Supercapacitor Discharge Measurements 25F and 50F DUT-Sets

This repository publishes the raw discharge CSV logs and the derived figures from our supercapacitor characterization campaign. The analysis notebooks remain private; the published material captures the breadth of the measurement data. Table of Contents Linked References Experimental Setup and Methodology Dataset Structure Measurement Campaign Overview File Format Citation License Linked References 50 F Measurements (Validation Set): Dataset README & Discharge Curves - Eight Vishay 50 F devices tested at three current levels 25 F Measurements (Multi-Manufacturer Set): Dataset README & Discharge Curves - Six manufacturers, each with three 25 F devices tested at three current levels Experimental Setup and Methodology Sample Overview This study includes two distinct datasets of commercially available electric double-layer capacitors (EDLCs): Dataset 1 (50 F Validation Set): Eight 50 F, 3.0 V supercapacitors from Vishay, all from the same production batch, used to validate the voltage-dependent capacitance extraction method and quantify batch-level consistency. Dataset 2 (25 F Multi-Manufacturer Set): Eighteen 25 F supercapacitors representing six manufacturers (Eaton, Kyocera, Maxwell, Sech, Vishay, and Würth Elektronik), with three devices per manufacturer from the same batch. All devices are rated at 3.0 V except Würth Elektronik (2.7 V). All samples were stored in a climate-controlled environment at 21°C ± 2°C prior to testing to minimize thermal and aging effects. Test Equipment and Setup The laboratory setup follows IEC 62391-1 and IEC 62576 standardized test procedures for capacitance and equivalent series resistance (ESR) evaluation. The measurement system comprises: DC Power Supply - for constant-current charging and voltage holding phases Electronic Load - for constant-current discharge testing Data Acquisition System (PicoLog) - for precise voltage logging Custom Low-Impedance Test Fixture - with four-wire Kelvin connections to minimize parasitic effects and ensure accurate measurements Measurement Procedure Each measurement cycle follows the standardized three-phase IEC sequence: Constant-current charging (I_ch) - Device charged to rated voltage U_r Voltage holding - Maintained at U_r for 30 minutes to ensure charge stabilization (5 minutes for Methode 1B) Constant-current discharge (I_dch) - Discharged at constant current down to target voltage (typically 0.1 × U_r) All measurements were performed under controlled laboratory conditions with careful attention to IEC compliance. Test Conditions 50 F Dataset (Vishay): Method 1A Class 2 current: 0.06 A Method 1A Class 3 current: 0.60 A Method 1B Class 3-4-5: 3.41 A (95% efficiency criterion) Total: 24 discharge curves (8 DUTs × 3 currents) 25 F Dataset (Multi-Manufacturer): Method 1A Class 2: 0.03 A (0.027 A for Würth Elektronik) Method 1A Class 3: 0.30 A (0.27 A for Würth Elektronik) Method 1A Class 4: 3.0 A (2.7 A for Würth Elektronik) Total: 54 discharge curves (6 manufacturers × 3 DUTs × 3 currents) All DUTs were charged according to IEC specifications with 95% charge efficiency. Method 1B discharges were excluded from the multi-manufacturer set to ensure comparability, as these currents vary based on each device's rated ESR. Device Specifications Main characteristics of tested supercapacitors (from manufacturer datasheets): Manufacturer Dataset U_r (V) C_r (F) ESR_n (mΩ) Diameter (mm) Length (mm) Vishay 1 3.0 50 22 18.0 35.0 Vishay 2 3.0 25 34 16.0 25.0 Eaton 2 3.0 25 18 16.5 28.9 Kyocera 2 3.0 25 50 16.0 25.0 Maxwell 2 3.0 25 25 16.0 25.5 Sech 2 3.0 25 25 16.0 25.0 Würth Elektronik 2 2.7 25 25 16.0 25.0 Dataset Structure data/25F/ – CSV files for all 25 F devices under test (DUTs) data/50F/ – CSV files for all 50 F DUTs Measurement Campaign Overview 50 F DatasetEight Vishay DUTs (DUT1–DUT8), each recorded at three discharge currents (current levels are encoded in the filenames and headers). 25 F DatasetManufacturers: Eaton, Kyocera, Maxwell, Sech, Vishay, Würth Elektronik Three DUTs per manufacturer (DUT1–DUT3) Three discharge currents each 0.03 A, 0.30 A, 3.0 A for Eaton, Kyocera, Maxwell, Sech, Vishay 0.027 A, 0.27 A, 2.7 A for Würth Elektronik File Format Each CSV represents a single discharge curve with its corresponding header. Citation If you use these data or figures, please cite both the related paper and the Zenodo record: Paper: Paper: A Standard-Aligned Framework for Voltage-Dependent Supercapacitor Characterization DOI: https://doi.org/10.1109/OJIA.2026.3675690 Zenodo record: Supercapacitor Discharge Measurements 25F and 50F DUT-Sets License The data in this repository is licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0). You are free to use, share, and adapt the data, as long as you provide proper attribution. Disclaimer The data is provided "as is" without any warranties. Please see the LICENSE file for details.