Therefore, long time storage batteries need recharge in order to recuperate the
discharged capacity. The requirement of interval is below for recharging battery under
different temperature.
Storage temperature
Longest interval
over 30
once 4 months
under 30
once 6 months
The recharging interval is shorter, battery capacity is more renewed, the recharging
time is shorter, and there is less effects on battery life. If the recharging interval exceeds
the prescriptive time, the batteries should be cycled with charge and discharge for at least
once time.
3 Battery Recharging Method
3.1 Recharging Parameter
We use equalizing charge to recharge the batteries, the parameter is as below:
a) Charging mode: equalizing charge;
b) Charging voltage: (2.35±0.02)V/cell, for -48V system, charging voltage is 56.4V;
Charging voltage (made up with 12V monobloc) = 2.35 × 6 × battery quantity
Charging voltage (made up with 2V monobloc) = 2.35 × battery quantity
c) Current limited: 0.05C
10
(A);
d) Cut-off condition: the time first between charging current is less than 0.005C
10
with another extended 3 hours or charging time reached 16 hours;
3.2 Recharging Procedure
1. Connect the batteries in series with cables or copper bars, and make sure that all the
screws tightened with each joint, then connect the anode of battery group to the
anode of charging equipment (charger), and the cathode of battery group to the
cathode of charger. Pay attention, a breaker or fuse should be connected in the circuit
in order to protect the batteries and charger, the capacity of breaker or fuse should be
1.5 times of circuit maximum current.
2. Turn on the charger, set the charging voltage and current according to 3.1
Recharging Parameter.
