The application of super capacitor in the field of rail transit is relatively mature. It can realize electric traction regenerative braking, stabilize the catenary voltage, save electric energy, and ensure the stable power supply of the electric power system. Whether it is an ordinary capacitor or a supercapacitor, the storage of charge or electric energy is a critical performance. Supercapacitors have larger charge storage capacity, which can meet the needs of more electronic components. However, the function of supercapacitor is similar to that of conventional capacitor during use. The functions of the new capacitor device are concentrated in: bypass, decoupling, energy storage, etc., which have an obvious regulating effect on circuit operation or charge storage.

Research on aging mechanism of supercapacitor in different application fields and control strategy of supercapacitor energy storage system will be another research hotspot of supercapacitor, which will help optimize the design of supercapacitor energy storage system. Compared with battery energy storage, supercapacitor will have greater advantages in power density, maintenance cost, service life and environmental adaptability, and will become an ideal choice for energy storage systems in electrical, power, electronics and other industries.

The electric double layer supercapacitor is regarded as two inactive porous plates suspended in the electrolyte, and the voltage is loaded on the two plates. The potential added to the positive plate attracts the negative ions in the electrolyte, and the negative plate attracts the positive ions, thus forming a double electric layer capacitor on the surface of the two electrodes. In the field of new energy vehicles, super capacitors can be used together with secondary batteries to store energy and protect batteries. usually Super capacitor module It can be used together with lithium ion battery to form a power supply for electric vehicles with stable performance, energy conservation and environmental protection, which can be used for hybrid electric vehicles and pure electric vehicles.