US20140147716A1 - Jelly-roll of improved productivity and battery cell comprising the same - Google Patents
Jelly-roll of improved productivity and battery cell comprising the same Download PDFInfo
- Publication number
- US20140147716A1 US20140147716A1 US14/170,979 US201414170979A US2014147716A1 US 20140147716 A1 US20140147716 A1 US 20140147716A1 US 201414170979 A US201414170979 A US 201414170979A US 2014147716 A1 US2014147716 A1 US 2014147716A1
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- United States
- Prior art keywords
- jelly roll
- battery
- electrode tabs
- electrode
- sheet
- 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.)
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Links
- 238000003466 welding Methods 0.000 claims abstract description 39
- 235000015110 jellies Nutrition 0.000 claims abstract description 27
- 239000008274 jelly Substances 0.000 claims abstract description 27
- 239000007772 electrode material Substances 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims abstract description 7
- 230000000994 depressogenic effect Effects 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 1
- 238000009413 insulation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- H01M10/05—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- 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
- H01M50/534—Electrode connections inside a battery casing characterised by the material 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
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/38—Conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
Definitions
- the present invention relates to a jelly roll exhibiting improved productivity and a battery cell including the same, and, more particularly, to a jelly roll for a secondary battery configured by winding a cathode sheet, a separator, and an anode sheet, wherein electrode tabs are connected to uncoated portions of the electrode sheets, to which electrode active materials are not applied, by welding, and each of the electrode tabs is configured to have an embossed structure protruding toward the uncoated portion to improve weldability.
- a secondary battery may be classified as a cylindrical battery having an electrode assembly mounted in a cylindrical metal container, a prismatic battery having an electrode assembly mounted in a prismatic metal container, or a pouch-shaped battery having an electrode assembly mounted in a pouch-shaped case formed of an aluminum laminate sheet.
- the cylindrical battery has advantages in that the cylindrical battery has relatively large capacity and is structurally stable.
- the electrode assembly mounted in the battery case serves as a power generating element, having a cathode/separator/anode stack structure, which can be charged and discharged.
- the electrode assembly may be classified as a jelly roll type electrode assembly configured to have a structure in which a long sheet type cathode and a long sheet type anode, to which active materials are applied, are wound in a state in which a separator is disposed between the cathode and the anode, a stacked type electrode assembly configured to have a structure in which a plurality of cathodes having a predetermined size and a plurality of anodes having a predetermined size are sequentially stacked in a state in which separators are disposed respectively between the cathodes and the anodes, or a stacked/folded type electrode assembly, which is a combination of the a jelly roll type electrode assembly and the stacked type electrode assembly.
- FIG. 1 the structure of a conventional cylindrical secondary battery is shown in FIG. 1 .
- a cylindrical secondary battery 100 is manufactured by mounting a jelly roll type (wound type) electrode assembly 120 in a battery case 130 , injecting an electrolyte into the battery case 130 , and coupling a cap assembly 140 having an electrode terminal (for example, a cathode terminal, which is not shown) to the upper end, which is open, of the battery case 130 .
- a jelly roll type (wound type) electrode assembly 120 in a battery case 130
- injecting an electrolyte into the battery case 130
- a cap assembly 140 having an electrode terminal (for example, a cathode terminal, which is not shown) to the upper end, which is open, of the battery case 130 .
- the electrode assembly 120 is configured to have a structure in which a cathode sheet 121 and an anode sheet 122 are wound in a circle in a state in which a separator 123 is disposed between the cathode sheet 121 and the anode sheet 122 .
- a cylindrical center pin 150 is fitted in the core of the electrode assembly 120 (the center of the jelly roll).
- the center pin 150 is generally made of a metal material to exhibit predetermined strength.
- the center pin 150 is configured to have a hollow cylindrical structure formed by rolling a sheet type material.
- the center pin 150 serves to fix and support the electrode assembly. Also, the center pin 150 serves as a passage to discharge gas generated by internal reaction of the secondary battery when charging and discharging the secondary battery and when operating the secondary battery.
- An insulation member 160 which is configured to have a sheet type structure, is mounted at the upper end of the electrode assembly 120 .
- the insulation member 160 is provided at the center thereof with an opening communicating with a through hole 151 of the center pin 150 , through which gas can be discharged and through which a cathode tab 142 of the electrode assembly 120 can be connected to a cap plate 145 of the cap assembly 140 .
