Laminate for outer packaging material of power storage device

By employing a substrate layer structure of polyester film and polyamide film in battery packaging materials, combined with an inter-substrate adhesive layer with specific properties, the problems of insufficient formability and chemical resistance in existing technologies are solved, resulting in a battery packaging material with high formability and impact resistance.

CN113745718BActive Publication Date: 2026-06-05LISSENOK PACKAGING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LISSENOK PACKAGING CO LTD
Filing Date
2021-05-25
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In the existing technology, battery packaging materials, when formed into sharp shapes and with high forming heights, cannot meet the requirements for sufficient formability and chemical resistance.

Method used

A multi-layer structure consisting of a barrier layer, a substrate layer, and a sealing layer is formed by using a substrate layer composed of a polyester film layer and a polyamide film layer, combined with an inter-substrate adhesive layer. The tensile breaking strength and elongation of the polyester film layer are within a specific range of MD and TD, and the hot water shrinkage rate of the polyamide film layer is controlled within 2.5% to 6%. A multifunctional isocyanate is used as a curing agent for the adhesive.

Benefits of technology

Even with sharp shapes and high molding heights, it still achieves sufficient formability and chemical resistance, avoids molding cracks, and improves the overall performance of battery packaging materials.

✦ Generated by Eureka AI based on patent content.

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    Figure CN113745718B_ABST
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Abstract

The present application relates to a laminate for an electric power storage device outer packaging material, and provides a laminate for an electric power storage device outer packaging material that can achieve sufficient moldability. A laminate for an electric power storage device outer packaging material (1) of the present application is characterized by comprising: a barrier layer (3) made of metal; a base material layer (2) formed of a heat-resistant resin that is laminated to an outer side surface of the barrier layer (3); and a sealing layer (4) formed of a heat-fusible resin that is laminated to an inner side surface of the barrier layer (3), the base material layer (2) is composed of a polyester film layer (21) as an outer side layer and a polyamide film layer (22) as an inner side layer, in terms of the polyester film layer (21), the sum of the tensile breaking strength in the MD and the tensile breaking strength in the TD is 500 MPa to 600 MPa, and the ratio of the tensile breaking strength in the TD to the tensile breaking strength in the MD is 0.8 to 1.1, and the tensile breaking elongation in the MD and the tensile breaking elongation in the TD are 110% to 200%. Here, MD: mechanical flow direction, TD: direction orthogonal to the MD.
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