FES BATTERY PACK GEN2 14S, Version 1.23 September 2019
Page 7 of 26
2.4 Internal BMS
FES GEN2 battery pack is equipped with BMS (Battery Management System)
electronic circuit.
How BMS works?
BMS electronic measure and control voltage level of each cell in the battery pack.
During charging and discharging, battery cells differ in voltage levels, due to slightly different
capacity of the cells. Cells with lower capacity become fully charged faster than cells with
higher capacity. Those cells which reach maximum preset voltage earlier than the others,
are discharged through resistors inside of BMS
–
the energy dissipates through heating of
the upper cover plate, which is milled from Aluminum, and black anodized. To improve
dissipation of the heat there are two small ventilators on top of the upper plate which starts
running when upper
plate reach preset temperature (50°C)
Balancing of each cell is indicated by green light emitting diode (LED).
Note:
BMS starts balancing cells only during charging, and above pre-set
balancing start voltage (4.10V)
BMS DATA AND INITIAL SETTINGS
Parameter
Value
Unit
Maximum charging current**
9,18 or 35
A
Maximum balancing current
1
A
Single cell end of charge voltage*
4.16
V
Single cell balance voltage start*
4.10
V
Single cell balance voltage end*
4.16
V
Single cell under-voltage protection*
3.1
V
Single cell over-voltage protection*
4.18
V
Cooling fans start temperature*
50
°C
Max BMS temperature*
55
°C
*Initial settings may be changed with BMS Control software.
**Max charging current depends on type of charger.
