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Why is the equalization speed of Lifepo4 battery very slow?

by ZhanSimon 23 May 2023
Why is the equalization speed of Lifepo4 battery very slow?
Equalizing (or balancing) lithium iron phosphate (LiFePO4) batteries can be a slow process, especially when using passive balancing methods.

In passive balancing, the Battery Management System (BMS) discharges cells that have a higher charge to match those with a lower charge, usually by converting the excess charge into heat. This process is energy inefficient and can take a long time, particularly if the voltage differences between cells are large.

Active balancing methods, which transfer charge from higher charged cells to lower charged ones, are generally faster and more energy-efficient, but they are also more complex and expensive.

It's worth noting that LiFePO4 batteries are more tolerant to being out of balance than other types of lithium batteries. They have a flat discharge curve, which means that cells tend to stay in balance with one another more naturally during discharge and charge. However, over time and with usage, imbalances can still occur, hence the need for balancing.
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