Method for winding battery cell of lithium ion

A lithium-ion battery technology, applied in the winding field of lithium-ion batteries

Inactive Publication Date: 2011-08-17
SHENZHEN YINGHE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a winding method for lithium-ion batteries, which overcomes the technical problem of deformation of the batteries caused by the internal stress of the batteries.

Method used

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  • Method for winding battery cell of lithium ion
  • Method for winding battery cell of lithium ion
  • Method for winding battery cell of lithium ion

Examples

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Effect test

Embodiment 1

[0020] Such as figure 2 As shown, the winding method of the lithium ion battery core of the present embodiment, its specific operation process includes:

[0021] Manually fold the cut pole piece 2 and diaphragm 1 in sequence, and wind the starting end on the main winding needle 4, and the main winding needle driving mechanism drives the main winding needle 4 to rotate, driving the pole piece that has been positioned at the starting end. After the sheet 2 and the diaphragm 1 are wound to a predetermined thickness, the predetermined thickness is preferably 4 to 5 mm; the driving mechanism is stopped, and an auxiliary winding needle 3 is manually positioned in parallel with the main winding needle 4 on the pole piece of the predetermined thickness shown On the surface, the driving mechanism works to drive the main winding needle 4 to continue to rotate. After winding one circle, release the auxiliary winding needle while continuing to wind, and continue to wind the predetermined...

Embodiment 2

[0024] The lithium-ion battery winding method in Example 1 adopts a semi-manual method, and some operations need to be manually completed by human operators, and the winding efficiency is low. The cell winding method of the present invention is also suitable for use on automatic winding equipment, and its specific implementation steps are as follows:

[0025] Install the coils of the pole piece and the diaphragm on the automatic unwinding mechanism respectively, and wind the starting ends of the diaphragm and the pole piece on the main winding needle of the automatic winding equipment, and the diaphragm and the pole piece are automatically unwound by the automatic unwinding mechanism. Unwind, automatically enter the winding section, the main winding needle is located in the winding section, the driving mechanism drives the main winding needle to rotate, drives the pole piece and diaphragm positioned at the starting end to wind to a predetermined thickness, the driving mechanism...

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Abstract

The invention discloses a method for winding a battery cell of a lithium ion, which comprising the following steps: 1) winding an electrode piece and a membrane to a predetermined thickness; 2) locating an auxiliary winding needle on the surface of the product obtained in the first step; 3) sequentially winding until reaching to a predetermined number of turns; and 4) repeating the second step and the third step until reaching the battery cell to a predetermined size. The method for winding a battery cell of a lithium ion provided by the invention has the advantages that the membrane of a battery cell product has a certain of distortion allowance, and the battery cell can be prevented from deforming caused by the concentration of the membrane.

Description

technical field [0001] The invention relates to a winding method of a lithium-ion electric core, in particular to a winding method for preventing deformation of the electric core during a subsequent process. Background technique [0002] Such as figure 1 As shown, the current production method of winding lithium-ion cells is to wind the anode sheet, cathode sheet, and separator at intervals while the separator maintains tension. When the tension is kept stable, there will inevitably be a certain extension and deformation. The greater the tension, the more serious the extension will be; the extension of the diaphragm will cause a certain internal stress inside the battery. When the battery is baked at high temperature or undergoes charge and discharge cycles, the battery will The internal stress stored in the core will be gradually released, causing the isolation film to shrink in the length direction. Since the positive and negative pole pieces cannot shrink, and the neces...

Claims

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Application Information

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IPC IPC(8): H01M10/0587
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 李红竞王胜玲王维东
Owner SHENZHEN YINGHE TECH
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