BMS Basic Features
All Battle Born Batteries come with a built-in battery management system (BMS) that protects
the cells for long-term cycling. The BMS protects against the following conditions:
High voltage: > 14.7V
If an individual cell voltage exceeds a prescribed threshold during charging, the BMS will
prevent a charge current from continuing. Discharge is always allowed under this condition.
Low voltage: < 10V
If an individual cell falls below a prescribed threshold during discharge, the BMS will prevent
further discharge. Although the battery is in “low
-voltage disconnect
” mode, it will still allow a
charging current. (Note: many chargers must detect a voltage over 10v to send a charge to the
battery).
High temperature: > 135F
The BMS will not allow a charging or discharging current.
Low temperature: < 25F
The BMS will not allow a charging current.
High Current
The BMS will not allow a current that exceeds 100 (+/- 5%) Amps for 30s, or 200 (+/- 10%) Amps for 0.5s.
Although these thresholds have been verified with a DC load bank, the 30 second high current threshold
may be reduced from 200A to around 150A for certain highly variable loads through an inverter
–
like a
microwave or space heater. After a high current disconnection, the battery will automatically reconnect
after 5 seconds.
A passive balancing process is activated by the BMS at the top of each charge cycle, when the
battery voltage exceeds around 14V. This ensures that all the cells remain at the same state of
charge, which helps for pack longevity and performance.
IEC 62133 certification mandates that charging has been certified between 37F and 113F (3C
and 45C).