A BMS is therefore essential to avoid damaging the lithium batteries. When
the system is not in use, damage due to deep discharge can occur when
small loads ( such as alarm systems, relays, standby current of certain loads,
reverse current fl ow from chargers of battery or charge controllers) slowly
discharge the battery. If you are unsure of a residual current draw, discon-
nect the battery by opening the battery disconnect switch, removing the
fuse ( s) , or disconnecting the positive terminal on the battery when the
system is not in use.
A discharge current is particularly dangerous if the system has been com-
pletely discharged and shut down due to a low cell voltage. After a cut-off due
to a low cell voltage, a reserve capacity of approximately 5 Ah per 1 0 0 Ah of
battery capacity remains in the battery. The battery will be damaged if the re-
maining reserve capacity is removed from the battery. A residual current of
10mA, for example, can damage a 200Ah battery if the system is left in the dis-
charged state for a long period.
The
additional
functions
of
a
BMS
are:
Protection of the cell against undervoltage by cutting the load over time.
Protection of the cell against overvoltages by reducing the charging current
or by stopping the charging process.
System shutdown in case of overheating.
Battery charging is stopped at low temperature.
2
A LiFePO4 cell will fail if the voltage across the cell exceeds 3.65V.
3
The cells of LiFePO4 battery do not automatically compensate each other at
the end of the charge cycle.
ULTIMATRON FRANCE
10
Summary of Contents for SMART BMS Series
Page 1: ...lNSTRUCTlONS FOR USE SMART BMS SERlE 12 8V...
Page 2: ...ENGLlSH...
