Lithium ion battery and cell thereof

A lithium-ion and battery technology, applied in the field of cylindrical lithium-ion batteries and their batteries, can solve problems such as safety accidents, no voltage output of batteries, and inability to discharge, so as to reduce strain and ensure voltage and current output , The effect of reducing internal resistance

Inactive Publication Date: 2010-07-28
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the breakage of the pole piece, the battery cell of the lithium-ion battery will have no voltage output, cannot be discharged, and even a safety accident will occur.

Method used

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  • Lithium ion battery and cell thereof
  • Lithium ion battery and cell thereof
  • Lithium ion battery and cell thereof

Examples

Experimental program
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Effect test

Embodiment Construction

[0026] In order to solve the problem of the breakage of the pole piece, it is first necessary to analyze the reason for the breakage of the negative pole piece 20 .

[0027] When charging a lithium-ion battery, its negative electrode sheet 20 will expand. At this time, the negative electrode sheet 20 of the cylindrical cell will rotate to increase the diameter of the cell, and the negative electrode sheet 20 will naturally straighten to reduce tension and pressure. , to avoid breakage. It is measured that when charging from 3.0V to 4.2V, the expansion rate of the negative electrode sheet 20 is about 0.6%, and the diameter of the bare cell increases from 17.35 mm to 17.45 mm.

[0028] see Figure 3 to Figure 4 , according to Young's modulus (Young's modulus) theory, the copper foil 22 and the negative electrode diaphragm 24, 25 are composed of a rigid body A1, so the expansion force can be transmitted well, so that the pole piece can be straightened to avoid breakage. However...

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Abstract

The invention discloses a cell of a lithium ion battery, which comprises a negative pole piece and a positive pole piece which are mutually overlaid and wound into a cylinder shape, and an isolation membrane between the negative pole piece and the positive pole piece, wherein the negative pole piece comprises a copper foil serving as a negative pole collector, and negative pole membranes coated on two surfaces of the copper foil; and the negative pole piece is also provided with a negative pole lead-out end which is fixed on the copper foil at the tail ends of the negative pole membranes and is pasted with a tape. By changing the position of the negative pole lead-out end to reduce the strain of an easily broken part of the copper foil, the grain boundary of the copper foil cannot be damaged in the charging process, lithium cannot insert into the grain boundary of the copper foil, and the copper foil cannot be broken neither; therefore, the internal resistance of the battery is greatly reduced when the battery is discharged, and the output of the voltage and current is ensured. The invention also discloses a lithium ion battery, which comprises the cell of the lithium ion battery, a steel shell covering the cell and electrolyte rushing into the steel shell.

Description

technical field [0001] The invention relates to a lithium ion battery and its battery core, in particular to a cylindrical lithium ion battery and its battery core which are not prone to breakage of pole pieces during charging. Background technique [0002] With the development of modern society, various mobile devices, such as video cameras, notebook computers, portable DVDs, digital cameras, etc., have become more and more widely used, thus forming an increasing demand for high-energy batteries. Since cylindrical batteries have the highest energy density, and lithium-ion batteries have many outstanding advantages such as light weight, large energy storage, high power, no pollution, long life, small self-discharge coefficient, and wide temperature range, the cylindrical lithium-ion Batteries are gradually gaining popularity as the best power source for mobile devices. [0003] see figure 1 with figure 2 , is a schematic diagram of the design structure of the positive an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M4/02H01M10/36H01M10/40H01M2/02H01M50/107H01M50/119
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 邓尧平黄院军李新宏张介威陈卫周俊于瑜李娟娟
Owner DONGGUAN AMPEREX TECH
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