Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Lithium ion battery diaphragm and production thereof

A technology for battery diaphragms and diaphragms, which is applied to battery pack parts, circuits, electrical components, etc. It can solve problems such as difficult hole shape and precise adjustment of porosity, and achieve uniform strength, high puncture resistance, and high production efficiency.

Inactive Publication Date: 2008-05-14
XINXIANG ZHONGKE SCI&TECH
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is difficult to precisely adjust the hole type and porosity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add 0.01% by weight of poly-1-butene as a pore modifier and 0.01% by weight of N-methylolacrylamide as a porosity regulator into polypropylene resin, and melt at a temperature of 100 to 260°C Extrusion granulation into pellets;

[0020] (2) Melt and extrude the above-mentioned pellets at 100-260° C., and cool the extruded flat film with a cooling roll. The cooling temperature is -20-150° C. and the cooling time is 0.1-10 minutes. When other conditions are constant, the higher the elastic modulus of the original flat film, the more conducive to the formation of micropores, and the cooling temperature and time can affect the elastic modulus;

[0021] (3) The above-mentioned extruded flat film is subjected to a continuous process of first longitudinal stretching and then transverse stretching, the stretching temperature is -20-220° C., and finally heat-set at 0-200° C. for 0.1-30 minutes.

Embodiment 2

[0023] (1) Add 0.1% by weight of poly-1-butene as a pore modifier and 0.1% by weight of N-methylolacrylamide as a porosity regulator into polypropylene resin, and melt at a temperature of 100 to 260°C Extrusion granulation into pellets;

[0024] (2) Melt and extrude the above pellets at 100-260°C, and cool the extruded flat film with a cooling roll, the cooling temperature is -20-150°C, and the cooling time is 0.1-10 minutes;

[0025] (3) The above-mentioned extruded flat film is subjected to a continuous process of first longitudinal stretching and then transverse stretching, the stretching temperature is -20-220° C., and finally heat-set at 0-200° C. for 0.1-30 minutes.

[0026] Head Example 3:

[0027] (1) Add 1% by weight of poly-1-butene as a pore modifier and 1% by weight of N-methylolacrylamide as a porosity regulator into polypropylene resin, and melt at a temperature of 100 to 260°C Extrusion granulation into pellets;

[0028] (2) Melt and extrude the above pellets...

Embodiment 4

[0031] (1) Add 0.5% by weight of polyvinylidene fluoride as a pore modifier and 0.2% by weight of magnesium oxide as a porosity regulator into polypropylene resin, melt and extrude at a temperature of 100 to 260°C to form granules material;

[0032] (2) Melt and extrude the above pellets at 100-260°C, and cool the extruded flat film with a cooling roll, the cooling temperature is -20-150°C, and the cooling time is 0.1-10 minutes;

[0033] (3) The above-mentioned extruded flat film is subjected to a continuous process of first longitudinal stretching and then transverse stretching, the stretching temperature is -20-220° C., and finally heat-set at 0-200° C. for 0.1-30 minutes.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
porosityaaaaaaaaaa
Login to View More

Abstract

The said additive is a caliber modifier selected from low melting point or low softening point polymer, or an aperture modifier selected from amide, metal oxide, and carboxylate compound. The said polyolefin resin is an acrylic resin or a polyvinyl resin or mixture of the both. The method for manufacturing the diaphragm of Li-ion cell includes: 1) 0.001í½10 % by weight of additive is added into polyolefin resin, and the mixture is evenly blended at 100í½260íµ; 2) the evenly blended mixture is extruded in hot-melt state, and the flat film is cooled by using chiller; the cooling temperature is -20í½+150íµ for 0.1í½10 min.; 3) the longitudinal stretching is made of the said flat film, and then the lateral stretching is made for it; the stretching temperature is -20í½220íµ; finally, hot shape-fixing is made at -20í½220íµ for 0.1í½30 min.

Description

technical field [0001] The invention relates to a battery material, in particular to a self-closing diaphragm of a lithium ion battery. Background technique [0002] Lithium-ion batteries have become a new generation of batteries widely used due to their advantages of high voltage, high specific energy, long cycle life and no pollution to the environment. The separator, as a key component in lithium-ion batteries, plays the role of isolating the positive and negative electrodes, and because of its micropores, it can also play the role of ion conduction. At present, its production methods are solvent extraction method and cold stretching method. [0003] The principle of the solvent extraction method is: polyolefin, thermoplastic elastomer and solvent are used as raw materials, kneaded, melted, extruded, and rolled into a sheet, and the sheet is stretched once and cleaned with a diluent to remove most of the solvent. After the second stretching and the second cleaning, the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16C08J5/22H01M50/403H01M50/417
CPCY02E60/12Y02E60/10
Inventor 李长杰杨书廷徐亮王向东赵丽李述中
Owner XINXIANG ZHONGKE SCI&TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com