1.What is the common port and separate port?
what is the difference? We take 13S48V15A BMS as an
example, common port 15A means your charge cathode
and discharge cathode are connected in the same point
end(our P-), charge cathode and discharge cathode are
used in the common connection port, so the charge
current and discharge current are the same 15A. while
the separate port is separately connected by charge
cathode (C-) and discharge cathode (P-), so the
charge current and discharge current are different,
discharge current 15A, charge current 8A. 2.What is
the balance function? The working principle and
function are as followings, when your one cell
voltage is upto alarm voltage(Li-ion upto 4.18V, Life
Po4 upto (3.6V), then the cell Balance starts to
work, balance resistance starts discharge with
30ma(when balance discharge starts to work, BMS will
starts a little heat up, which is the normal
reflection), the cell is in both charging and
discharging status, and others which are not reached
to alarm voltage(Li-ion 4.18V, Life Po43.6V)are only
in charging status, no discharging, when the fast
cell voltage is reached to alarm voltage (Li-ion
4.25V, Life Po43.75V)BMS starts off power protection,
all the other cells are all in stop of charging, this
process will enable your battery charging in balance
current, and your battery voltage are in balance
status, but when your cell voltage difference are in
a big range, then balance can not be functionning.
well 3.The relationship between Battery capacity and
BMS current? There is no direct relationship between
Battery capacity and BMS current, big capacity
doesn`t mean a big battery, but rely on continue
current, that is to say if your engine is powerful,
your should choose high current of BMS, it is not
relied on battery capacity. 4. What type of charger
should I choose? Lithium battery must choose specific
charger, do not use Charger for Leadacid battery, for
leadacid charger may have MOS with high pressure
breakdown protection, which will not protect of BMS
over charge. Life Po4 battery charger voltage=battery
string No.X3.6V, while Li-ion battery charger
voltage=Battery string No.X4.2V. 5. What current BMS
should I choose ? Take 10S36V as an example: what
current BMS you choose is relied on your E-bicycle
Motor power and current limitation of controller.
eg., choose 15A for below 350W, 20A for below500W,
30A for below 800W, 60A for Below 1000W, higher than
1200W are contact with our service specialist for
suggestions, one inall, continue current shall be
higher than current limitation in Controller. 6.
Whether my BMS damaged? if you want to judge if the
BMS is damaged, please take the folowing steps, to
test if each cell voltage is the same with voltmeter?
if the cell voltage difference is over 1.0V, the
fault is displayed that it cannot run far, no power
supply at the start range, short charge time, all
these issues are almost caused by battery cells, if
BMS damaged is displyed as no charge, no discharge,
no discharge while the battery has
voltage.
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