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.