1.What is the common port and separate port? what is the difference?
13S48V50A BMS for example, common port means charging cathode and discharging cathode are connected in the same point end(our PC-), so the charge current and discharge current are the same. Meanwhile separate port BMS is separately connected by charge cathode (PC-) and discharge cathode (P-), so charge current and discharge current are different, discharge current 50A, charge current 8A-10A is fine.
2.What is the balance function?
Balance can be divided into Non-dissipating and Dissipating balance
Dissipating Balance is so-called passive balance, which happens during charging. It's consuming the high voltage cell energy by dissipating through a resistor in heat.
Non-dissipating Balance is Active balance, which works by transferring energy from high voltage cell to low voltage cell.
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 higher current which actually is decided by Load like motor, driver. Too big capacity might disable the short circuit protection of a small current BMS.
4. What type of charger should I choose?
Lithium battery must choose specific charger, do not use Charger for Lead acid battery, for leadacid charger may have MOS with high pressure breakdown protection. LifePo4 battery charger voltage=battery string No. into 3.6V, while Li-ion battery charger voltage=Battery string No. into 4.2V.
5.What current BMS should I choose ?
Take 10S36V for example: BMS current depends on E-bicycle Motor power and current limitation of controller.
Choose 15A for below 350W, 25A for below 500W, 35A for below 800W, 60A for Below 1000W, higher than 1200W motors could be advised by our salesperson. One in all, continuous current shall be higher than current limitation in Controller.
6. Whether my BMS damaged?
To judge if the BMS damaged, please take the following steps:
test with voltmeter if each cell voltage is same. If the cell voltage difference is over 1.0V, BMS might be damaged or Connection is wrong.
Short mile coverage, no power supply at the start range, short charge time, all these issues are almost caused by battery cells. If BMS damaged, Battery can not be charged, or discharged while the battery has voltage.
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