On 3/13/21 11:18 AM, Willie via EV wrote:
Jack Rickard's... primary point
was that bottom balanced voltage would drop off so perspicaciously as
the battery neared full discharge that there was little risk of ignoring
a few low cells as might be the case with top balancing.
I can see the point that IF you are going to drive your lithium battery
pack without a BMS, it's better if all cells get down to zero capacity
as close to the same time as possible so that no cell will hit full zero
and get reversed by current flow (which is VERY likely to cause a fire...)
But as others have said, I believe you should have at a minimum a per
cell low voltage alarm when driving, and an automatic per-cell high
voltage charger cutoff when charging. [Perhaps you don't need a
balancing BMS....but the alarm & cutoff functions are critical....]
Jay
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