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Jelly-roll type electrode assembly and secondary battery employing the same

An electrode assembly and cementing technology, which is applied in the field of cemented electrode assemblies, can solve the problems of damage to the first and second separators, easy deformation, short circuit between the negative electrode plate 21 and the positive electrode plate 22, etc.

Active Publication Date: 2009-02-04
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the negative electrode uncoated portion 21c is easily deformed, such as curled, at the beginning of winding.
The entanglement of the negative electrode uncoated portion 21c in a deformed state may cause damage to the first and second separators 25a and 25b facing both faces of the negative electrode uncoated portion 21c, causing the negative electrode plate 21 to separate from the A short circuit occurs between the positive electrode plates 22, or a dislocation of the negative electrode tab 23 attached to the negative electrode uncoated portion 21c is caused.

Method used

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  • Jelly-roll type electrode assembly and secondary battery employing the same
  • Jelly-roll type electrode assembly and secondary battery employing the same
  • Jelly-roll type electrode assembly and secondary battery employing the same

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Embodiment Construction

[0026] Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals are used to refer to like parts. The embodiments described below serve to explain the present invention by referring to the figures.

[0027] Figure 4 Shows the winding start parts of the negative electrode plate and the positive electrode plate of the electrode assembly according to one embodiment of the present invention, while Figure 5 shows the Figure 4 The winding process of the negative and positive electrode sheets being wound together with the separator is shown.

[0028] Referring to the drawing, the negative electrode plate 111 includes a negative electrode current collector 112 made of strip-shaped metal foil, such as copper foil. The negative electrode current collector 112 has a negative electrode coating portion 113 on which a negative electrode active material is formed. A mixture or compo...

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Abstract

A jelly-roll type electrode assembly having a negative electrode plate having a negative electrode coated portion coated with a negative electrode active material layer, and a negative electrode uncoated portion disposed at an end of the negative electrode plate that is near a center of the electrode assembly, a positive electrode plate having a positive electrode coated portion coated with a negative electrode active material layer, and a positive electrode uncoated portion disposed at an end of the positive electrode plate that is near the center of the electrode assembly, a separator between the negative electrode plate and the positive electrode plate, and a negative electrode tab and a positive electrode tab electrically connected to the negative electrode uncoated portion and the positive electrode uncoated portion, respectively, wherein a width of the negative electrode uncoated portion is approximately 2 to 3 times that of the negative electrode tab.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to Korean Patent Application No. 2003-33340 filed in the Korean Intellectual Property Office on May 26, 2003, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to a secondary battery, and more particularly to a bonded type electrode assembly having an improved structure for reducing deformation occurring during winding of a positive electrode, a negative electrode, and a separator, and the present invention also relates to It relates to a secondary battery using such an electrode assembly. Background technique [0004] Generally, secondary batteries can be recharged, unlike primary batteries, which cannot be recharged. Such secondary batteries are used in a wide variety of applications, including advanced portable electronic devices such as cellular phones (or mobile phones), notebook computers, and camcorders. In p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M10/04H01M10/40H01M2/26H01M6/10H01M10/0587
CPCH01M10/0431Y02E60/122H01M10/052H01M4/13H01M4/02H01M10/0587H01M2/263Y02E60/10Y02P70/50H01M10/0525
Inventor 吴东英吴正元
Owner SAMSUNG SDI CO LTD