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Can active balancers damage LiFePo4 cells at low temperatures?

Ludger

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Joined
Apr 11, 2021
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Hi!

I was wondering if active balancers can damage LiFePo4 cells at low temperatures, because they bypass the BMS. Or is a 1.2 A current too low to do any damage. What about 5 A balancing current then? I really have no idea. I imagine that the cell voltages diverge at low temperatures as has happened to me after a week at ca. -16 °C / 3 °F and then the balancing is triggered. After the winter one cell was at 2.2 V and the three others were at 3,2V roughly. (The balancing/voltage sensing wire to that 2.2 V cell was under mechanical tension, maybe that was the reason for the difference, but that's not part of my question. Daly (non smart) BMS 100 A continuous)

Thanks for you attention
Ludger
 
Interesting question.... I had not thought about that. It seems logical that if an active balance tries to move charge in sub 0C conditions damage could happen. However, you can charge lifepo4 at very low currents in cold conditions. 5 amp on a 280Ah cell is only .02 C so maybe it would be ok....but I would not want to risk it.
 
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