Temperature Effect On Battery Capacity
Figure 3-1 describes temperature effect on battery capacity (C
10
). For example, if temperature falls
from 25
℃
to 0
℃
, battery capacity will be 85% of the nominal capacity, low temperature will cause
long term charge shortage, negative plate will be irreversibly sulfated and as a result the battery
cannot be used normally. If discharge temperature is not 25
℃
, the capacity can be converted to
C
25
℃
according to the following formula.
In the formula:
T---Discharge temperature
C
T
---Capacity at temperature of T
k---Temperature coefficient;
k=0.006/
℃
at C10 discharge;
k=0.008/
℃
at C3 discharge;
k=0.01/
℃
at C1 discharge.
As temperature rises, battery capacity will increase to a certain point. For example, if temperature
rises from 25
℃
to 35
℃
, capacity will be approximately 105% of the nominal capacity. From 35
℃
to 45
℃
, the capacity increase is very low and if temperature rises beyond 45
℃
, there is no
increase in battery capacity.
Figure 3-1 DCS series temperature effect on battery capacity curve
Operati
on
and
m
aintenanc
e
9
