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Preparation and Properties of Flexible Packaging Materials for Lithium-ion Batteries

Author: QinZuo
Tutor: XuWeiBing
School: Hefei University of Technology
Course: Materials Science
Keywords: Cast polypropylene film Flexible packaging composite materials Lithium ion battery Heat sealability Plastic composite membrane
CLC: TB484
Type: Master's thesis
Year: 2010
Downloads: 123
Quote: 0
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Abstract


Use than traditional lithium ion secondary battery packaging and flexible packaging composite materials to the steel shell packaging reduction, light, etc., and quickly occupied the packaging market for lithium-ion. This paper, through the study of the innermost material CPP film flexible packaging materials for lithium ion secondary battery, to find the most suitable heat sealing layer material to study its anti-penetration of the contents of the nature and long-term sealing performance, and preparation of the composite of lithium-ion batteries with flexible packaging material, examine its overall performance. Research mainly includes the following two parts: (1) the lithium-ion battery with the innermost layer material of the flexible packaging composites of the structural design and manufacture, and select a polypropylene cast film material as the innermost layer, to determine its structure is a composite layer / supporting layer / heat seal layer; analyzed the performance of the polypropylene cast film at the same time. (2) the lithium-ion battery with a flexible packaging composite material structural design, and determine its structure is ON15/DL/Al40/Ac agent / EL/CPP50, dry lamination and extrusion lamination combination of complex manufacturing process of the lithium ion battery flexible packaging composite materials; analysis of the performance of the aluminum-plastic composite materials. The study results show that: (1) a high-speed production of CPP film performance is good compared with other types of CPP, CPPβ more suitable for flexible packaging materials for lithium-ion batteries. 50μm the CPPβ sealing time test, come to the best heat sealing time 1s. Good solvent sealing. CPPβ with a commercially available lithium ion batteries Flexible the innermost structure of the composite material are similar, the melt limit wide, suitable for a continuous production process. (2) the lithium-ion battery with a flexible packaging composite material for long-term mechanical properties test, no obvious changes in the tensile strength, elongation at break, tear strength and interlayer peeling strength. Its using DMC solvent after soaking, the tensile strength, fracture elongation, tear strength decreased slightly, the interlaminar peeling strength is changed significantly within a week, thereafter, their composite performance is substantially constant, the composite strength after soaking interlayer with commercially available lithium-ion batteries used quite flexible packaging composite strength. Flexible packaging composite materials for lithium-ion batteries None the solvent heat sealing and heat sealing DMC solvent, to both seal strength, the lithium-ion battery with flexible packaging composite sealing. Flexible packaging composite heat sealing performance of the lithium-ion battery and a large range of heat sealing, stable performance, the transverse heat seal strength is slightly higher than the longitudinal heat seal strength, best heat sealing process conditions for heat sealing temperature of 170 ° C heat The sealing pressure 180kPa and sealing time 3s, this condition is obtained by heat-sealing strength able to meet the industry on the lithium-ion battery with the heat seal strength of Flexible composite material requirements of ≥ 40N/15mm. Flexible packaging composite materials for lithium-ion battery the DMC simulation package, its innermost layer of material changes were characterized by FT-IR. After simulation package, the weight loss rate is low, heat sealing effect. After DMC encapsulated, the only surface of the inner material was little oxidized, its nature, within one year substantially no change.

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CLC: > Industrial Technology > General industrial technology > Industrial common technology and equipment > Packaging Engineering > Packaging materials
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