- an insulation member 170 is disposed at the lower end of the cylindrical secondary battery 100 .
- the insulation member 170 is located between the lower end of the electrode assembly 120 and the battery case 130 .
- the insulation member 170 is provided at the center thereof with an opening, through which an anode tab (not shown) attached to the anode sheet 122 is connected to the lower end of the battery case 130 .
- the cathode tab and the anode tab are generally connected to uncoated portions of the cathode sheet and the anode sheet (portions of the electrode sheets, i.e. metal current collectors, to which electrode active materials are not applied) by ultrasonic welding.
- ultrasonic welding between the cathode sheet and the cathode tab is typically shown in a sectional view of FIG. 2 .
- the cathode tab 142 is disposed on an uncoated portion 121 a of the cathode sheet in contact with the uncoated portion 121 a of the cathode sheet, and the cathode tab 142 is pressed by an ultrasonic welding device 300 including a plurality of horn tips 310 . At this time, ultrasonic vibration is transmitted to the cathode tab 142 , and the cathode tab 142 is welded to the uncoated portion 121 a of the cathode sheet by frictional heat generated as the result of the ultrasonic vibration.
- the cathode tab and the cathode sheet are flat with the result that the cathode tab may wear down when ultrasonic welding is performed in a state in which the horn tips are in contact with the cathode tab.
- high coupling between the cathode tab and the cathode sheet is required, and therefore, electrode active materials may be separated from the cathode sheet during welding based on the application of high ultrasonic waves.
- the present invention has been made to solve the above problems, and other technical problems that have yet to be resolved.
- a secondary battery configured by winding a cathode sheet, a separator, and an anode sheet, wherein electrode tabs are connected to uncoated portions of the electrode sheets, to which electrode active materials are not applied, by welding, and each of the electrode tabs is configured to have an embossed structure protruding toward the uncoated portion to improve weldability.
- the embossed structures as described above are formed at the jelly roll according to the present invention.
- high friction between the electrode tabs (specifically, portions having the embossed structures) and the uncoated portions of the electrode sheets is achieved although a vibration energy level is lowered during welding, thereby improving weldability between the electrode tabs and the uncoated portions.
- the electrode tabs may be made of aluminum or nickel.
- the cathode tab may be made of aluminum, and the anode tab may be made of nickel; however, the present invention is not limited thereto.
- the embossed structure may include a plurality of micro protrusions configured to have a structure having protruding parts formed at one side thereof facing the uncoated portion and depressed parts formed at the other side thereof so as to correspond to the protrusions.
- the shape of the protruding parts and the depressed parts is not particularly restricted.
- the protruding parts and the depressed parts are formed in the shape of a hemisphere.
- each of the micro protrusions has a protruding height of 50 to 500 microns. If the protruding height is too high, welding between the electrode tabs and the uncoated portions is not easily achieved, which is not preferable. On the other hand, if the protruding height is too high, it is difficult for the embossed structures to function, which is not also preferable. More preferably, each of the micro protrusions has a protruding height of 100 to 150 microns.
- the electrode tabs are connected to the uncoated portions, preferably, by ultrasonic welding to minimize deformation of welded portions and to achieve easy application with respect to thin uncoated portions.
- the ultrasonic welding may be performed by a welding device comprising horn tips arranged at intervals corresponding to the micro protrusions of the embossed structure.
- the ultrasonic welding may be performed by applying ultrasonic waves in a state in which the horn tips are located in the depressed parts of the respective micro protrusions.
- each of the horn tips contacting the electrode tabs it is necessary for the height of each of the horn tips contacting the electrode tabs to be about 350 microns so that vibration energy generated from the horn tips can be effectively transmitted to the corresponding surfaces of the electrode sheets contacting the electrode tabs.
- the horn tips the height of which is relatively high, may be easily damaged.
- the electrode tabs may be worn by the horn tips.
- the protruding parts are formed at the regions of the electrode tabs corresponding to the depressed parts of the electrode tabs, in which the horn tips are located, i.e. the regions of the electrode tabs facing the uncoated portions, and therefore, it is possible to provide high weldability simply by reducing the height of each of the horn tips. Consequently, it is possible to solve problems, such as wear of the electrode tabs.
- each of the horn tips preferably has a height of 50 to 300 microns, more preferably about 100 microns.
- each of the horn tips 320 may have an angle of 60 to 120 degrees.
- each of the horn tips is formed in the shape of a pyramid having an angle of 90 degrees.
