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Folded and assembled battery and preparation method thereof

An assembled battery technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of battery cell reaction degree, uneven rate, unsuitable for the promotion of large-capacity batteries, and uneven internal structure of the winding core. Achieve the effect of uniform structure, high production efficiency and easy control of thickness

Inactive Publication Date: 2012-10-03
东莞市金源电池科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the internal structure of the winding core body of the wound lithium-ion battery is not uniform, and the internal reaction degree and rate of the battery core are uneven during charging and discharging, and it is easy to deform, so it is not suitable for promotion in large-capacity batteries.

Method used

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  • Folded and assembled battery and preparation method thereof
  • Folded and assembled battery and preparation method thereof
  • Folded and assembled battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as Figure 1~4 As shown, a folded sheet assembled battery includes a winding core body 1, an aluminum-plastic film for wrapping the winding core body 1 and an electrolyte injected into the aluminum-plastic film, and the winding core body 1 includes a positive electrode sheet 2 , a negative electrode sheet 3 and a separator 4, the separator 4 covers the positive electrode sheet 2 after being folded in half, and the positive electrode sheet 2 and the negative electrode sheet 3 are folded and assembled. Specifically, the separator 4 is folded in half laterally to cover the positive electrode sheet 2, which is easy to operate.

[0032] The positive electrode sheet 2 and the negative electrode sheet 3 described in this embodiment are folded and assembled alternately in sequence. When folding and assembling, the positive electrode sheet 2 is folded in the direction of the negative electrode sheet 3, and then the negative electrode sheet 3 is folded in the direction of th...

Embodiment 2

[0037] The difference between this embodiment and Embodiment 1 lies in that there are two or more folding layer groups in this embodiment. The winding core body 1 of this embodiment is thicker and has a larger capacity, and can be made into an ultra-thick battery.

[0038] Features that are not explained in this embodiment are explained in Embodiment 1, and will not be repeated here.

preparation Embodiment 1

[0040] A method for preparing the folded sheet assembled battery of Example 1, comprising the following preparation steps:

[0041] (a) After the diaphragm 4 is folded in half, the positive electrode sheet 2 is placed in the space formed by the diaphragm 4 folded in half, and the diaphragm 4 covers the positive electrode sheet 2;

[0042] (b) placing the negative electrode sheet 3 on the surface of the separator 4 so that the negative electrode sheet 3 is perpendicular to the positive electrode sheet 2;

[0043] (c) The positive electrode sheet 2 and the negative electrode sheet 3 are folded and assembled to obtain the roll core body 1;

[0044] (d) Wrap the roll core body 1 with an aluminum-plastic film, and inject electrolyte into the aluminum-plastic film to obtain a folded sheet assembled battery.

[0045] The folding assembly is specifically: the positive electrode sheet 2 is folded in half along the negative electrode sheet 3 , and then the negative electrode sheet 3 is...

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Abstract

The invention relates to the technical field of a lithium ion battery, and particularly relates to a folded and assembled battery and a preparation method thereof. The folded and assembled battery comprises a roll core body, an aluminum-plastic film for coating the roll core body and electrolyte injected into the aluminum-plastic film, wherein the roll core body comprises a positive plate, a negative plate and a diaphragm; and the diaphragm coats the positive plate after being folded, and the positive plate and the negative plate are folded and assembled. The structure of the roll core body of the folded and assembled battery is uniform and consistent in structure, not easy to deform, easy to control in thickness, stable in quality and suitable for generalization in a large-capacity battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a sheet-assembled battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, long cycle life, and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras and laptop computers, but also widely used in electric vehicles and electric bicycles. As well as large and medium-sized electric equipment such as electric tools, with the gradual increase in the application range, the performance requirements for lithium-ion batteries are getting higher and higher. [0003] The traditional liquid flexible packaging lithium-ion battery processing methods include stacked and wound types. Large-capacity batteries are generally assembled by stacking or winding, and multiple winding cores are connected in parallel. The internal s...

Claims

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Application Information

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IPC IPC(8): H01M10/0585
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 李志福吴治国邢伟伟陈设军
Owner 东莞市金源电池科技有限公司
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