High-barrier layer flexible packaging film for isolating contents of polymer lithium battery

A flexible packaging film, lithium battery technology, used in packaging, wrapping paper, transportation and packaging, etc., can solve the problems of short circuit of metal electrodes and high pressure, and achieve stable coating, wide heat sealing temperature, and ultra-high puncture resistance. Effect

Inactive Publication Date: 2012-01-25
刘继福
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When heat sealing, the heat sealing temperature is (160±15) ℃. The pressure is about 3x105Pa. The time is about 4s. The metal electrode is raised than other places, and the pressure is high. The high temperature softens the material, and the metal electrode is easily pressed to the aluminum layer in the middle of the composite film to cause a short circuit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] In the following examples, the base film constituting the high barrier layer can be on the following films: polypropylene (PP), chlorinated polypropylene or cast polypropylene (CPP), polyethylene (PE), polyethylene terephthalate Diol ester (PET), nylon (PA) or aromatic nylon (MXD6), MPE elastomer blend, polyvinylidene chloride (PVDC), ethylene-vinyl alcohol copolymer (EVOH), polyethylene naphthalate Glycol ester (PEN), any combination of two films in GT film, for example: PP and CPP, PP and PE, PET and CPP, PA and CPP, BOPP and MPE elastomer blends, PVDC and PEN, EVOH can be selected Combine with PA or MXD6, EVOH and PEN, GT and CPP, GT and sarin resin and other films to form a high barrier base film, or combine any three of the above films to form a base film. The base film of the copolymer film composed of the above two films or the combination of the three films can be coated with a high-barrier and water-resistant modified PVA coating film. The above-mentioned vari...

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PUM

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Abstract

The invention provides a high-barrier layer flexible packaging film for isolating contents of a polymer lithium battery. The high-barrier layer flexible packaging film comprises at least two kinds of films which are combined to form a layer of composite film, wherein the composite film comprises a basic layer, a functional layer and a heat sealing layer; the high-barrier layer flexible packaging film is characterized in that: the basic layer is a copolymer film prepared by combining at least two film base materials of PP (polypropylene), CPP (chlorinated polypropylene or casting polypropylene), PE (polyethylene), PET (poly(ethylene terephthalate)), PA (polyamide) or MXD6 (aromatic polyimide), MPE (elastomer blend), PVDC (polyvinyl dichloride), EVOH (ethylene-vinyl alcohol), PEN (polyethylene naphthalate) and GT, or by complexing pairwise; and a high-barrier water-tolerant modified PVA (poly vinyl alcohol) coating film is coated on the copolymer film base materials. The high-barrier layer flexible packaging film has excellent gas barrier property, remarkably low oxygen permeability, water resistance, corrosion resistance, good high temperature resistance and great barrier property, and resists organic solvents and highly-volatile substances. In the invention, the high-barrier PVA is preferably coated on various base materials to obtain a base layer serving as a high-barrier layer which has great barrier property and excellent performance in resisting gas, water, corrosion, ultraviolet rays and the like.

Description

technical field [0001] The invention relates to a high-barrier flexible packaging film mainly used for gas-blocking, water-blocking, oil-blocking and high-permeability-resistance type composite packaging, especially for blocking electrolyte solution, which is the content of a polymer lithium battery. Internationally, the oxygen transmission rate will be less than 3.8Cm 3 .mm / 24b.m 2 .MPa polymers are called barrier polymers. High barrier standard for high barrier packaging materials: O 2 Permeation rate is 5ml / m 2 , below d, moisture permeability is 2g / m 2 , below d. Background technique [0002] Usually used for flexible packaging to block the contents of polymer lithium batteries, if the adhesive layer is not included, it is mainly a multi-layer co-extruded composite film composed of an outer layer, a barrier layer (middle layer aluminum foil) and a high barrier layer (inner layer) . At present, the production of multilayer composite films at home and abroad usually...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D65/40B65D85/88B32B27/08
Inventor 刘继福
Owner 刘继福
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