Li-Ion BMS video: Top vs bottom balancing

4284 Views 5 Replies 5 Participants Last post by EVfun, Jul 22, 2011

Elithion

Discussion Starter · Jul 21, 2011

For those of you who use Li-Ion cells, but don't have the Li-Ion BMS book, I am recording a series of videos on Li-Ion BMS issues.

The first set discusses the 8 reasons why only top balancing is appropriate for battery packs for energy use.
http://www.youtube.com/watch?v=rALhwf9ojZQ

I'll announce the next videos as they come out.

Davide

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Jozzer

· #3 · Jul 22, 2011

EVfun said:
There is more than one way to do things. Bottom balancing seems to be a viable option that DeWalt has chosen to patent. I thought it was interesting, a cell level BMS with shunt loads used to actively bottom balance. JR must be having a love/hate relationship with this

The difference with Dewalts method is they still balance every cycle, and monitor cell voltages at all times. FYI their balancer also top balances. Also worth noting is the very high failure rate of Dewalt packs. All in all not a great example to give!

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