At present

for the problems

which exit in electric vehicles

such as high initial cost

short mileage per charge and so on

the electric vehicle usually use capacitors as auxiliary source to balance loads and to absorb regeneration braking energy rapidly.Compare with the ultra-capacitors used in the electric vehicle

the film capacitors segment has high volts and no use for the balance of charging or discharging of segment.Therefore

it has advantages such as simple structure

low cost

best anti-vibration

no polarity and has broad applied foreground.The testing results of film capacitor indicate

that the large capacitance film capacitor can be used to absorb regeneration braking energy rapidly

and high power discharge.Nevertheless

the large capacitance film capacitor can come into practicality stage as long as the problems such as low energy density and high self-discharging loss of film capacitor system are solved.