Cell-to-Cell-Variations of a Panasonic NCR18650B

Cell-to-Cell-Variations of Panasonic NCR18650B 

This dataset contains raw characterization data from 92 Panasonic NCR-18650B cells at the beginn of life. Information on the measurements performed can be taken in part from this readme file. Further details can be found in doi:\\ . Pulse measurements, pseudo-open circuit measurements, and impedance measurements are recorded. All measurements are performed in a Binder MK 155 climate chamber at 25°C.

Pseudo Open Circuit Voltage

POCV is recorded with a constant current of 0.05C in the charge and discharge direction. The measurements are performed with an Arbin LBT 5V-25A cell tester. The data is stored as a Matlab struct containing the following entries:

pocv.ch  % POCV of during charging
pocv.dc  % POCV of during discharging
pocv.soc % SoC of the pocv curves

The POCVs are interpolated to 5000 equidistant SOC points and sorted in the direction of the SOC vector.

Impedance

Impedance measurements are at 50% SOC(actual measured discharge C/20 capacity as reference) after 4h of relaxation. The measurements are conducted with a Zahner Zenium Pro spectroscope with an amplitude of 250 mA in a frequency range between 0.01 Hz and 10 kHz with 10 steps per decade. The data is stored as a Matlab struct containing the following entries:

impedance.f      % Frequency in Hz
impedance.Z_imag % Imaginary Part of the impedance in Ohm
impedance.Z_real % Real part of the impedance in Ohm
impedance.Z      % Complex valued impedance in Ohm

Each row corresponds to a dataset of an individual cell and each column corresponds to a measurement frequency. The same applies to the .csv files.

Pulse Test

Pulse measurements are performed at 50% SOC (actual measured discharge C/20 capacity as reference) after 2h of relaxation. The measurements are performed with an Arbin LBT 5V-25A cell tester. The pulse test is performed with a current of 0.5C for 10s followed by a relaxation of 30 minutes. The discharge pulse follows the charge pulse. The data is stored as a Matlab struct containing the following entries:

pulse.neg_time    % Time of the discharge pulse sequence 
pulse.neg_voltage % Voltage of the discharge pulse sequence
pulse.pos_time    % Time of the charge pulse sequence
pulse.pos_voltage % Voltage of the charge pulse sequence