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Cylindrical lithium rechargeable battery and method for fabricating the same

A cylindrical, recharging technology, which is applied in the manufacture of electrolyte batteries, cylindrical shell batteries/batteries, secondary batteries, etc., can solve problems such as sparks, uneven welding strength, and impurities

Inactive Publication Date: 2006-02-22
SAMSUNG SDI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] If the cathode tabs are connected to the lower end of the cylindrical case by resistance welding, the electrodes must be replaced frequently, which increases the manufacturing time of rechargeable batteries when producing large quantities of rechargeable batteries
In addition, in resistance welding, welding energy is gradually transferred from the welding surface to the surrounding parts of the object to be welded, so the weld strength of the welded joint may be uneven
In addition, impurities or sparks may be generated during resistance welding, which may damage the electrode assembly

Method used

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  • Cylindrical lithium rechargeable battery and method for fabricating the same
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  • Cylindrical lithium rechargeable battery and method for fabricating the same

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Embodiment Construction

[0024] The invention discloses a cylindrical lithium rechargeable battery and a manufacturing method thereof. In this battery, the anode tab of the electrode assembly is connected to the cylindrical case by laser welding instead of resistance welding, thereby reducing the amount of impurities and preventing the electrode assembly from being damaged by possible sparks during the resistance welding process. In addition, this provides uniform weld strength between the anode tab and the cylindrical casing.

[0025] Figure 1a is a perspective view of a cylindrical lithium rechargeable battery 100 according to an exemplary embodiment of the present invention, Figure 1b for along Figure 1a Cross-sectional view of line "1a-1a" shown.

[0026] Such as Figure 1a and 1b As shown, the cylindrical lithium rechargeable battery 100 includes: an electrode assembly 200 generating voltage during charging and discharging, a cylindrical case 300 for accommodating the electrode assembly 200 ...

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Abstract

A cylindrical lithium rechargeable battery has an anode tab that is welded to a lower surface of a cylindrical case through laser welding. The cylindrical lithium rechargeable battery includes a cylindrical electrode assembly formed at a center portion thereof with a space section and including a cathode plate, an anode plate, a separator interposed between the cathode plate and the anode plate, a cathode tab that is coupled with an end of the cathode plate, and an anode tab that is coupled with an end of the anode plate. The battery also comprises a cylindrical case including a cylindrical sidewall that forms a space to receive the cylindrical electrode assembly therein and a lower wall that is provided at a bottom of the cylindrical sidewall and a cap assembly that is coupled with an upper portion of the cylindrical case and has a terminal section that is coupled with the cylindrical electrode assembly. In addition, a center pin is installed in the space section of the cylindrical electrode assembly, wherein the anode tab is coupled with an inner center portion of the lower wall of the cylindrical case by laser welding.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefits from Korean Patent Application No. 2004-0048304, filed June 25, 2004, which is incorporated herein for reference purposes. technical field [0003] The invention relates to a cylindrical lithium secondary battery and a manufacturing method thereof. Specifically, the present invention relates to a cylindrical lithium secondary battery and a method of manufacturing the same, wherein an anode tab is welded to the lower surface of the cylindrical case by laser welding. Background technique [0004] Recently, various light-weight and small-sized portable electronic devices, such as mobile phones, notebook computers, and camcorders, have been well developed and manufactured. These devices are equipped with a battery pack which may include at least one rechargeable battery capable of outputting a predetermined voltage to drive the portable electronic device for a certain period o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/38H01M10/04H01M50/119H01M50/124H01M50/145H01M50/538
CPCH01M10/052H01M10/0587H01M10/058H01M2/022Y10T29/49114Y10T29/4911H01M2/0287H01M2/266Y02E60/122H01M2/0275H01M2/0285Y02E60/10H01M50/107H01M50/124Y02P70/50H01M50/145H01M50/538H01M50/119H01M50/536H01M10/0422H01M10/0431
Inventor 金钟九斎藤晶彦
Owner SAMSUNG SDI CO LTD
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