- the method of manufacturing the jelly roll includes (a) winding a cathode sheet and an anode sheet in a state in which a separator is disposed between the cathode sheet and the anode sheet, (b) positioning electrode tabs each having an embossed structure formed at a surface thereof on uncoated portions of the cathode sheet and the anode sheet so that protruding parts of the embossed structure face a corresponding one of the uncoated portions, and (c) positioning horn tips of a welding device in depressed parts of the embossed structure of each of the electrode tabs and applying ultrasonic waves to the depressed parts.
- ultrasonic welding is performed using the horn tips corresponding to the embossed structure, thereby minimizing wear of the electrode tabs and improving weldability between the electrode tabs and the uncoated portions.
- a battery cell including the jelly roll, wherein the jelly roll is mounted in a battery case.
- the battery cell is a secondary battery which can be continuously charged and discharged.
- the battery cell may be configured in various forms, such as a prismatic battery and a cylindrical battery cell.
- the battery cell is a cylindrical battery cell.
- the battery cell is preferably applied to a middle or large-sized battery module of high power and large capacity comprising a plurality of battery cells as unit cells by virtue of excellent weldability.
- the structure of the middle or large-sized battery module and a method of manufacturing the same are well known in the art to which the present invention pertains, and a detailed description thereof will be omitted.
- the jelly roll according to the present invention has the embossed structures protruding toward the uncoated portions. Consequently, it is possible to minimize wear of the electrode tabs and to improve weldability, thereby improving safety of the battery cell.
- FIG. 1 is a vertical sectional perspective view showing a conventional cylindrical secondary battery
- FIG. 2 is a partial sectional view showing welding between a cathode sheet and a cathode tab of FIG. 1 ;
- FIG. 3 is a partial sectional view showing welding between a cathode sheet and a cathode tab according to an embodiment of the present invention
- FIG. 4 is a front view showing a welding device according to the present invention with a partial side view of the welding device.
- FIG. 5 is a photograph showing a portion of an electrode tab of FIG. 3 .
- FIG. 3 is a partial sectional view showing welding between a cathode sheet and a cathode tab according to an embodiment of the present invention
- FIG. 4 is a front view showing a welding device of FIG. 3 with a partial side view of the welding device
- FIG. 5 is a photograph showing a portion of an electrode tab of FIG. 3 .
- a jelly roll 120 for a secondary battery is configured by winding a cathode sheet 121 , a separator 123 , and an anode sheet 122 .
- a cathode tab 200 which is made of a nickel material, is connected to an uncoated portion 121 a of the cathode sheet 121 , to which an electrode active material is not applied, by ultrasonic welding.
- the cathode tab 200 is configured to have an embossed structure which protrudes toward the uncoated portion 121 a to improve weldability.
- the embossed structure includes a plurality of micro protrusions 210 configured to have a structure having protruding parts 212 formed at one side thereof facing the uncoated portion 121 a and depressed parts 214 formed at the other side thereof so as to correspond to the protrusions 212 .
- Each of the micro protrusions 210 has a protruding height H of about 120 microns.
- ultrasonic welding is performed by a welding device 300 including horn tips 320 arranged at intervals corresponding to the micro protrusions 210 of the embossed structure.
- the welding device 300 includes horn tips 320 arranged in a 3 ⁇ 9 matrix.
- Each of the horn tips 320 has a height L of about 100 microns.
- each of the horn tips 320 is formed in the shape of a pyramid having an angle R of 90 degrees.
- Ultrasonic welding is performed by applying ultrasonic waves in a state in which the horn tips are located in the depressed parts 214 of the respective micro protrusions 210 . Consequently, it is possible to minimize wear of the electrode tab even in a case in which horn tips 320 , the height of each of which is low, are used.
- Such ultrasonic welding may be performed with respect to an anode tab, which is made of an aluminum material, in the same manner.
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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)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
Disclosed herein is a jelly roll for a secondary battery configured by winding a cathode sheet, a separator, and an anode sheet, wherein electrode tabs are connected to uncoated portions of the electrode sheets, to which electrode active materials are not applied, by welding, and each of the electrode tabs is configured to have an embossed structure protruding toward the uncoated portion to improve weldability.
