Do battery energy storage systems need equalization?
Battery energy storage system is the object of this review. Equalization necessity of battery packs connected in series and parallel is analyzed. Equalization topologies, variables and control methods are reviewed. Future research challenges and outlooks of new equalization methods are prospected.
What are the different types of battery equalization methods?
Equalization method can be extended to almost all battery systems, including nickel and lead-acid batteries, since it is not dependent on battery cells’ characteristics . Equalization topologies for battery packs are categorized into active and passive equalization.
What happens if a battery pack is equalized?
In the fast-charging process, the charging current is large, even if the battery pack is equalized, the equalization current is much smaller than the charging current, and the equalization effect is poor, the necessity for equalization is average.
Should a battery pack be equalized in a fast-charging process?
Although it is not suitable to implement equalization in the fast-charging process, fast-charging tends to lead to further expansion of the consistency difference of the battery pack, which puts higher requirements on the equalization of the battery pack.
Is passive equalization suitable for small-capacity battery packs?
4.4. Prospects of the development for equalization topologies Passive equalization is suitable for the equalization of small-capacity battery packs with a small number of cells. For active equalization topologies, energy utilization is higher and less heat is generated.
Why should a series connected battery pack be equalized?
For a series-connected battery pack, when there is a consistency difference among the cells, it causes a decrease in the energy utilization and cycle life of the battery pack. Thus, the equalization of a series-connected battery pack is necessary.
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