Cor van de Water via EV wrote:
There may be reasons to have a large balancing current, but they escape
me.
1. To deal with cheap old mismatched cells.
2. To allow you to replace one cell without replacing the whole pack.
The new cell is likely to be significantly different than the rest.
3. To stop a cheap, stupid, or non-networked charger that hasn't cut
back its current from overcharging cells.
4. So it can balance faster, as when commissioning a new pack with
cells that arrive at different states of charge.
5. To be able to balance *while driving*. If you top-balance and the
cells have different amphour capacities, they will go dead at
different times. If the BMS can transfer charge from stronger
cells to weaker ones, then you can increase the effective capacity
of the pack, and thus your range.
That said... I don't think this particular BMS can do any of these
things. It does not appear to have any way to deal with the heat
produced by many cells bypassing at 1.5 amps, nor to be able to transfer
charge between cells rather than just burning it up as heat.
--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint Exupery
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com/balancer.htm
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