Description
- The present invention relates to a jelly roll exhibiting improved productivity and a battery cell including the same, and, more particularly, to a jelly roll for a secondary battery configured by winding a cathode sheet, a separator, and an anode sheet, wherein electrode tabs are connected to uncoated portions of the electrode sheets, to which electrode active materials are not applied, by welding, and each of the electrode tabs is configured to have an embossed structure protruding toward the uncoated portion to improve weldability.
- As mobile devices have been increasingly developed, and the demand for such mobile devices has increased, the demand for secondary batteries has also sharply increased. Among such secondary batteries is a lithium secondary battery exhibiting high energy density and operating voltage and excellent preservation and service-life characteristics, which has been widely used as an energy source for various electronic products as well as mobile devices.
- Based on the shape of a battery case, a secondary battery may be classified as a cylindrical battery having an electrode assembly mounted in a cylindrical metal container, a prismatic battery having an electrode assembly mounted in a prismatic metal container, or a pouch-shaped battery having an electrode assembly mounted in a pouch-shaped case formed of an aluminum laminate sheet. The cylindrical battery has advantages in that the cylindrical battery has relatively large capacity and is structurally stable.
- The electrode assembly mounted in the battery case serves as a power generating element, having a cathode/separator/anode stack structure, which can be charged and discharged. The electrode assembly may be classified as a jelly roll type electrode assembly configured to have a structure in which a long sheet type cathode and a long sheet type anode, to which active materials are applied, are wound in a state in which a separator is disposed between the cathode and the anode, a stacked type electrode assembly configured to have a structure in which a plurality of cathodes having a predetermined size and a plurality of anodes having a predetermined size are sequentially stacked in a state in which separators are disposed respectively between the cathodes and the anodes, or a stacked/folded type electrode assembly, which is a combination of the a jelly roll type electrode assembly and the stacked type electrode assembly.
- In this connection, the structure of a conventional cylindrical secondary battery is shown in
FIG. 1 . - Referring to
FIG. 1 , a cylindricalsecondary battery 100 is manufactured by mounting a jelly roll type (wound type)electrode assembly 120 in abattery case 130, injecting an electrolyte into thebattery case 130, and coupling acap assembly 140 having an electrode terminal (for example, a cathode terminal, which is not shown) to the upper end, which is open, of thebattery case 130. - The
electrode assembly 120 is configured to have a structure in which acathode sheet 121 and ananode sheet 122 are wound in a circle in a state in which aseparator 123 is disposed between thecathode sheet 121 and theanode sheet 122. Acylindrical center pin 150 is fitted in the core of the electrode assembly 120 (the center of the jelly roll). Thecenter pin 150 is generally made of a metal material to exhibit predetermined strength. Thecenter pin 150 is configured to have a hollow cylindrical structure formed by rolling a sheet type material. Thecenter pin 150 serves to fix and support the electrode assembly. Also, thecenter pin 150 serves as a passage to discharge gas generated by internal reaction of the secondary battery when charging and discharging the secondary battery and when operating the secondary battery. - An
insulation member 160, which is configured to have a sheet type structure, is mounted at the upper end of theelectrode assembly 120. Theinsulation member 160 is provided at the center thereof with an opening communicating with a throughhole 151 of thecenter pin 150, through which gas can be discharged and through which acathode tab 142 of theelectrode assembly 120 can be connected to acap plate 145 of thecap assembly 140. - Also, an
insulation member 170 is disposed at the lower end of the cylindricalsecondary battery 100. Theinsulation member 170 is located between the lower end of theelectrode assembly 120 and thebattery case 130. Theinsulation member 170 is provided at the center thereof with an opening, through which an anode tab (not shown) attached to theanode sheet 122 is connected to the lower end of thebattery case 130. - The cathode tab and the anode tab are generally connected to uncoated portions of the cathode sheet and the anode sheet (portions of the electrode sheets, i.e. metal current collectors, to which electrode active materials are not applied) by ultrasonic welding.
- Specifically, ultrasonic welding between the cathode sheet and the cathode tab is typically shown in a sectional view of
FIG. 2 . - Referring to
FIG. 2 , thecathode tab 142 is disposed on anuncoated portion 121 a of the cathode sheet in contact with theuncoated portion 121 a of the cathode sheet, and thecathode tab 142 is pressed by anultrasonic welding device 300 including a plurality ofhorn tips 310. At this time, ultrasonic vibration is transmitted to thecathode tab 142, and thecathode tab 142 is welded to theuncoated portion 121 a of the cathode sheet by frictional heat generated as the result of the ultrasonic vibration. - However, the cathode tab and the cathode sheet are flat with the result that the cathode tab may wear down when ultrasonic welding is performed in a state in which the horn tips are in contact with the cathode tab. Also, high coupling between the cathode tab and the cathode sheet is required, and therefore, electrode active materials may be separated from the cathode sheet during welding based on the application of high ultrasonic waves.
