Has anyone had a good look at the operation of the Leaf BMS.
Circuit is very different, and so is the operation. First thing I
noticed when I got leafspy was that the BMS works ALL the time, not just
above a certain voltage. Leafspy also shows it working on the lowest
cells, so it's not just a shunt? the circuit shows inductors in series
with all measuring wires to the batteries, both sides of each cell.
These points are then coupled together by capacitors, the whole pack.
My thinking is that this could be energy transfer path between any
cells and multiple at the same time. This count be done via half bridge
inverters on each of the wires. I have searched, but find nothing, apart
from some comments that it is a small surface mount resistor that is the
shunt, and only 7.5 mA. That would actually do nothing for a 60ah battery.
On 14-Aug-19 3:06 PM, Mr. Sharkey via EV wrote:
>> A URL or name for this company would be appreciated.
Try this, although it seems some of the products are
discontinued/out-of-stock:
https://evparts.com.au/ev-power-bms.html
>> Let me know once you have a few extra to sell.
This will likely be a fall/winter project, once the year's firewood is
put up and the outdoor chores cease due to the weather.
Another part of the repower project is going to be to rework a Todd
Power Source to be a lithium-compatible 36v charger. I'll probably run
barefoot without a BMS in the short term and carefully balance and
charge manually until I get something worked out.
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