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1 Quick Reference
Self-Discharge Measurement Criteria
To quickly measure the self-discharge behavior of a Lithium ion cell requires characterizing a number
of test parameters, and verifying that their effect will result in a valid self-discharge measurement.
The following inequality describes the parameter constraints that must be satisfied for a valid self-
discharge measurement, one that results in a voltage value between 0.5 V and 4.5 V.
0.5V ≤ V
+ I*(6.2Ω + R
CELL
where
is the open circuit voltage of the cell. This can be provided by the user, or measured with the
V
CELL
Keysight BT2152A.
I is the instantaneous current obtained during the self-discharge test. This is the Keysight BT2152A's
current measurement value. The inequality constraints must be satisfied for all measured current
results, both positive and negative. This includes the initial current, final settled current value, and any
transients that may occur. Note that the current measurement range for the unit is ±10 mA; however,
the resultant value should be positive and much lower than 10 mA -- usually in the 10 to 100
microampere range.
is the resistance of the total cable wiring from the Keysight BT2152A to the cell under test.
R
CABLES
This can be provided by the user through external measurements, or it can be calibrated directly by
the Keysight BT2152A's
the
SENSe:WIRE:RESistance:CONFigure
is cell's internal equivalent series resistance. This can be provided by the user if necessary by
R
ESR
adding it to the resistance of the total cabling wiring from the Keysight BT2152A to the cell under test,
using the
SENSe:WIRE:RESistance:CONFigure
<res> is the user-selected output resistance from 0.1 Ω to 10 Ω. This is the same value entered using
the
INITiate:TEST:MATChed
External Temperature Measurement
The external temperature sensor input on the rear panel requires an external 10 kΩ thermistor.
Measurement Input
Thermistor Requirements:
Temperature measurement range:
Temperature measurement uncertainty:
Maximum total lead resistance allowed:
16
+ R
CABLES
CALibration:WIRE:RESistance:AUTO
command.
command. Typically this value is less than 10 mΩ.
command.
- <res>) ≤ 4.5V
ESR
command. It can also be modified using
Characteristic
Negative Temperature coefficient (NTC)
10 kΩ Nominal Resistance at 25°C
Programmable Beta value (4073 default)
5°C to 100°C
± 1.5°C
10 Ω
Keysight BT2152A Operating and Service Guide
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