Barrier layer soft package film of polymer lithium ion battery

A lithium-ion battery, flexible packaging film technology, applied in packaging, wrapping paper, transportation and packaging, etc., can solve problems such as the inability to effectively block the penetration of battery contents, the unsatisfactory effect of photochemical treatment, and the long processing time of chemical treatment. To achieve the effect of excellent plastic interaction elongation and composite fastness, excellent bonding compatibility, and no pinholes in bonding

Inactive Publication Date: 2012-02-22
刘继福
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Experiments have proved that whether it is lamination with dry coating organic solvent adhesive, wet coating inorganic adhesive lamination, or hot melt coating lamination, the disadvantage of using the same adhesive layer on both sides is that it cannot Effective barrier to the penetration of battery contents
[0008] The chemical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] In the following examples, the aluminum foil is composed of aluminum Al, iron Fe, silicon Si, copper Cu, manganese Mn and / or magnesium Mg as main chemical components, wherein silicon Si: 0.09wt% to 0.9wt%, iron Fe : 0.9wt% ~ 1.5wt%, the sum of Fe+Si content is 0.99% ~ 2.4% (wt), copper Cu: 0.006wt% ~ 0.03wt%, manganese Mn and magnesium Mg: 0.04% ~ 0.05% (wt ), or manganese Mn: 0.03wt% ~ 0.05wt%, or magnesium Mg: 0.005wt% ~ 0.010wt%, aluminum Al is the balance, generally the Fe / Si ratio of Al-Fe-Si alloy is 10.0% ~ 1.67 %. The balance of aluminum Al may be 99.0% or more. Any value can be selected according to the above range. The total content of other added alloy trace elements is not more than 0.15% (wt).

[0015] The inner and outer surfaces of the aluminum foil can be corona on one side or on both sides. High-power corona aluminum foil of 3 kW-10 kW or above can be used. The greater the power, the more ozone will be generated, and the higher the temperature will ...

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Abstract

The present invention provides a barrier layer soft package film of a polymer lithium ion battery. The barrier layer soft package film comprises a layer of aluminum foil, wherein both sides of the aluminum foil are coated with an adhesive layer, the aluminum foil at least comprises silicon (Si), iron (Fe), copper (Cu), manganese (Mn) and aluminum (Al), the Fe content is 0.9-1.5 wt%, a Fe/Si ratio is 10.0-1.67%. At least one surface of the inner surface and the outer surface of the aluminum foil is treated by corona. The surface of the adhesive external resistance layer is coated with a double-component polyurethane resin adhesive and a polyester polyol adhesive. In the prior art, when the Fe content in the aluminum foil is more than 0.9 wt%, the softness of the aluminum is damaged, the bag making performance of the laminate becomes poor; when the Fe/Si ratio in the industrial pure aluminum is more than 5%, the processing hardening rate is increased. With the present invention, the problems in the prior art are overcome. The experiment results show that: the formed barrier layer of the present invention has characteristics of tensile strength more than 80-98 Mpa, elongation more than 21%, a cupping test value more than or equal to 6.10, elongation at break more than or equal to 40 N and heat sealing strength more than or equal to 40 N; under the pressure of 25 (kpa), no leakage and no rupture are generated.

Description

technical field [0001] The invention relates to an intermediate layer soft packaging material in at least three layers of barrier layer soft packaging films for polymer lithium ion batteries. Background technique [0002] The polymer lithium-ion battery barrier layer soft coating is a solid anti-permeable material that blocks the intrusion of water and oxygen in the polymer lithium-ion battery outer barrier layer, and prevents the volatile solvent content of the battery electrolyte from penetrating. The barrier performance of the flexible packaging film of the barrier layer is mainly related to the aluminum foil barrier film and the adhesive. It is closely related to the bonding strength and plastic deformation ability between the aluminum foil of the barrier layer and the inner and outer layers, and the peel strength between the aluminum foil and the inner and outer layers directly affects the sealing performance of the battery. The synergistic combination of the adhesive ...

Claims

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Application Information

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IPC IPC(8): B32B15/095B32B15/20B32B27/04B32B38/18B65D65/40B65D85/88C09J175/06C09J175/08
Inventor 刘继福
Owner 刘继福
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