- Therefore, there is a high necessity for technology to fundamentally solve the above problems.
- Therefore, the present invention has been made to solve the above problems, and other technical problems that have yet to be resolved.
- It is an object of the present invention to provide a jelly roll in which an embossed structure is formed at each electrode tab, preventing wear of the electrode tabs and improving weldability during ultrasonic welding.
- It is another object of the present invention to provide a secondary battery using the jelly roll with improved productivity and safety.
- In accordance with one aspect of the present invention, the above and other objects can be accomplished by the provision of a secondary battery configured by winding a cathode sheet, a separator, and an anode sheet, wherein electrode tabs are connected to uncoated portions of the electrode sheets, to which electrode active materials are not applied, by welding, and each of the electrode tabs is configured to have an embossed structure protruding toward the uncoated portion to improve weldability.
- That is, the embossed structures as described above are formed at the jelly roll according to the present invention. When comparing with the conventional structure in which welding is performed with respect to flat electrode tabs, therefore, high friction between the electrode tabs (specifically, portions having the embossed structures) and the uncoated portions of the electrode sheets is achieved although a vibration energy level is lowered during welding, thereby improving weldability between the electrode tabs and the uncoated portions.
- The electrode tabs may be made of aluminum or nickel. For example, the cathode tab may be made of aluminum, and the anode tab may be made of nickel; however, the present invention is not limited thereto.
- In a preferred example, the embossed structure may include a plurality of micro protrusions configured to have a structure having protruding parts formed at one side thereof facing the uncoated portion and depressed parts formed at the other side thereof so as to correspond to the protrusions.
- The shape of the protruding parts and the depressed parts is not particularly restricted. Preferably, the protruding parts and the depressed parts are formed in the shape of a hemisphere.
- Preferably, each of the micro protrusions has a protruding height of 50 to 500 microns. If the protruding height is too high, welding between the electrode tabs and the uncoated portions is not easily achieved, which is not preferable. On the other hand, if the protruding height is too high, it is difficult for the embossed structures to function, which is not also preferable. More preferably, each of the micro protrusions has a protruding height of 100 to 150 microns.
- Meanwhile, the electrode tabs are connected to the uncoated portions, preferably, by ultrasonic welding to minimize deformation of welded portions and to achieve easy application with respect to thin uncoated portions.
- Concretely, the ultrasonic welding may be performed by a welding device comprising horn tips arranged at intervals corresponding to the micro protrusions of the embossed structure.
- Consequently, welding is performed by the horn tips corresponding to the micro protrusions, thereby maximizing weldability between the electrode tabs and the uncoated portions.
- Also, the ultrasonic welding may be performed by applying ultrasonic waves in a state in which the horn tips are located in the depressed parts of the respective micro protrusions.
- In the conventional ultrasonic welding, it is necessary for the height of each of the horn tips contacting the electrode tabs to be about 350 microns so that vibration energy generated from the horn tips can be effectively transmitted to the corresponding surfaces of the electrode sheets contacting the electrode tabs. However, the horn tips, the height of which is relatively high, may be easily damaged. In addition, the electrode tabs may be worn by the horn tips.
- According to the present invention, on the other hand, the protruding parts are formed at the regions of the electrode tabs corresponding to the depressed parts of the electrode tabs, in which the horn tips are located, i.e. the regions of the electrode tabs facing the uncoated portions, and therefore, it is possible to provide high weldability simply by reducing the height of each of the horn tips. Consequently, it is possible to solve problems, such as wear of the electrode tabs.
- Concretely, each of the horn tips preferably has a height of 50 to 300 microns, more preferably about 100 microns.
- Meanwhile, each of the
horn tips 320 may have an angle of 60 to 120 degrees. Preferably, each of the horn tips is formed in the shape of a pyramid having an angle of 90 degrees. - In accordance with another aspect of the present invention, there is provided a method of manufacturing the jelly roll. Concretely, the method of manufacturing the jelly roll includes (a) winding a cathode sheet and an anode sheet in a state in which a separator is disposed between the cathode sheet and the anode sheet, (b) positioning electrode tabs each having an embossed structure formed at a surface thereof on uncoated portions of the cathode sheet and the anode sheet so that protruding parts of the embossed structure face a corresponding one of the uncoated portions, and (c) positioning horn tips of a welding device in depressed parts of the embossed structure of each of the electrode tabs and applying ultrasonic waves to the depressed parts.
