Commissioning
Manual_Grid_Power_FNC_en_V3_0
35
9.1.2.
Charging with Constant Current and Constant Voltage (CCCV)
ATTENTION!
The CCCV charging must not be used for unfilled and uncharged (UU) FNC
®
cells.
As an option, you can use the constant current, constant voltage charging method for initial
commissioning of the battery system. This method takes longer to charge the battery
system to approximately 100 % than the constant current charging
on page 33)
.
First, the grid|power FNC
®
cells are charged with a constant charging current. The
maximum current has to be limited to
≤ I
5
(e.g. for a 100 Ah battery the current I
5
= 20 A).
As soon as the voltage limitation takes place, the charging current decreases automatically.
The following table shows the specified charging time for charging with limited charging
voltage:
Voltage [V] Time
[h]
Current
[A]
Capacity
[Ah]
Description
1.9 V / cell
7.5
I
5
1.5 * C
n
This is the recommended charging method,
see
9.1.1 Charging with Constant Current
on page 34
15
I
10
-
1.85 V /cell
10.5
I
5
If you limit the charging voltage, the
charging time must be extended. Every
step of 0.5 V increases the charging time by
3 hours if the charging current is I
5
.
Note
Initial commissioning is only possible with
charging voltages
≥ 1.65 V to get the
capacity of the battery system to
approximately 100 %.
21
I
10
1.8 V /cell
13.5
I
5
27
I
10
1.75 V /cell
16.5
I
5
33
I
10
1.7 V /cell
19.5
I
5
39
I
10
1.65 V /cell
22.5
I
5
45
I
10
Charging time [h]
Charging current
Charging voltage
