Introduction to battery equalization charging for communication base stations

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FAQs 6

How is battery charge equalization achieved?

H. M. A et al. presented a battery charge equalization strategy where cells are sorted by voltage in descending order, and overcharged cells are discharged first. Then, differences between cells’ SOC and average SOC are used to control the EMS to achieve equalization.

How do you equalize a battery based on capacity?

Active equalization based on capacity during charging and discharging. Capacity-based equalization strategies take C C during charging and C R during discharging as equalization variables to determine whether a battery pack is consistent or not, and then equalize based on capacity.

What is a charging equalization method?

L. Dung proposed a charging equalization method that adapts itself to the aging conditions. It used the voltage difference among cells to adjust the equalization current, which not only maximized the total capacity but also slowed down the battery pack aging rate.

Why do we use battery pack capacity as the equalization objective?

The concept of using battery pack capacity as the equalization objective is that all cells are theoretically fully charged or discharged at the same time. Thereby it can avoid reaching cell cut-off voltages and make the battery stop charging or discharging even when the capacity or SOC is not zero , thus maximizing capacity utilization.

Do battery pack equalization strategies have a systematic review and classification?

After a thorough literature survey, it was found that there are many battery pack equalization strategies developed, but the systematic review and classification are missing. Some studies simply classify the equalization strategies based on the equalization variable, such as voltage, SOC, and capacity.

What is a capacity based equalization strategy?

Capacity-based equalization strategies take C T, C R, or C C as an equalization variable to improve the capacity utilization of a battery pack . In passive equalization, the maximum battery pack's C T is, theoretically, its minimum cell's capacity.