Capacitor films with a thickness of only 3.8 μm were prepared using industrial-largescale processing (biaxial stretching). The high-temperature breakdown strength and charge/discharge properties of the blended film are significantly improved compared with that of pure BOPP film.
The high-temperature breakdown resistance of BOPP is a critical factor that directly impacts the effectiveness of film capacitors. We evaluated the breakdown strength of various BOPP/COC thin film at varying temperatures and analyzed the data using the Weibull distribution.
The high-temperature breakdown strength and charge/discharge properties of the blended film are significantly improved compared with that of pure BOPP film. In recent decades, enhancing the high-temperature resistance of capacitor films was a research focus, but largescale-producing high-temperature resistant films remains a difficult issue.
A thinner film in a capacitor prepared by film winding allows for more parallel groups or lower volume, as possible to realize the miniaturization and light-weight of devices , . Therefore, there is an important need in commercial applications to minimize film thickness by industrial-scale processing.
It is evident that the capacitance loss in pure BOPP film capacitors at high temperatures is substantial. Specifically, a 24 % loss in capacitance was observed after operating at 105 ℃ for 1000 h, with the capacitor essentially failing after more than 500 h of operation at 700 V and 125 ℃.
Notably, after assembly into capacitors through gold spraying, the capacitance loss of BOPP/COC blend film capacitors operating at 125 ℃ and 700 V (DC) for 1000 h is merely 5 %, while the pure BOPP capacitor has failed entirely at this time.
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