Cell characteristics for 46Ah High Power Kokam Nano Pouch Cell

A 46Ah cell was characterised by Electrochemical Impedance Spectroscopy (EIS) for parameterisation of a R-RC-RC equivalent circuit model. Samples were measured for all combinations of temperature (0, 10, 20, 30, 40°C) and state of charge (SOC) (0, 10, 20, …, 90, 100%). The raw data was analysed by the Matlab extension DRTools to identify the most dominant time constants. Using both biggest and smallest time constant one parameter set (R1/C1, R2/C2) was calculated. In addition, interpolating the zero-crossing point of the imaginary impedance give the parameter R. SciPy's optimiser "L-BFGS-B" was then used with the DRT data as initial guess to fit the model onto the data. For this, the Euclidean distance between model impedance and measured impedance in the Nyquist plot was minimised. Due to the limitations of the model used, measurement points with positive imaginary impedances were not considered during the fitting process.

The cell was characterised by galvanostatic EIS measurement in the frequency range [10mHz to 100MHz] with a current of 1A. Per decade ten measurements were logarithmically distributed.

Update (V2):
Extension of the dataset by the corresponding open circuit voltage (OCV) for each SOC at 20°C. The data were obtained as pseudo-OCV by cycling the cell at a low current rate of C/20 (2,3 A). By averaging charge and discharge characteristic the given universal characteristic was determined.

This dataset was created during a study on detection possibilities of cell faults thankfully funded by the European Automobile Manufacturers' Association (ACEA).

搜集汇总

背景与挑战

背景概述

该数据集包含46Ah高功率Kokam Nano Pouch Cell的电池特性数据，通过电化学阻抗谱（EIS）在宽温度（0-40°C）和充电状态（0-100%）范围内测量，用于参数化R-RC-RC等效电路模型以支持电池故障检测研究；更新版本还提供了20°C下的开路电压数据，通过低电流循环实验获得。数据集由欧洲汽车制造商协会资助创建，适用于电池建模和性能分析。