Hi Chris,
Several friends here in New Zealand have built electric cars and home battery storage systems using lithium cells and no BMS - just bottom balancing. Some of these battery banks have been in use for years without any active balancing.
I have similar experience with LFP cells used in battery storage for off-grid solar systems, although in my case I only started using lithium cells around 3 years ago (some of my friends started 6-7 years ago).
The brands of LFP cells we have the most experience with are Winston and CALB and we have recently purchased some ETC cells to trial.
Cheers,
Carl
---In electricboats@yahoogroups.com, <clh5_98@...> wrote :
James (not Lamden),
are you proposing that a BMS is not necessary for a Lithium pack. I have heard of this being done. Even one distributor of CALB cells has a white paper discussing this. Essentially they bottom balance the cells individually before hooking them in series and then just never charge them beyond 3.5 VPC, or let them go below, I think 2.5 VPC. Seems like, with periodic cell monitoring like you mentioned and a fully configurable, high quality charge that going BMS less is possible. Thoughts anyone?
Chris
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Posted by: carl.barlev@gmail.com
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