Advantage of the "Super Capacitor"
Capacitor storages electric energy based on adsorption/desorption of ion-molecules to/from electrodes surface. Rechargeable battery (Secondly battery) based on chemical reaction (e.g. oxidation-reduction). So, rechargeable battery deteriorate rapidly by iteration charge/discharge, high temperature and high rate (high electric current). In principle, Capacitor is not degenerate because of physical reaction.
Comparison of Rechargeable and Capacitor
Capacitor has undesirable characteristics as "Battery".
Capacitance error of each cells
Despite being manufactured with the latest production technology, each cell has a very large capacity error.
Therefore, a cell with a small capacity first becomes fully charged, and the overcharged state is reached.
Normally, this is solved by the equalization circuit, which causes efficiency reduction and heat generation
Difficulty of deep discharge
Output voltage of capacitor is not constant. The voltage is shifted in proportion to charge amount in the cell.
Since the input width of the power converter at the subsequent stage is limited, this characteristic makes deep discharge difficult.
Optimized Bank Switching Circuit For Capacitor Module
Need both of bank switching and equalization circuit.
No equalization circuit required.
Technology to enable impossibility!