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This method cannot be run with a VoltaLab 40 or VoltaLab 10.
Files:
Battery discharge test .EXP
Battery discharge test (Append) 00g.CRV
Battery discharge test (Extract) 00R.CRV
Abstract
A galvanostatic discharge of a battery is performed
with a differential pulse measurement every 15 sec. The pulse duration
is 10 ms. The differential measurement is proportional to the internal
resistance of the battery.
Sample
Saline battery. Positive pole connected as working
electrode. Auxiliary electrode short circuited with the counter
electrode.
Settings - Experimental
E OUT connected to A/D IN
The sequence consists of the repetition
of this method (which lasts 10 min). The repetition of the method
is repeated several times without opening the circuitry.
Curve examination
1) Battery
discharge test (Append) 00g.CRV
Display: Type = Normal X = Time Y1 = Potential diff. Y2 = Potential
This curve corresponds to the append of
every Gal. Differential "differential pulse curves" generated during
the experiment. One curve is generated per method. The append function
handle the time so that the curves are saved upon the same real
time scale. The decay in voltage corresponds to the increase of
the differential measurement which is proportional to the internal
resistance of the cell.
2) Battery
discharge test (Extract) 00R.CRV
Display: Type = Normal X = Time Y1 = Potential Y2 = Current
This curve shows the first
50 seconds of the discharge with, every 15 seconds, the pulse used
for the determination of the internal resistance of the battery.
Conclusion
The connection of the E output on the A/D
IN input gives the possibility to show on the save figure the discharge
of the battery on Y2 and the differential potential which represent
the image of the internal resistance of the battery.
The Gal. Recurrent DP method can also be used to generate several
recurrent pulses.
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