3550 Battery HiTESTER Series
28
Fig. 5: Change characteristics of the
internal resistance in a Ni-MH battery
while recharging
(Discharge current: 950mA)
Fig. 6: Change characteristics of the
internal resistance in a Lithium Ion battery
while recharging
(Discharge current: 800mA)
Fig. 7: Temperature characteristics of the
internal resistance in a Ni-cd battery.
4.2 Temperature Characteristics of the Internal Resistance in Secondary
Batteries
A battery's performance depends on the temperature of the environment in which it is used. It
is reported that at low temperatures the amount of output current decreases, and at high
temperatures the operational life of the battery is reduced.
3
Then, after charging a variety of
batteries (Ni-cd, Ni-MH, and lithium ion) fully, we measured their internal resistance and terminal
voltage while changing the ambient temperature from -10°C to +40°C. Figs. 7, 8, and 9 show
the measured results for each of the batteries. While the change in terminal voltage was small
for all of the batteries, we observed that as the temperature increased, the internal resistance of
the Ni-cd and Ni-MH batteries decreased. On the other hand, the change in the internal
resistance of the lithium ion battery was small. This means that although the performance of
Ni-cd and Ni-MH batteries suffers at low temperatures since the amount of current that they can
output is limited, a lithium ion battery can output a stable amount of current even at low
temperatures.
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