Preparation method of ultra-thin high-temperature-resistant capacitor film applied to capacitors of electric and hybrid vehicles

Abstract

The invention discloses a preparation method of an ultrathin high-temperature resistant capacitance film applied to capacitors of power-driven and hybrid electric vehicles. The preparation method comprises the steps of throwing polypropylene into an extruder to perform melt extrusion, wherein the isotacticity of the polypropylene is higher than 99 percent, ash content is smaller than 15ppm, a melt index ranges from 3.2g / 10min to 3.7g / 10min, and a molecular weight distribution coefficient ranges from 4.5 to 5.5; drawing the polypropylene subjected to melt extrusion to a chilling roller with the temperature of 85 DEG C-100 DEG C to perform cooling forming to obtain a cast piece; performing longitudinal extension, transverse extension, thickness measurement, corona, primary aging treatment and second aging treatment on the cast piece to obtain the capacitance film. The ultrathin high-temperature resistant capacitance film has the advantages of being ultrathin, good in thickness uniformity, resistant to high temperature, good in film-forming property, excellent in mechanical performance and electric performance and capable of being applied to capacitors of power-driven and hybrid electric vehicles.

Description

technical field [0001] The invention belongs to the technical field of polypropylene capacitor films, and in particular relates to a method for preparing an ultra-thin (2-3 μm in thickness) high-temperature-resistant (above 110° C.) capacitor film applied to capacitors of electric and hybrid vehicles. technical background [0002] With the rapid development of science and technology, the automobile manufacturing industry has achieved unprecedented results, and the comprehensive innovation of technology has brought a high-speed growth market for electronic components, especially the increasing demand for ultra-thin high-temperature resistant polypropylene film capacitors. With the improvement of propylene capacitor film technology and the development of ultra-thin, ultra-thin high-temperature resistant polypropylene film capacitors have begun to be used in electric and hybrid vehicles. In the "12th Five-Year Plan", the national government vigorously advocates energy conservat...

AI Technical Summary

Problems solved by technology

The production level of metallized polypropylene film capacitors in my country has made great achievements. At present, the thickness of high-temperature-resistant polypropylene capacitor films produced by domestic manufacturers in batches is 3.5-15 μm, but the technology of 2-3 μm high-temperature-resistant polypropylene capacitor films is still immature. , the main problems are poor film formation, unsatisfactory thickness uniformity, low output rate, high cost, inability to stabilize mass production, and high temperature resistance cannot meet the requirements of use; the maximum working environment temperature of ordinary polypropylene film capacitors is 85 ℃, as the working time of the capacitor wound with ordinary polypropylene capacitor film increases, its internal temperature rises rapidly, which leads to a sharp decline in the stability of the capacitor, and even causes the capacitor to fail

Images