High-performance film capacitor is used widely in such fields as new energy transportation vehicles

transmission and transformation engineering

medical treatment equipment

and electromagnetic pulse weapons

among which dry DC capacitor is an important equipment for flexible DC transmission. At present

the production process of film capacitor relies entirely on foreign technology from raw materials to equipment

and ultra-clean polypropylene (PP) raw materialsfor high-end film capacitor is entirely imported abroad. Moreover

such large production equipment as biaxially stretched BOPP films and electrode evaporation plating are purchased from developed countries

which seriously restricts the research and engineering application of film capacitor in China

which brings many hidden dangers especially in the current international environment. Once foreign countries prohibit the sale of raw materials and equipment to China

it will seriously affect our development of in high-tech field. Therefore

in the context of current international environment and the “dual carbon” goal proposed by the Chinese government

great efforts must be made to address the multiple key factors affecting the development of film capacitor

and rely on independent technology to serve the construction of new energy systems. Under the support of the National Key Research and Development Project “Dielectric Film Materials for Dry DC Capacitor”

the technical breakthrough of PP raw material is performed staring from the ultra-clean PP raw material for film capacitor and deep cooperation between research institutes of related fileds and related enterprises to solve the problems that exist in the research process. From a global perspective

we aim to solve the major problems faced by the engineering application of dry DC capacitors in China

forming key technology for the full-chain localization of dry DC capacitor in China.