Blog - Chargers and charging

FAQ: balancing of the cells at the inital charge

26.Dec 2011
| Blog - Chargers and charging

FAQ: I have assembled a new battery pack. I have a BMS that balances with 2A of heat discharge on each cell. I keep charging my cells for many hours already and some cells are already full and some cells are not charged yet. What is the problem?

Answer: Please follow the lithium battery operation instructions closely:  the cells must be charged individually to full voltage level (typically 4.0V) before assembling the battery pack. This way the cells will be fully charged and balanced before the first use of the battery pack and there will be no need to balance the cells using the BMS with balancing. (Additionally to the first installation, we recommend to checking the cells of the battery pack from time to time and making the full balancing of all the cells, by means of the individual charging.)

Note: Concerning the balancing using the heat dissipation (over the BMS modules): keep in mind that it takes a lot of time to balance the cells this way. If you have 300Ah cells with +/- 20% misbalance, you need to balance up to 40 Ah of capacity. With 2 A balancing current, you may need 20 hours to finish the balancing. Even more, you waste a lot of energy that will be discharged at the cells that are already fully balanced. That is why we do not recommend to balance the cells this way.

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