- That is, ultrasonic welding is performed using the horn tips corresponding to the embossed structure, thereby minimizing wear of the electrode tabs and improving weldability between the electrode tabs and the uncoated portions.
- In accordance with another aspect of the present invention, there is provided a battery cell including the jelly roll, wherein the jelly roll is mounted in a battery case.
- The battery cell is a secondary battery which can be continuously charged and discharged. The battery cell may be configured in various forms, such as a prismatic battery and a cylindrical battery cell. Preferably, the battery cell is a cylindrical battery cell.
- Also, the battery cell is preferably applied to a middle or large-sized battery module of high power and large capacity comprising a plurality of battery cells as unit cells by virtue of excellent weldability.
- The structure of the middle or large-sized battery module and a method of manufacturing the same are well known in the art to which the present invention pertains, and a detailed description thereof will be omitted.
- As is apparent from the above description, the jelly roll according to the present invention has the embossed structures protruding toward the uncoated portions. Consequently, it is possible to minimize wear of the electrode tabs and to improve weldability, thereby improving safety of the battery cell.
- The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a vertical sectional perspective view showing a conventional cylindrical secondary battery; -
FIG. 2 is a partial sectional view showing welding between a cathode sheet and a cathode tab ofFIG. 1 ; -
FIG. 3 is a partial sectional view showing welding between a cathode sheet and a cathode tab according to an embodiment of the present invention; -
FIG. 4 is a front view showing a welding device according to the present invention with a partial side view of the welding device; and -
FIG. 5 is a photograph showing a portion of an electrode tab ofFIG. 3 . - Now, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. It should be noted, however, that the scope of the present invention is not limited by the illustrated embodiment.
-
FIG. 3 is a partial sectional view showing welding between a cathode sheet and a cathode tab according to an embodiment of the present invention,FIG. 4 is a front view showing a welding device ofFIG. 3 with a partial side view of the welding device, andFIG. 5 is a photograph showing a portion of an electrode tab ofFIG. 3 . - Referring to these drawings together with
FIG. 1 , ajelly roll 120 for a secondary battery is configured by winding acathode sheet 121, aseparator 123, and ananode sheet 122. Acathode tab 200, which is made of a nickel material, is connected to anuncoated portion 121 a of thecathode sheet 121, to which an electrode active material is not applied, by ultrasonic welding. Thecathode tab 200 is configured to have an embossed structure which protrudes toward theuncoated portion 121 a to improve weldability. - The embossed structure includes a plurality of
micro protrusions 210 configured to have a structure having protrudingparts 212 formed at one side thereof facing theuncoated portion 121 a anddepressed parts 214 formed at the other side thereof so as to correspond to theprotrusions 212. - Each of the
micro protrusions 210 has a protruding height H of about 120 microns. - Meanwhile, ultrasonic welding is performed by a
welding device 300 includinghorn tips 320 arranged at intervals corresponding to themicro protrusions 210 of the embossed structure. - The
welding device 300 includeshorn tips 320 arranged in a 3×9 matrix. Each of thehorn tips 320 has a height L of about 100 microns. Also, each of thehorn tips 320 is formed in the shape of a pyramid having an angle R of 90 degrees. - Ultrasonic welding is performed by applying ultrasonic waves in a state in which the horn tips are located in the
depressed parts 214 of the respectivemicro protrusions 210. Consequently, it is possible to minimize wear of the electrode tab even in a case in whichhorn tips 320, the height of each of which is low, are used. - Such ultrasonic welding may be performed with respect to an anode tab, which is made of an aluminum material, in the same manner.
- Although the preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (12)
1. A jelly roll for a secondary battery configured by winding a cathode sheet, a separator, and an anode sheet, wherein electrode tabs are connected to uncoated portions of the electrode sheets, to which electrode active materials are not applied, by welding, and each of the electrode tabs is configured to have an embossed structure protruding toward the uncoated portion to improve weldability.
2. The jelly roll according to claim 1 , wherein the electrode tabs are made of aluminum or nickel.
3. The jelly roll according to claim 1 , wherein the embossed structure comprises a plurality of micro protrusions configured to have a structure having protruding parts formed at one side thereof facing the uncoated portion and depressed parts formed at the other side thereof so as to correspond to the protrusions.
