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Preparation method for battery diaphragm

A technology of battery diaphragm and diaphragm, which is applied in the direction of battery pack parts, circuits, electrical components, etc., can solve the problems of lithium-ion battery diaphragm defective occurrence rate, production requirements and high cost, so as to save cost, reduce requirements and improve pull The effect of elongation speed

Inactive Publication Date: 2012-07-11
屠兆辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to provide a method for preparing a battery separator to solve the defects of lithium-ion battery separators produced in the prior art, such as the occurrence rate of defective products, production requirements and high cost.

Method used

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  • Preparation method for battery diaphragm
  • Preparation method for battery diaphragm
  • Preparation method for battery diaphragm

Examples

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Embodiment 1

[0036] Embodiment 1, a battery diaphragm in this embodiment, especially a lithium-ion battery diaphragm preparation method, the steps are as follows:

[0037] 1. Add ultra-high molecular weight polyethylene, antioxidant and mineral oil into the mixer in a certain proportion to fully stir the raw materials. Among them, the mass ratio of mineral oil to antioxidant is 1000-2000:1, mineral oil and The mass ratio of ultra-high molecular weight polyethylene is 2-10:1.

[0038] The ultrahigh molecular weight polyethylene in this example has a molecular weight of 1 million or more.

[0039] 2. Put the mixture stirred in step 1 into a twin-screw extruder to heat and extrude continuously to form a substrate.

[0040] Here, the diameter of the screw of the twin-screw extruder is 10-150 millimeters, and its extrusion capacity is greater than 200 kilograms per hour.

[0041] 3. The substrate extruded from the twin-screw extruder is cooled and formed by a set of cooling rollers;

[0042]...

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Abstract

The invention provides a preparation method for a battery diaphragm. The preparation method for the battery diaphragm comprises the following steps in order: stirring, extruding, cooling and shaping, dual-direction stretching, extracting, transversely stretching and heat treating. A 6-micrometer ultra-thin battery diaphragm is prepared by the preparation method of the invention and has the advantages of high stability and long service life.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of a power lithium-ion battery diaphragm. Background technique [0002] Rechargeable lithium-ion secondary battery has the characteristics of high specific energy, long cycle life, no memory effect, and has the advantages of safety, reliability and fast charge and discharge, so it has become a hot spot in the research of new power supply technology in recent years. Since lithium-ion batteries are green, environmentally friendly and non-polluting secondary batteries, they meet the major development needs of energy and environmental protection in various countries today, and their usage in all walks of life is increasing rapidly. At present, secondary lithium-ion batteries are not only widely used in digital electronic products such as mobile phones, notebook computers, and MP3, but also in some high-power batteries such as electric vehicles and electric bicycles in rece...

Claims

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Application Information

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IPC IPC(8): H01M2/14
CPCY02E60/12Y02E60/10
Inventor 屠兆辉
Owner 屠兆辉
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