Abstract
To overcome the problem of switching loss during the balancing process, a novel cell balancing circuit is proposed with the integration of a zero current switching technique. Moreover, the balancing circuit proposed can change between a classical buck-boost pattern and a resonant switched-capacitor pattern with flexible control to cater to the balancing requirements under different driving scenarios. The results of the simulation of field experiments demonstrate successful balancing, various balancing speed, and low energy loss. The proposed balancing circuit proves to be effective for a wide range of application and is the first attempt to integrate a dual balancing function in a single balancing circuit for cells.
Highlights
The pursuit of better battery performance has become the top challenge for electric vehicle (EV)
It is observed that VSC1, VSC2, and VSC3 converge to the same voltage level in all circumstances
The proposed circuit has advantages in performing balancing for different EV driving modes so that it is more flexible for an energy storage system which has different working conditions
Summary
The pursuit of better battery performance has become the top challenge for electric vehicle (EV). For energy-saving purposes, an active balancing method is put forward so that the charging and discharging current of each cell can be controlled to keep the same SoC among all cell units for the higher energy to be transferred into the cells with lower energy using a power converter circuit, instead of wasting it as heat loss This method has proven to be more efficient, many advanced voltage equalizers have been designed based on the active method using converters [13,14], switched-capacitors [15,16,17,18], transformers [7] or switched inductors [19,20].
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