Just got this in the mail from Linear Technologies
Might be interesting:
http://cds.linear.com/docs/en/lt-journal/LTJournal-V23N1-01-df-LTC3300-1-Drew.pdf
One chip can balance up to 6 cells. Multiple chips can be put in series
for larger packs. They mention packs of 100 cells for electric vehicles
specifically in the document.
Bert
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