There is no generator to charge the capacitor in time. Instead, the capacitor needs to be charged with a battery. Theoretically, adding a farad capacitor can increase the battery discharge current, but the electric vehicle battery discharge current is enough, there is no need to increase the discharge current. Moreover, there will be leakage current in electrolytic capacitors. Repeated charging and discharging will lead to increased power consumption, which will shorten the driving range of electric vehicles. Even when charging, the capacitor can store a certain amount of electricity, but after the electric vehicle starts up, the storage capacity of the capacitor will be exhausted. Then the charge and discharge of the capacitor are taken from the battery, which increases the extra consumption of the battery, so it is meaningless to add a capacitor.