4. The jelly roll according to claim 3 , wherein each of the micro protrusions has a protruding height of 50 to 500 microns.
5. The jelly roll according to claim 3 , wherein each of the micro protrusions has a protruding height of 100 to 150 microns.
6. The jelly roll according to claim 1 , wherein the electrode tabs are connected to the uncoated portions by ultrasonic welding.
7. The jelly roll according to claim 6 , wherein the ultrasonic welding is performed by a welding device comprising horn tips arranged at intervals corresponding to the micro protrusions of the embossed structure.
8. The jelly roll according to claim 7 , wherein the ultrasonic welding is performed by applying ultrasonic waves in a state in which the horn tips are located in the depressed parts of the respective micro protrusions.
9. A method of manufacturing a jelly roll according to claim 1 , the method comprising:
(a) winding a cathode sheet and an anode sheet in a state in which a separator is disposed between the cathode sheet and the anode sheet;
(b) positioning electrode tabs each having an embossed structure formed at a surface thereof on uncoated portions of the cathode sheet and the anode sheet so that protruding parts of the embossed structure face a corresponding one of the uncoated portions; and
(c) positioning horn tips of a welding device in depressed parts of the embossed structure of each of the electrode tabs and applying ultrasonic waves to the depressed parts.
10. A battery cell comprising a jelly roll according to claim 1 , wherein the jelly roll is mounted in a battery case.
11. The battery cell according to claim 10 , wherein the battery cell is a cylindrical battery or a prismatic battery.
12. A battery module comprising a plurality of battery cells according to claim 11 as unit cells.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/188,609 US10079380B2 (en) | 2011-08-12 | 2016-06-21 | Jelly-roll of improved productivity and battery cell comprising the same |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020110080477A KR101381674B1 (en) | 2011-08-12 | 2011-08-12 | Jelly-Roll of Improved Productivity and Battery Cell Comprising the Same |
KR10-2011-0080477 | 2011-08-12 | ||
PCT/KR2012/006076 WO2013024984A2 (en) | 2011-08-12 | 2012-07-31 | Jelly-roll with improved processability and battery cell including same |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/KR2012/006076 Continuation WO2013024984A2 (en) | 2011-08-12 | 2012-07-31 | Jelly-roll with improved processability and battery cell including same |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/188,609 Continuation US10079380B2 (en) | 2011-08-12 | 2016-06-21 | Jelly-roll of improved productivity and battery cell comprising the same |
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US20140147716A1 true US20140147716A1 (en) | 2014-05-29 |
Family
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US14/170,979 Abandoned US20140147716A1 (en) | 2011-08-12 | 2014-02-03 | Jelly-roll of improved productivity and battery cell comprising the same |
US15/188,609 Active 2032-09-22 US10079380B2 (en) | 2011-08-12 | 2016-06-21 | Jelly-roll of improved productivity and battery cell comprising the same |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US15/188,609 Active 2032-09-22 US10079380B2 (en) | 2011-08-12 | 2016-06-21 | Jelly-roll of improved productivity and battery cell comprising the same |
Country Status (8)
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US (2) | US20140147716A1 (en) |
EP (1) | EP2733778B1 (en) |
JP (1) | JP5952402B2 (en) |
KR (1) | KR101381674B1 (en) |
CN (1) | CN103733411B (en) |
MY (1) | MY174934A (en) |
TW (1) | TWI459609B (en) |
WO (1) | WO2013024984A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
US10079380B2 (en) | 2018-09-18 |
WO2013024984A3 (en) | 2013-05-30 |
KR20130017817A (en) | 2013-02-20 |
US20160301060A1 (en) | 2016-10-13 |
CN103733411A (en) | 2014-04-16 |
JP5952402B2 (en) | 2016-07-13 |
EP2733778A4 (en) | 2014-07-09 |
MY174934A (en) | 2020-05-24 |
TWI459609B (en) | 2014-11-01 |
EP2733778B1 (en) | 2016-08-10 |
KR101381674B1 (en) | 2014-04-04 |
TW201320437A (en) | 2013-05-16 |
JP2014529165A (en) | 2014-10-30 |
WO2013024984A2 (en) | 2013-02-21 |
EP2733778A2 (en) | 2014-05-21 |
CN103733411B (en) | 2017-06-23 |
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