随着汽车电气化的加剧，汽车电路系统的电压和输出功率有了大幅度的提升，关键部件对电子元器件的耐压耐冲击能力要求更为严格。工作条件的变化对电子系统中的电容元器件的性能提出新的要求，从而拉动了汽车产业对薄膜电容器的需求。

　　With the intensification of automobile electrification, the voltage and output power of automotive circuit system have been greatly improved, and the key components have more stringent requirements on the withstand voltage and impact resistance of electronic components. The change of working conditions puts forward new requirements for the performance of capacitor components in electronic system, which drives the demand of film capacitor in automobile industry.

　　薄膜电容器是电动汽车驱动电路中的主要元件，主要起平滑的作用。逆变器将电池的直流电通过转换器转换成变动较小的电压，再通过IGBT 开关元件转换成近似于交流电的矩形波，由此产生的浪涌电压很大，需要采用平滑电容器消除。

　　Thin film capacitor is the main component of electric vehicle drive circuit, which plays a smoothing role. The inverter converts the DC power of the battery into a relatively small voltage through a converter, and then converts it into a rectangular wave similar to alternating current through IGBT switching elements. The surge voltage generated by this is very large and needs to be eliminated by using a smooth capacitor.

　　在新能源汽车电机驱动和控制电路中，需要的主要电子元器件是功率半导体器件IGBT 、控制IC 以及电容器，其中，IGBT 占大约2/3 的成本。

　　In the motor drive and control circuit of new energy vehicles, the main electronic components are power semiconductor device IGBT, control IC and capacitor, of which IGBT accounts for about 2 / 3 of the cost.

　　电机控制技术的核心就是需要高效电机控制的逆变器技术，高效电机控制的逆变器技术则需要一个功能强大的IGBT 模块和一个与之匹配的直流支撑电容器。

　　The core of motor control technology is the inverter technology which needs high-efficiency motor control. The inverter technology of high-efficiency motor control needs a powerful IGBT module and a matching DC support capacitor.

　　电机控制器主回路示意图

　　早期的平滑电容器曾采用铝电解电容，但为了提高效率，电机驱动的最大电压从500V 提高到了650V 后，铝电解电容的耐压不足，薄膜电容器成为主流。

　　Aluminum electrolytic capacitor was used in the early smooth capacitor, but in order to improve the efficiency, the maximum voltage driven by motor was increased from 500V to 650V, and the withstand voltage of aluminum electrolytic capacitor was insufficient, and thin film capacitor became the mainstream.

　　新能源汽车将原有的铝电解电容器替换成为薄膜电容器。

　　New energy vehicles replace the original aluminum electrolytic capacitors with thin film capacitors.

　　一方面是因为薄膜电容的耐压耐冲击特性使它非常适合在新能源汽车的电气环境下使用。

　　On the one hand, the film capacitor is very suitable for use in the electrical environment of new energy vehicles because of its voltage and impact resistance.

　　另一方面，在过去多年的发展中，薄膜电容器的体系和重量减少了3~4 倍，同时改进了金属化的分割技术，从而极大的帮助了薄膜电容的发展。

　　On the other hand, in the past years of development, the system and weight of thin-film capacitors have been reduced by 3-4 times. At the same time, the segmentation technology of metallization has been improved, which greatly helps the development of thin-film capacitors.

　　在新能源汽车领域，现有的铝电解电容器未来将部分被薄膜电容所取代。目前已有越来越多的公司用薄膜电容替代电解电容。同时，在DC/DC 、电机控制系统、电池管理系统等高压电气单元中，薄膜电容的使用量也会随着新能源汽车的推广和普及而上升。

　　In the field of new energy vehicles, the existing aluminum electrolytic capacitors will be partially replaced by thin film capacitors in the future. At present, more and more companies have replaced electrolytic capacitors with thin film capacitors. At the same time, in DC / DC, motor control system, battery management system and other high-voltage electrical units, the use of thin-film capacitors will also increase with the promotion and popularization of new energy vehicles.