Winding structure for lithium ion battery and manufacturing process thereof

A technology of lithium-ion battery and preparation process, which is applied in the field of lithium-ion battery winding structure and its preparation process, to achieve uniform stress, improve production efficiency, and eliminate stress

Active Publication Date: 2012-01-25
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a winding core for a lithium-ion secondary battery, which can improve the deformation and safety problems of the winding soft-package battery core, especially the thick battery core

Method used

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  • Winding structure for lithium ion battery and manufacturing process thereof
  • Winding structure for lithium ion battery and manufacturing process thereof
  • Winding structure for lithium ion battery and manufacturing process thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0027] A battery cell structure of a soft-packaged lithium-ion secondary battery, the battery cell is composed of a positive pole piece 4, a negative pole piece 3, a separator 6, and a winding core 5. An aluminum tab 2 is welded on the positive pole piece 4, and the negative pole piece The pole piece 3 is welded with a nickel lug 1, and the inner ring of the isolation film 6 is provided with a winding core 5, the winding core 5 is made of polymer PVDF, a track-shaped winding core, a monomer structure, and a thickness of 0.5 mm. The fillet at both ends is 0.25mm, see figure 1 , the length B of the winding core is the width 79mm of the positive pole piece 4, and the width A of the winding core is 32mm, see figure 2 , the present embodiment takes the semi-automatic winding type flexible packaging lithium-ion battery 904589 (thickness 9.0mm, width 45.0mm, length 89.0mm) as an example. Such as figure 1 As shown, it is completed according to the following steps: a. Wind the posit...

Embodiment 2

[0029] A battery cell structure of a soft-packaged lithium-ion secondary battery, the battery cell is composed of a positive pole piece 4, a negative pole piece 3, a separator 6, and a winding core 5. An aluminum tab 2 is welded on the positive pole piece 4, and the negative pole piece The pole piece 3 is welded with a nickel lug 1, and the inner ring of the isolation film 6 is provided with a winding core 5, the winding core 5 is made of polymer PEO, a track-shaped winding core, a monomer structure, and a thickness of 0.5mm. The fillet at both ends is 0.25mm, see figure 1 , the length B of the winding core is the width 79mm of the positive pole piece 4, and the width A of the winding core is 32mm, see figure 2 , the present embodiment takes the semi-automatic winding type flexible packaging lithium-ion battery 904589 (thickness 9.0mm, width 45.0mm, length 89.0mm) as an example. Complete according to the following steps: a. Wind the positive pole piece 4, the negative pole p...

Embodiment 3

[0031] A battery cell structure of a soft-packaged lithium-ion secondary battery, the battery cell is composed of a positive pole piece 4, a negative pole piece 3, a separator 6, and a winding core 5. An aluminum tab 2 is welded on the positive pole piece 4, and the negative pole piece The pole piece 3 is welded with a nickel lug 1, and the inner ring of the isolation film 6 is provided with a winding core 5, the winding core 5 is made of polymer PMMA, a track-shaped winding core, a monomer structure, and a thickness of 0.5mm. The fillet at both ends is 0.25mm, see figure 1 , the length B of the winding core is the width 79mm of the positive pole piece 4, and the width A of the winding core is 32mm, see figure 2 , the present embodiment takes the semi-automatic winding type flexible packaging lithium-ion battery 904589 (thickness 9.0mm, width 45.0mm, length 89.0mm) as an example. Complete according to the following steps: a. Wind the positive pole piece 4, the negative pole ...

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Abstract

The invention relates to a flexibly packaged lithium ion secondary battery, and particularly relates to a winding structure for a lithium ion battery. A battery cell is formed by winding an anode piece, a cathode piece and an isolation film, wherein an aluminum pole lug is welded on an inner ring of the anode piece; a nickel pole lug is welded on an inner ring of the cathode piece; and a winding core is arranged on the inner ring of the isolation film, thereby solving the deformation and safety problems of the flexibly packaged lithium ion battery; and the winding core is made from polymers, can be dissolved in an electrolyte after having a swelling action with the electrolyte but cannot influence the property of the battery cell. The invention also provides a manufacturing process for the winding structure for the lithium ion battery.

Description

technical field [0001] The invention relates to a soft-packaged lithium-ion secondary battery, in particular to a winding structure of the lithium-ion battery and a preparation process thereof. Background technique [0002] Lithium-ion batteries are currently the most advanced commercial secondary batteries in the world. With the development of various electronic products, the demand for lithium-ion batteries is showing a rapid growth trend. Lithium-ion battery cell winding is one of the key links in the production of lithium-ion batteries. During the winding process, the winding core is a very critical tool. The shape of the winding core will directly affect the flatness of the finished cell, especially for Thick batteries are prone to deformation; there are two reasons for the deformation: one is that the conventional winding core is composed of upper and lower winding needles. After winding, one of the winding needles needs to be removed to remove the battery core. In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 陶涛
Owner DONGGUAN AMPEREX TECH
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