The LiFe battery has advantages of large charge current, safety, high stable and abundant material
resources. However, it has disadvantage that the consistency of unit cell is poor in charge/discharge.
One bi-directional DC-DC buck-boost converter circuit and three bi-directional DC-DC buck-boost converter
are used to charge/discharge three battery set (3*4 Cell) to compare the characteristic of batteries. The
experimental results show that the function of voltage equalizer in the discharge process of three bi-directional
DC-DC buck-boost converter can extend the discharge time of battery set.