Renata SA 3V Lithium Coin Cells - DESIGNER'S GUIDE - Manual (Page 55)

55
the swiss power source
UL safety tests
Safety Guidelines
54
Heating Tests
The power modules were heated in an oven. The
temperature on the exterior surface of the module
casing was measured by means of an iron-
constantan thermocouple. The heating rate was
controlled with a variable transformer and ranged
from 1°C/min. to 11°C / min. The heating was
discontinued at 180°C (356°F). The modules
were examined after the test for any signs of
change.
The following modules were used in these tests:
Previous conditioning of modules No. of 1000-2 cells No. of 500-1 cells
Fresh modules 3 2
After oven exposure 2 3
After temperature cycling 3 2
Cells discharged at room temperature:
Completely discharged 2 3
One-half discharged 3 2
Cells discharged at 71°C (160°F)
Completely discharged 2 3
One-half discharged 3 2
There were no fires or explosions at
temperatures below 165°C (329°F). There were
no indications of increased reactivity as a result of
exposure in the conditioning tests.
Results
Puncture and Leaking Test
Cells were punctured by cutting through the cell
casing with a small grinding wheel until liquid or
gas was released from the cell.
The cells were found to contain only a
few drops of an organic liquid. The cells were not
pressurized and no gas, liquid or solid particles
were sprayed from the cells.
Results
Short Circuit Test
The cells were shorted by connecting the positive
and negative terminals with a short length of
copper wire. The temperature on the exterior
surface of the metal cell casing was monitored
during the test by means of an iron-constantan
thermocouple.
Short circuit tests were conducted on cells at
room temperature. After the tests, the cells were
examined for any signs of change.
The following cells were used in these tests:
Model CR2450N
Previous conditioning Number of cells
of cells at room temperature
Fresh cells 5
There were no signs of case bulging,
leaking, or any other visible changes as a result of
these tests. The maximum temperature measured
on the exterior surface of the metal cell casings
was 30°C (86°F) for the tests conducted at room
temperature. The maximum temperatures were
obtained in tests with fresh cells.
Results