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Preparation method for ultrafine cylindrical flexible package lithium ion battery

A lithium-ion battery and flexible packaging technology, applied in electrode manufacturing, secondary batteries, circuits, etc., can solve the problems of troublesome manufacturing process and increasing demand, and achieve the effect of improving product quality and reducing the diameter of finished products

Inactive Publication Date: 2015-08-26
FENGHUA YUCHUANG PROD DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] These ordinary lithium-ion batteries are relatively simple to manufacture. With the development of electronic cigarettes, the production process of small-diameter lithium-ion batteries required on the market is relatively troublesome. There are more and more demands for such small-diameter lithium-ion batteries. Mainly used in products such as electronic cigarettes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] This specific embodiment adopts the following technical scheme: a preparation method of an ultra-fine cylindrical soft-pack lithium-ion battery, the steps of which are as follows:

[0016] (1) Mix positive electrode active material (lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium manganate, lithium iron phosphate), binder, conductive agent and solvent evenly, coat on the surface of current collector aluminum foil, dry, roll Pressing, slitting, and producing the positive electrode sheet;

[0017] (2) After uniformly mixing the negative electrode active material (graphite), the binder, the conductive agent and the solvent, apply it on the surface of the current collector copper foil, dry, roll, cut, and obtain the negative electrode sheet after sheeting;

[0018] (3) Winding the positive electrode sheet, the negative electrode sheet, and the polyolefin diaphragm into a core;

[0019] (4) Put the winding core into the flexible packaging film, dry, inj...

Embodiment 1

[0022] 1. Mix positive active material (lithium cobalt oxide, lithium nickel cobalt manganate, lithium manganate, lithium iron phosphate), binder, conductive agent and solvent evenly, and spread the gap coating on the surface of the current collector aluminum foil, the coating step length is 115mm , where the lengths of the empty foil areas coated on both sides are 60mm and 75mm respectively. After drying, rolling, and cutting, they enter the sheet production. During the sheet production, the positive electrode sheet is cut into a total length of 70mm. Foil zone lengths are 10mm and 22mm;

[0023] 2. Mix the negative electrode active material (graphite), binder, conductive agent and solvent evenly, and spread the gap coating on the surface of the aluminum foil of the current collector. The length of the coating step is 115mm, and the lengths of the empty foil areas coated on both sides are 60mm and 65mm respectively. After drying, rolling, and slitting, it enters into sheet pr...

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PUM

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Abstract

The invention discloses a preparation method for an ultrafine cylindrical flexible package lithium ion battery, relating to the preparation method for lithium ion batteries. The preparation method comprises a first step of uniformly mixing positive active materials (lithium cobalt oxide, lithium nickel manganese cobalt oxide, lithium manganate oxide, lithium iron phosphate), a binder, a conductive agent and a solvent, coating the surface of a current collector aluminum foil with the mixture, and drying, rolling, cutting and flaking the coated current collector aluminum foil to obtain a positive plate; a second step of uniformly mixing negative active material (graphite), a binder, a conductive agent and a solvent, then coating the surface of a current collector copper foil with the mixture, and drying, rolling, cutting and flaking the coated current collector copper foil to obtain a negative plate; a third step of coiling the positive plate, the negative plate and a polyolefin diaphragm into a core; and a fourth step of putting the core in a flexible package diaphragm, drying, and carrying out liquid injection, sealing, forming and shaping to obtain the ultrafine cylindrical flexible package lithium ion battery. According to the battery assembly technology, a thin coiling needle with strong tenacity is used, so that the diameter of a prepared battery is reduced; and the battery preparation method adopts automatic production, so that the quality, efficiency and percent of pass of the battery are improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery, in particular to a preparation method of an ultra-fine cylindrical flexible-packaged lithium-ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high nominal voltage, high specific energy, long cycle life, no memory effect, etc., and are environmentally friendly and pollution-free, so they are widely used in digital products such as mobile phones, notebook computers, and MP3 players. [0003] These ordinary lithium-ion batteries are relatively simple to manufacture. With the development of electronic cigarettes, the production process of small-diameter lithium-ion batteries required on the market is relatively troublesome. There are more and more demands for such small-diameter lithium-ion batteries. It is mainly used in products such as electronic cigarettes. Contents of the invention [0004] In view of the deficiencies in the prior art...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587
CPCH01M4/0404H01M10/0587Y02E60/10Y02P70/50
Inventor 卓朝旦
Owner FENGHUA YUCHUANG PROD DESIGN