Flexible package film for external resistance layer of polymer lithium ion battery

A technology for lithium ion batteries and flexible packaging films, applied in battery pack parts, circuits, electrical components, etc., can solve the problem of poor bonding compatibility between thermoplastics and metal aluminum foils, increased heat-sealing failure rate of flexible packaging composite materials, and box making. Problems such as the increase in the scrap rate of deep drawing, etc., achieve the effects of excellent plastic interaction elongation and composite firmness, excellent stability, and large initial adhesion.

Inactive Publication Date: 2012-03-21
刘继福
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Problems solved by technology

The disadvantage of bonding metal aluminum foil by hot melt adhesive is that the bonding compatibility between general thermoplastics and metal aluminum foil is extremely poor
For lithium-ion batteries, high temperature is likely to shorten the cycle life of the battery and reduce the discharge capacity of the rate; at the same ti

Method used

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  • Flexible package film for external resistance layer of polymer lithium ion battery

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Embodiment Construction

[0018]In the following embodiments, the flexible packaging film for the outer resistance layer of the polymer lithium ion battery includes at least one layer of heat-resistant resin film, which can be selected from: polyethylene terephthalate (PET), nylon Any one of (BOPA) and polyethylene naphthalate (PEN) is used as the external resistance layer of the polymer lithium-ion battery. It is also preferable to choose PEN / PET copolyester film. PEN / PET copolyester film contains 0.1% (mass fraction) ~ 0.4% (mass fraction) SiO 2 Microparticles, and carry out transesterification reaction synthesis intermediate 2,6-ethylene naphthalate (BHEN) by dimethyl naphthalene dicarboxylate (NDC) and ethylene glycol (EG), and BHEN content is 8% ( mole fraction). PEN / PET copolyester film uses zinc acetate as a catalyst, hindered phenol 1010 as an antioxidant, and the reaction temperature is 295°C; the amount of catalyst per mole of BHEN is 4×10 -4 mol, the reaction time is 180min; the amount of...

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Abstract

The invention provides a flexible package film for the external resistance layer of a polymer lithium ion battery, aiming to provide a flexible package film for an external resistance layer. The flexible package film can be bonded and compatible with a metal aluminum foil, cannot be cracked when an outer membrane and an adhesive molecular chain plastically flow and extend in the scour depth process, and has high shock-resistant, peel-strength-resistant and externally environmental-infiltration-resistant performances and good extensibility. The flexible package film for the external resistance layer comprises at least one layer of heat resistant resin film, and is characterized in that the heat resistant resin film is one of polyethylene terephthalate (PET), nylon (BOPA) and polyethylene naphthalate (PEN), wherein PEN/PET copolyester film contains SiO2 particles the mass fraction of which is from 0.1% to 0.4% and can be synthesized into an intermediate 2,6-naphthalic acid gylcol ester (BHEN) by an ester exchange reaction between naphthalene dicaboxylate (NDC) and ethylene glycol (EG), and the BHEN contents are 8% (molar fraction); and a two-component polyurethane resin adhesive is coated on the inner side of the heat resistant resin film.

Description

technical field [0001] The invention relates to a flexible packaging film for the outer resistance layer of a polymer lithium ion battery. Background technique [0002] The polymer lithium-ion battery external resistance soft coating is the first layer of the polymer lithium-ion battery flexible packaging film to prevent external oxygen and water vapor from penetrating into the lithium-ion battery electrolyte to produce high-strength corrosive chemical reactions. The barrier performance of the outer barrier flexible packaging film is mainly related to the barrier film and the adhesive. Although the base molding material is not in direct contact with the lithium-ion battery electrolytic packaging items, the synergistic mechanical properties of the molding material combined with the barrier layer aluminum foil are directly related, especially the mechanical properties of the synergistic combination of viscose, which will affect the packaging. Membrane forming effect. The pri...

Claims

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Application Information

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IPC IPC(8): C08L67/02H01M2/16C08K3/36C08L77/00
CPCY02E60/12Y02E60/10
Inventor 刘继福
Owner 刘继福
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