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Preparation method and system for power lithium ion battery diaphragm

A lithium-ion battery and subsystem technology, applied in battery pack components, circuits, electrical components, etc., can solve the problems of high production requirements, large equipment usage, and high equipment costs, saving energy consumption and reducing defective products. , the effect of improving the technical level

Inactive Publication Date: 2012-01-11
SHANGHAI QIANCHENG TOY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The object of the present invention is to provide a kind of preparation method of power lithium-ion battery diaphragm, to solve the equipment usage amount that produces lithium-ion battery diaphragm in the prior art, equipment cost is higher and the produced lithium-ion battery diaphragm defective occurrence rate , Defects with high production requirements

Method used

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  • Preparation method and system for power lithium ion battery diaphragm
  • Preparation method and system for power lithium ion battery diaphragm
  • Preparation method and system for power lithium ion battery diaphragm

Examples

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preparation example Construction

[0058] The invention provides a preparation method of a power lithium-ion battery separator, comprising the following steps:

[0059]1. Add ultra-high molecular weight polyethylene, antioxidant and mineral oil in a certain proportion into the mixer to fully mix the raw materials;

[0060] 2. The mixture stirred in step 1 is divided into the first processing line and the second processing line to be processed separately at the same time;

[0061] Processing of the mixture entering the first processing line:

[0062] (1) The mixture entering the first processing line is put into a twin-screw extruder for heating and continuous extrusion to form a substrate;

[0063] (2) The substrate extruded from the twin-screw extruder is cooled and formed by a set of cooling rollers;

[0064] (3) The cooled and formed substrate is simultaneously stretched in both transverse and longitudinal directions by a biaxial stretching device, so that the substrate is stretched into a diaphragm;

[0...

Embodiment 1

[0080] Embodiment 1, the steps of a lithium ion battery separator preparation method in this embodiment are as follows:

[0081] 1. Add ultra-high molecular weight polyethylene, antioxidant and mineral oil in a certain proportion into the mixer to fully stir the raw materials, wherein the mass ratio of mineral oil and antioxidant is 1000~2000:1, mineral oil and The mass ratio of UHMWPE is 2~10:1.

[0082] The molecular weight of the ultra-high molecular weight polyethylene in this embodiment is 1 million or more.

[0083] 2. The mixture stirred in step 1 is divided into the first processing line and the second processing line to be processed separately at the same time.

[0084] 3. Processing of the mixture entering the first processing line:

[0085] (1) The mixture entering the first processing line is put into a twin-screw extruder for heating and continuous extrusion to form a substrate.

[0086] The screw diameter of the twin-screw extruder here is 10-150 mm, and its e...

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Abstract

The invention brings forward a preparation method and system for a power lithium ion battery diaphragm. According to the method, firstly, raw materials are put into a mixer for complete stirring; secondly, stirred mixture is allowed to enter into two same processing lines after shunting for simultaneous processing, wherein, the processing line comprises the following procedures: 1, heating the mixture and extruding out substrates, 2, cooling the substrates to allow molding of the substrates, 3, carrying out simultaneous transverse and longitudinal bidirectional drawing on the molded substrates with bidirectional drawing equipment so as to enable the substrates to become diaphragms under drawing, 4, extracting mineral oil from the diaphragms through an extraction tank by using alkanes as an extractant, 5, fixing, drawing and rectifying the diaphragms after extraction with transverse drawing equipment and ensuring volatilization of residual extracting solution on the diaphragms, and 6, carrying out heat treatment on the diaphragms; thirdly, the finished products of diaphragms are curled, cut and packaged. The invention enables the defects in the prior art that utilization amount of equipment for production of battery diaphragms is great, that cost for the equipment is high and that the incidence rate of substandard products of and production requirements for lithium ion battery diaphragms are high to be overcome.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of a power lithium-ion battery separator. Background technique [0002] Rechargeable lithium-ion secondary batteries have the characteristics of high specific energy, long cycle life, no memory effect, and also have the advantages of safety, reliability and rapid charge and discharge, so they have become a hot spot in the research of new power technology in recent years. Since lithium-ion batteries are environmentally friendly and pollution-free secondary batteries, they meet the great development needs of energy and environmental protection in today's countries, and their usage in all walks of life is increasing rapidly. At present, secondary lithium-ion batteries are widely used in digital electronic products such as mobile phones, notebook computers, and MP3s, which are widely used in daily life. In recent years, they have also been used in some high-power batteries...

Claims

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Application Information

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IPC IPC(8): H01M2/14
CPCY02E60/10
Inventor 屠兆辉
Owner SHANGHAI QIANCHENG TOY TECH