Download The battery can be connected directly to the DC supply of the

TEL
TEL is offering a range of 48 V batteries in 19 inch rack assembly housings for
for rack assembly which have the following advantages:
 better power performance than VRLA-Systems and therefor higher security of supply by higher
capacity.
 smaller volume and lower weight makes the use of smaller housings possible.
 save use for a long time due to many possible cycles.
 better security of supply by lower service life dependency on higher temperatures and shorter
recharge times.
So finally Lithium-ion-batteries have a much better economic viability than VLRA-Systems due to
the ability to have less aging versus temperature and provide in some circumstances up to 10
times more cycles than VRLA-batteries.
The battery can be connected directly to the DC supply of the telecom equipment. The
batteries are equipped with a high-end BMS-system (battery management system) which
measures:
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Total cell set voltage
Individual cell voltages
Temperature
Charge and Discharge Current
Discharge Operation
In the case of DC power is off, the discharge is controlled by a MOSFET so that the limits
maximum current, minimum and maximum cell voltage, minimum and maximum
temperature are never exceeded resp. fallen below. In case a parameter reaches its limit
the discharge is switched off.
Charge Operation
After the DC power returns, the charge is controlled by a MOSFET the BMS charges the
battery with a constant current-constant voltage regime (CCCV). During charging the BMS
balances the cells via the bypass path (Transistor and Resistor). The charge is stopped if
the first cell reaches the maximum cell voltage. The recharge is repeated under continuous
float conditions after the cell voltages drop to certain (programmable) value. In case that
the maximum cell temperature is exceeded the charge will be stopped and carried out
after the temperature falls back under the limit.
Visualisation
For visualisation the BMS controls 3 LED, green, red and yellow.
For visualisation of the operation modes the BMS has a LED bar to visualise battery empty
and SOC (state of charge) after pressing a reset button. As an option the batteries with 2
or more height units can be equipped with OLED-display to visualise voltages, currents,
temperatures and SOC.