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Aluminum plastic compound film with excellent heat sealing property and low-temperature flexibility

An aluminum-plastic composite film and low-temperature toughness technology, applied in the field of aluminum-plastic composite film, can solve the problems of narrow heat-sealing window, poor heat-sealing strength, insufficient low-temperature toughness, etc., and achieve a wide heat-sealing temperature range and low heat-sealing lower limit temperature. , The effect of low initial heat sealing temperature

Inactive Publication Date: 2017-01-25
GUANGDONG ANDELI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the heat-sealing temperature is not high enough or the heat-sealing time is not long enough, the heat-sealing strength will be poor and it will be difficult to meet the use requirements
Moreover, the polypropylene layer has poor toughness, especially low-temperature toughness. During the drawing forming process or the assembly of batteries after forming, if encountered in a low-temperature environment, it is often prone to brittleness, insufficient toughness, and easy to be damaged.
[0004] In short, the existing aluminum-plastic composite film has poor heat-sealing performance (heat-sealing temperature is too high, heat-sealing window is too narrow, etc.), and the toughness, especially the low-temperature toughness, is insufficient, which cannot meet its needs in lithium-ion batteries. Application requirements on the packaging

Method used

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  • Aluminum plastic compound film with excellent heat sealing property and low-temperature flexibility
  • Aluminum plastic compound film with excellent heat sealing property and low-temperature flexibility
  • Aluminum plastic compound film with excellent heat sealing property and low-temperature flexibility

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] refer to figure 1 , the aluminum-plastic composite film with excellent heat-sealing performance and low-temperature toughness of this embodiment sequentially includes a heat-sealing layer 1, a first adhesive layer 4, an aluminum foil layer 2, a second adhesive layer 5 and an outer protective layer from the inside to the outside 3; the heat-sealing layer 1 is composed of a cast polypropylene film, and the relative percentage of the β-crystal form in the cast polypropylene film to the total crystalline portion of polypropylene is 57.8%; the outer protective layer 3 is biaxially oriented polyethylene terephthalate Ethylene glycol formate layer.

[0041] The preparation method of cast polypropylene film comprises the following steps:

[0042] (1) By mass, the following raw materials are equipped: 0.02% of β crystal nucleating agent (both are calcium pimelate), 3% of nano silicon dioxide, and the balance is polypropylene (wherein 80% is polypropylene homopolymer material, ...

Embodiment 2

[0048] refer to figure 1 , the aluminum-plastic composite film with excellent heat-sealing performance and low-temperature toughness of this embodiment sequentially includes a heat-sealing layer 1, a first adhesive layer 4, an aluminum foil layer 2, a second adhesive layer 5 and an outer protective layer from the inside to the outside 3. The heat-sealing layer 1 is composed of a cast polypropylene film, and the relative percentage of the β-crystal form in the cast polypropylene film to the total crystalline portion of polypropylene is 65.7%; the outer protective layer 3 is a biaxially stretched polyamide layer.

[0049] The preparation method of cast polypropylene film comprises the following steps:

[0050] (1) By mass, the following raw materials are equipped: 0.3% of β crystal nucleating agent (both are N,N-dicyclohexyl-2,6,-naphthalene dicarboxamide), 3% of nano silicon dioxide, and the remaining The amount is polypropylene (90% of which is polypropylene homopolymer and 6...

Embodiment 3

[0056] refer to figure 1 , the aluminum-plastic composite film with excellent heat-sealing performance and low-temperature toughness of this embodiment sequentially includes a heat-sealing layer 1, a first adhesive layer 4, an aluminum foil layer 2, a second adhesive layer 5 and an outer protective layer from the inside to the outside 3; the heat-sealing layer 1 is made of a cast polypropylene film, and the relative percentage of the β-crystal form in the cast polypropylene film to the total crystalline portion of polypropylene is 40.7%; the outer protective layer 3 is biaxially oriented polyethylene terephthalate Ethylene glycol formate layer.

[0057] The preparation method of cast polypropylene film comprises the following steps:

[0058] (1) By mass, the following raw materials are equipped: 0.5% of β crystal nucleating agent (wherein 0.3% is γ-quinacridone, and 0.2% is dihydroquinacridone), 3% of nano silicon dioxide, and the remaining The amount is polypropylene (70% o...

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Abstract

The invention provides an aluminum plastic compound film with excellent heat sealing property and low-temperature flexibility. The aluminum plastic compound film is characterized by comprising a heat sealing layer, a first glue sticking layer, an aluminum foil layer, a second glue sticking layer and an outer protecting layer in turn from inside to outside, wherein the heat sealing layer is made from a casting polypropylene film; the beta crystal in the casting polypropylene film is 30-99% of total crystalline portion of polypropylene; the outer protecting layer is arranged as a bidirectional stretching polyethylene terephthalate (bidirectional stretching PET layer) or a bidirectional stretching polyamide layer (bidirectional stretching PA layer). The aluminum plastic compound film provided by the invention has higher heat sealing temperature, lower heat sealing lower-limit temperature and more excellent flexibility, especially, flexibility under low-temperature environment.

Description

technical field [0001] The invention relates to a packaging material for battery casings, in particular to an aluminum-plastic composite film with excellent heat-sealing performance and low-temperature toughness. Background technique [0002] Lithium-ion batteries are known as "the most promising chemical battery" because of their advantages such as high working voltage, small size, light weight, high specific energy, small self-discharge, wide application temperature range, long cycle life, no pollution, and good safety performance. Energy", widely used in mobile phones, laptops, video cameras, cameras and other electronic equipment, as well as the power supply of power vehicles. Lithium-ion batteries can use aluminum-plastic composite film as the packaging material, which is heat-sealed and packaged to form a shell to protect the battery body. In order to fully wrap the entire battery body and withstand the impact of heat, electrolyte and mechanical force, the inner layer...

Claims

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Application Information

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IPC IPC(8): H01M2/02B32B7/12B32B15/085B32B15/088B32B15/20B32B27/18B32B37/15H01M50/124
CPCB32B7/12B32B15/085B32B15/088B32B15/20B32B27/18B32B37/15H01M50/124Y02E60/10
Inventor 王丹旭
Owner GUANGDONG ANDELI NEW MATERIALS CO LTD
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