described above, the electrode assembly 130 is wound. After winding, the electrode assembly 130 is pressed in the arrow direction by the second electrode current collector plate 190 as shown in FIG. 6 in a state in which the bending part 134b is formed in the second electrode uncoated region 134a as shown in FIG. After that, welding is performed with the second electrode current collector plate 190 .
- the direction in which the bending portion 134b is pressed by the second electrode current collector 190 and laid down is a direction in which the folded end of the bending portion 134b faces the cap assembly 150 as described above. Therefore, when the second electrode current collector plate 190 is welded, the end of the bending part 134b does not go toward the inside of the electrode assembly 130 . Accordingly, it is possible to prevent damage to the inside of the electrode assembly 130 due to the bending portion 134b.
- FIG. 5 shows the first electrode plate 132 and the second electrode plate 134 exaggeratedly, so that the gap between the second electrode uncoated regions 134a is widely expressed.
- An interval between the two electrode uncoated regions 134a may be maintained enough to partially overlap the adjacent second electrode uncoated regions 134a.
- the distance between the uncoated regions may vary.
- an effect of increasing the thickness of the second electrode uncoated region 134a occurs by forming the bending portion 134b. Accordingly, the thickness and amount of the base material that can be welded during welding with the second electrode current collector plate 190 increases, and the space between the base materials is reduced, thereby increasing the heat capacity of the welded portion, which is advantageous for the welding process.
- the bending portion 134b is formed only on the second electrode uncoated portion 134a
- the bending portion may also be formed on the first electrode uncoated portion 132a.
- the bending part formed on the first electrode uncoated part 132a may also bring about the same effect as described above.
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- Electrochemistry (AREA)
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
Claims (7)
- 일단이 개방된 원통형의 캔;제1 전극 무지부를 구비한 제1 전극판, 세퍼레이터, 상기 제1 전극 무지부와 대향되는 방향으로 배치되는 제2 전극 무지부를 구비한 제2 전극판이 적층되어 원통형으로 권취되며, 상기 캔에 수용되는 전극 조립체; 및상기 전극 조립체가 상기 캔에 수용된 상태에서 상기 캔의 개방된 일단을 폐쇄하는 캡 어셈블리를 포함하고,상기 제1 전극 무지부와 상기 제2 전극 무지부 중 적어도 어느 하나는 단부가 벤딩되어 벤딩부가 형성된 이차전지.
- 제 1 항에 있어서,상기 제1 전극 무지부와 상기 제2 전극 무지부의 벤딩 방향은 상기 전극 조립체의 권취축을 중심으로 외곽 방향인 이차전지.
- 제 2 항에 있어서,상기 전극 조립체는 상기 벤딩부가 형성된 후 권취되는 이차전지.
- 제 3 항에 있어서,상기 제1 전극 무지부와 상기 캔을 전기적으로 연결하는 제1 전극 집전판과, 상기 제2 전극 무지부와 상기 캡 어셈블리를 전기적으로 연결하는 제2 전극 집전판을 더 포함하는 이차전지.
- 일단이 개방된 원통형의 캔; 제1 전극 무지부를 구비한 제1 전극판, 세퍼레이터, 상기 제1 전극 무지부와 대향되는 방향으로 배치되는 제2 전극 무지부를 구비한 제2 전극판을 가지며 상기 캔에 수용되는 전극 조립체; 및 상기 전극 조립체가 상기 캔에 수용된 상태에서 상기 캔의 개방된 일단을 폐쇄하는 캡 어셈블리를 포함하는 이차전지의 제조방법에 있어서,상기 제1 전극 무지부와 상기 제2 전극 무지부 중 적어도 어느 하나의 단부를 벤딩하여 벤딩부를 형성하는 단계; 및상기 벤딩부가 형성된 후 상기 전극 조립체를 권취하는 단계를 포함하는 이차전지의 제조방법.
- 제 5 항에 있어서,상기 제1 전극 무지부와 상기 제2 전극 무지부의 벤딩 방향은 상기 전극 조립체의 권취축을 중심으로 외곽 방향인 이차전지의 제조방법.
- 제 5 항에 있어서,상기 벤딩부가 형성된 후, 상기 제1 전극 무지부와 제1 전극 집전판 및 상기 제2 전극 무지부와 제2 전극 집전판을 각각 용접해 상기 제1 전극 무지부와 상기 캔 및 상기 제2 전극 무지부와 상기 캡 어셈블리를 전기적으로 연결하는 단계를 더 포함하는 이차전지의 제조방법.
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JP2001256954A (ja) * | 2000-03-10 | 2001-09-21 | Sony Corp | 蓄電装置 |
JP2006004729A (ja) * | 2004-06-17 | 2006-01-05 | Matsushita Electric Ind Co Ltd | 電気化学素子 |
JP2007227137A (ja) * | 2006-02-23 | 2007-09-06 | Matsushita Electric Ind Co Ltd | 密閉型蓄電池 |
JP2014222683A (ja) * | 2013-05-13 | 2014-11-27 | 日本ケミコン株式会社 | コンデンサおよびその製造方法 |
KR20200143979A (ko) * | 2019-06-17 | 2020-12-28 | 삼성에스디아이 주식회사 | 전극 조립체 및 이를 포함하는 이차 전지 |
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JP2001256954A (ja) * | 2000-03-10 | 2001-09-21 | Sony Corp | 蓄電装置 |
JP2006004729A (ja) * | 2004-06-17 | 2006-01-05 | Matsushita Electric Ind Co Ltd | 電気化学素子 |
JP2007227137A (ja) * | 2006-02-23 | 2007-09-06 | Matsushita Electric Ind Co Ltd | 密閉型蓄電池 |
JP2014222683A (ja) * | 2013-05-13 | 2014-11-27 | 日本ケミコン株式会社 | コンデンサおよびその製造方法 |
KR20200143979A (ko) * | 2019-06-17 | 2020-12-28 | 삼성에스디아이 주식회사 | 전극 조립체 및 이를 포함하는 이차 전지 |
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