7
8
5. Supplementary Charging
Due to self discharge, battery stocked long time, the
capacity reduce slowly, the relationship between
capacity reservation, temperature and stock time as
right curves. Supplementary Charging adopts the
constant voltage but limited current method. Initial
charging current is 0.05C10
0.1C10, charging
voltage is 2.35 2.4V/Cell, generally charge for 36
hours. After longtime storage, before use, battery
should be makeup charged.
-
-
7. Float Life Characteristic
At recommended float charging situation at 25
, FC series battery design life is over 8 years. Battery's
usage lifetime is related with ambient temperature, depth
of discharge, discharge rate and float charging
voltage. In real usage, depth of discharge, frequent of discharge, incorrect float charging voltage will
effect the battery lifetime directly. Float Life characteristic curves are as below:
℃
Discharge Capacity vs Temperature
Battery discharge capacity is related
with temperature.
Lower
temperature,
lower
capacity discharged;
higher temperature , higher capacity discharged . But the too high temperature will seriously damage the battery
life time. The best working temperature for battery is 20
- 25
. The discharged capacity
at
d i f f e r e n t
temperature Ct vs Discharged capacity at 25
,C25 have below relationship:
℃
℃
℃
The operating record of fixed batteries is very important for battery maintenance and protection. This
information is useful for user to confirm battery life and adjust the longevity. Battery is allowed to operate at
a temperature lower than 2 5
, however, the charging time will be relatively long. After installing batteries
and a week of float charge, it's required to record the following information:
1 Battery terminal voltage
2 Charger voltage
3) Float charging voltage of
each battery
4 Internal resistance of each battery. Within the same battery,put the meter that tests internal resistance
at the two terminals that is in farthest diagonal position.
5 Environment temperature
6)Check if all the connecting points have been fixed to the proper torque
.Use a milliohmmeter
to test internal resistance of each connecting strip. Conduct the test according to the probe potion on
the instructionmanual . If the data range is 20 % bigger than that d u r i n g i n s t a l l a t i o n , f i x s c r e w s
again to the torque of 11.3N.M. If the data remains high, please wipe terminals and the interface between
terminals and connecting strips.
℃
(
)
)
)
)
)
11.3N.M
Storage Time
Month
(
)
Charge Voltage V Cell
( /
)
Maximum Charge Current A
( )
Charge Time Hr
( )
3
~
6
6
~
12
12
~
20
2.35
2.40
2.40
0.2C
10
0.2C
10
0.2C
10
36
48
60
Storage Time vs Charge Voltage and Charge Time
5. Supplementary Charging
Due to self discharge, battery stocked long time, the
capacity reduce slowly, the relationship between
capacity reservation, temperature and stock time as
right curves. Supplementary Charging adopts the
constant voltage but limited current method. Initial
charging current is 0.05C10
0.1C10, charging
voltage is 2.35 2.4V/Cell, generally charge for 36
hours. After longtime storage, before use, battery
should be makeup charged.
-
-
6. Discharge Characteristic
Discharge rate is different, the cutoff voltage also different.
Higher discharge current, lower cutoff voltage; reversely,
lower discharge current , higher cutoff voltage. Normally the
battery cutoff voltage set at
1.8V 1.6V. The discharged
capacity is lower with higher discharge current.
Discharge characteristic curves are as right:
-
C25
Discharged capacity at 25
(AH)
Ct
Discharged capacity at t
(AH)
t
Environment temperature during discharge (
)
K
Temperature compensation coefficient
10Hr rate discharge
K=0.006/
5Hr rate discharge
K=0.007/
3Hr rate discharge
K=0.008/
1Hr rate discharge
K=0.010/
℃
℃
℃
：
℃；
：
℃
：
℃；
：
℃
Temperature vs Capacity Curve
120
110
100
80
60
40
0 -40
-30
-20
-10
-0
10
20
30
40
50
Temperature
（℃）
Ef
fective
Capacity
(%)
Temperature vs Capacity Curves as below:
Float Lifetime vs Temperature
According to Arrhenius equation , battery design life
fluctuated with temperature, temperature increased
every 10 degree, the float lifetime cut half.
K1 Equal constant at T1 temperature
K2 1
Equal constant at T2 temperature
Ea: activation energy
R: air constant, 8.3143 J·mole·K-1
T1: environment temperature at during discharge, K
T2: standard temperature 293K
:
: （
）
Float Life Characteristic Curves
20
30
40
50 C
68
86
104
122 F
Temperature
1
0
8
6
7
5
4
2
3
1
0
Life
Y
ear
()
Float Charge Voltage: 2.30V/Cell
9
10
Operating Record
Operating Record
0 05C A
.
10
0 1C A
.
10
0 165C A
.
10
