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Soft package film of lithium battery and its preparing process

A flexible packaging film, lithium battery technology, applied in the directions of packaging, wrapping paper, transportation and packaging, etc., can solve the problem of aluminum layer unfavorable cold stamping, poor cold stamping performance, polyethylene terephthalate layer stretching Good electrical insulation effect, guaranteeing waterproofness, good cold stamping formability, etc.

Inactive Publication Date: 2003-12-03
JIANGSU ZHONGJIN MATAI MEDICINAL PACKAGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problems are: the stretchability of the polyethylene terephthalate layer is not good, the cold stamping performance is not good, and the aluminum layer is too thin, which is not conducive to cold stamping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1, a flexible packaging film for lithium batteries, which consists of an outer layer composed of a polyethylene terephthalate layer and a polyamide polymer layer, an intermediate aluminum layer, and a polyamide polymer layer from outside to inside. The inner layer is composed of a polypropylene layer; the polyamide polymer adopts polycaprolactam. The thickness of the outer polyethylene terephthalate layer is 9 microns, the thickness of the outer polyamide polymer layer is 15 microns, the thickness of the middle aluminum layer is 40 microns, and the thickness of the inner polyamide polymer layer is 15 microns, and the thickness of the inner polypropylene layer is 35 microns.

Embodiment 2

[0010] Embodiment two, in the above-mentioned embodiment, also can adopt the outer layer that is composed of polyethylene terephthalate resin layer and polyamide polymer layer, middle aluminum layer, polypropylene layer from outside to inside successively. layer; the polyamide polymer adopts polyhexamethylene adipamide. The outer polyethylene terephthalate layer has a thickness of 10 microns, the outer polyamide polymer layer has a thickness of 20 microns, the middle aluminum layer has a thickness of 50 microns, and the inner polypropylene layer has a thickness of 50 microns.

Embodiment 3

[0011] Embodiment 3, in the above-mentioned embodiment 1, an outer layer composed of a polyamide polymer layer, an intermediate aluminum layer, a polyamide polymer layer and an inner layer composed of a polypropylene layer may also be used from the outside to the inside in sequence; The above-mentioned polyamide polymer adopts polyhexamethylene sebacamide. The outer polyamide polymer layer has a thickness of 25 microns, the middle aluminum layer has a thickness of 60 microns, the inner polyamide polymer layer has a thickness of 25 microns, and the inner polypropylene layer has a thickness of 50 microns.

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Abstract

A soft packing film for lithium battery is composed of aluminium layer as basic layer, the ethylene polyterephthalate and polyamide polymer layers attached to the external surface of basic layer, and the polyamide polymer and polypropylene layers attached to the internal surface of basic layer. Its advantages are high strength, resistance to water moisture, and electrolyte, airtightness and electric insulation, high prick resistance, and high machinability (cold punching).

Description

technical field [0001] The invention relates to a composite molded flexible packaging film, in particular to a lithium battery flexible packaging film that requires high barrier and cold stamping formability. Background technique [0002] The prior art closest to the present invention is the Chinese patent No. ZL99212336, which discloses a flexible packaging film for lithium batteries, which includes an outer, middle, and inner three-layer structure, wherein the middle layer is an aluminum layer, and the outer layer is made of polystyrene. Ethylene terephthalate, coated with a low-density polyethylene layer on the inner surface of the aluminum layer, and then coated with an ethylene-(meth)acrylic acid copolymer layer on the low-density polyethylene layer, low-density polyethylene The vinyl layer together with the ethylene-(meth)acrylic acid copolymer layer constitutes the inner layer. The existing problems are: the adopted polyethylene terephthala...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04B65D65/40B65D85/88
Inventor 李永安徐立球徐根华徐金官李学兵
Owner JIANGSU ZHONGJIN MATAI MEDICINAL PACKAGING
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