Thin-film capacitor for automobile

Abstract

The invention relates to the field of a new-energy electric automobile, in particular to a thin-film capacitor for an automobile. By the thin-film capacitor, a capacitor technological level can be enhanced, volume can be reduced, moreover, high-frequency induction eddy current can be effectively shielded due to electrical performance, current trend is reasonably distributed, the capacitor reaches minimum equivalent series resistance (ESR) and equivalent series inductance (ESL), the heating of the capacitor is greatly reduced, the heat dissipation capability of the capacitor is improved, and thus, a product possesses excellent performance and is more safe and reliable. The thin-film capacitor comprises a shell and is characterized in that a leading-out end composite copper bar is arranged in the shell, the leading-out end composite copper bar comprises an upper-layer copper bar, an intermediate insulation plate and a lower-layer copper bar, one end of a capacitor core is connected with the upper-layer copper bar via a welding copper plate, and the other end of the capacitor core is connected with the lower-layer copper bar via a welding copper plate.

Description

technical field [0001] The invention relates to the field of new energy electric vehicles, in particular to a film capacitor for vehicles. Background technique [0002] Capacitors are generally used in three places in a car: energy storage, motor and electronic control. In the design of the power supply part of new energy vehicles, it is necessary to use high-voltage capacitors for smoothing and filtering applications. Usually, the working environment inside the car is harsh, and capacitors are required to have high temperature resistance, high reliability, and long life. Compared with aluminum Electrolytic capacitors have great advantages. Therefore, the first-generation Toyota Prius hybrid car used aluminum electrolytic capacitors, and the second-generation Prius began to use film capacitors. [0003] From the research on the electrical properties of film capacitors, it can be seen that compared with electrolytic capacitors, it has the advantages of high working voltage,...

AI Technical Summary

Problems solved by technology

[0004] However, for the special application of electric vehicles, the ambient temperature is high (85°C~105°C), and the heat dissipation conditions are not good; at the same time, the working current is large and the frequency is high; and the volume is required to be small, and the interior space of the car should be reduced as much as possible.

Therefore, conventionally designed film capacitors cannot meet their requirements. Long-term work in this harsh working condition will easily lead to a decrease in capacity, unable to withstand large currents, and even failure in severe cases.

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