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 https://doi.org/10.1016/j.jpowsour.2023.233677 . 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松下NCR18650B电芯的电芯间差异 本数据集包含92支全新松下NCR18650B电芯的原始表征数据。本次测试的相关信息可部分参考本自述文件，详细细节可查阅文献https://doi.org/10.1016/j.jpowsour.2023.233677。本数据集涵盖脉冲测试、伪开路测试以及阻抗测试三类数据，所有测试均在Binder MK 155型恒温箱中于25℃条件下完成。 伪开路电压测试 伪开路电压（Pseudo Open Circuit Voltage, POCV）测试采用0.05C恒定电流分别沿充放电方向进行，测试设备为Arbin LBT 5V-25A型电芯测试仪。数据以Matlab结构体形式存储，包含以下字段： - pocv.ch：充电过程中的伪开路电压 - pocv.dc：放电过程中的伪开路电压 - pocv.soc：伪开路电压曲线对应的荷电状态（State of Charge, SoC） 所有伪开路电压数据均被插值至5000个等间距的SOC点，并按SOC向量方向完成排序。 阻抗测试 阻抗测试在静置4小时后，于50%荷电状态（以实测的C/20放电容量为基准）下开展。测试设备为Zahner Zenium Pro型光谱仪，测试电流幅值为250 mA，测试频率范围为0.01 Hz至10 kHz，每十倍频程设置10个测试点。数据以Matlab结构体形式存储，包含以下字段： - impedance.f：测试频率，单位为Hz - impedance.Z_imag：阻抗虚部，单位为欧姆（Ω） - impedance.Z_real：阻抗实部，单位为欧姆（Ω） - impedance.Z：复阻抗，单位为欧姆（Ω） 每一行对应单支电芯的测试数据集，每一列对应一个测试频率，该规则同样适用于.csv格式文件。 脉冲测试 脉冲测试在静置2小时后，于50%荷电状态（以实测的C/20放电容量为基准）下开展，测试设备为Arbin LBT 5V-25A型电芯测试仪。测试流程为：以0.5C电流施加10秒，随后静置30分钟，测试顺序为先充电脉冲、后放电脉冲。数据以Matlab结构体形式存储，包含以下字段： - pulse.neg_time：放电脉冲序列对应的时间 - pulse.neg_voltage：放电脉冲序列对应的电压 - pulse.pos_time：充电脉冲序列对应的时间 - pulse.pos_voltage：充电脉冲序列对应的电压