|
Test
Results for Kokam SLPB 60460330 and Kokam SLPB 100216216 cells at
10C
|
Warning
|
A
constant 10 C discharge is not recommended by Kokam!
This was for our test purposes and could damage the battery.
Kokam recommends 5 C continuously, 10 C peak.
|
Below
are links to three text files. These are the raw data files from
testing a Kokam cell on the ProEV's Battery Evaluator.
The Battery Evaluator charges the cell from a battery bank and discharges
the cell through resistors. The software reads through a Labjack
U12 DAQ board (www.labjack.com)
and it's readings were calibrated to an E-meter. There is some room
for error in the calibration and there are major fluctuations in
the amp discharge rate due to some quick and dirty control software
writing. It was accurate enough for our test purposes.
For
these tests we used the following charge algorithm.
The cell is charged at constant current at 1 C (40 amps and 70 amps
respectively). When the voltage reaches 4.235 (The manufacture suggest
4.200 as a better cut off voltage), the charge changes to constant
voltage until the average current drops to .1 C for a certain amount
of time.
The
data headers are:
| |
Voltage
(V)
|
battery
Temperature
(C)
|
Current
(Amps)
|
Amp/Hrs.
|
<ignore>
|
Time
(Seconds)
|
| example: |
4.243
|
28.608
|
73.086
|
0.035
|
0.150
|
2.600
|
|
test
#
|
description
|
|
|
This
is a test of the 40 amp/hr battery. |
|
|
This
is the first test of the 70 amp/hr battery. One side was insulated
by a foam container. The discharge was aborted when the temperature
reached the manufacture specified maximum temperature of 60
degrees C. The control software is pretty bad and spends half
the time closer to 600 amps than 700 amps. |
|
|
This
is the second test of the 70 amp/hr battery. The battery is
resting on two blocks of wood so there is air flow on both sides.
It is getting some cooling from a fan cooling the Battery Evaluator.
The control software has been improved and holds the amps closer
to 700. |
| |
|
|
