Black aluminum plastic film and polymer lithium battery

Abstract

The invention relates to the technical field of polymer lithium batteries, in particular to a black aluminum plastic film and a polymer lithium battery adopting the black aluminum plastic film. The aluminum plastic film comprises a casting polypropylene film layer, an aluminum foil layer and a polyarmide fiber layer which are overlapped in sequence, at least one of the layers contained by the black aluminum plastic film is black, wherein the black casting polypropylene film layer is a black layer prepared by mixing and casting a casting polypropylene film and black master batch, and the black polyarmide fiber layer is a black layer prepared by mixing and casting polyarmide fiber and black master batch. Compared with the prior art, as the black layers are designed in the aluminum plastic film, the aluminum plastic film is good in smoothness, chemical resistance, character prominence and character color variability. Characters on the surface of the polymer lithium battery have good prominence and color variability, meanwhile, carbon black in the black layers brings excellent chemical resistance, and therefore the service life of the polymer lithium battery is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of polymer lithium batteries, in particular to a black aluminum-plastic film used to coat electrolyte solutions of polymer lithium batteries and a polymer lithium battery using the black aluminum-plastic film. Background technique [0002] According to the different electrolyte materials used, lithium batteries are divided into two categories: liquid lithium batteries and polymer lithium batteries. The electrolyte material of liquid lithium batteries uses liquid electrolyte, and the electrolyte material of polymer lithium batteries uses colloidal polymer electrolyte. Polymer battery is a new type of battery. Compared with liquid lithium battery, it has many obvious advantages such as high energy density, miniaturization, ultra-thinness, light weight, and high safety. [0003] Domestic polymer lithium batteries are mostly soft-pack batteries, and the aluminum-plastic film is used as the shell to encapsulate t...

AI Technical Summary

Problems solved by technology

[0005] First, the existing aluminum-plastic film products have a single appearance design and the prominence of text is limited. The existing aluminum-plastic film is mainly composed of transparent cast polypropylene film, transparent polyamide fiber, transparent adhesive and aluminum foil. Therefore, from the appearance, the aluminum-plastic film shows the color of the aluminum foil itself, so when the text color of the product information printed on the surface of the aluminum-plastic film is white or other light colors, its appearance is poor, making the aluminum The appearance design of the plastic film is not rich enough

[0006] Second, the initial smoothness of the raw materials of the existing aluminum-plastic film is generally good, but with the demand of the process temperature in the aluminum-plastic processing process, the smoothness of the finished aluminum-plastic film becomes worse

Poor smoothness leads to low punching depth of aluminum-plastic film, and low frequency of defects in the production process

As a result, the capacity of the aluminum-plastic film to cover the electrolyte is small, and the manufacturing cost is increased due to the influence of the low yield

[0007] Third, the existing aluminum-plastic film has poor chemical resistance or chemical resistance. Since the aluminum-plastic film is used to coat the electrolyte of polymer lithium batteries, the defects of poor chemical resistance or chemical resistance directly lead to the use of the aluminum-plastic film. The service life of the polymer lithium battery of the film is greatly reduced

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