Renata SA 3V Lithium Coin Cells - DESIGNER'S GUIDE - Manual (Page 43)

43
the swiss power source
42
General electrical performance
Frequently Asked Questions (FAQ)
What is the maximum pulse current the
lithium coin cells can handle?
There are no specified limits for the peak current
value in pulse applications. Instead, current limits
can be defined by means of a series of factors
and practical considerations related to the
electrical application, like the load profile, the
cut-off voltage and the targeted service-life of the
cell in the application. Electrical applications are
normally regulated by a voltage threshold (cut-off
voltage), under which the applications miss the
required electric energy to work and therefore will
shut-down. The cell is the energy/voltage source
in the application; when the voltage during a
pulse is lower than the cut-off voltage, the
application will shut down. A proper design of the
electrical application in terms of electrical load
and cut-off voltage, combined with the choice of the cell of right energy and power characteristics,
are of paramount importance in order to achieve
the targeted service-life of the application. The
mutual relation that links application characteris -
tics, cell performances and targeted application
services is graphically illustrated below.
Consult Renata experts in order to calculate and
select the cell with the right characteristics for
your application and achieve your goal!
What is the shortest time period for
testing the behaviour of batteries?
It is common to perform accelerated tests to
prove the lifetime of the battery in the application
or to test the performance of different batteries.
According to IEC 60086-1 it is recommended to
discharge the battery for a period of approx.
30 days. With the standard discharge current
given on page 7 of this Designer's Guide one
achieves 100% of the nominal capacity within
these 30 days.
However, also expedited test are possible when
the resulting capacity decrease is taken into
consideration. The limit of the average discharge
current is the max. continuous discharge current
given and explained on page 7. It is not
recommended to perform tests with currents
beyond this limit because the results may not be
typical or they could be misleading. Li/MnO
2
batteries are designed to supply low currents for
several years. Therefore, test results are rather
random when discharging the batteries in very
short time periods with high currents.
Application proper design
Application load
profile and
cut-off voltage
Temperature range
and minimum
operating
temperature
Lithium cell
energy and
power
Application
service life