Supercapacitor Discharge Measurements 25F and 50F DUT-Sets

Disclaimer / Usage Notice & Sample Overview This repository contains preview and supplementary materials associated with a scientific manuscript currently under peer review. Please read the following information carefully before using, distributing, or referencing any content provided here. Status: The materials provided in this repository are preliminary and intended exclusively for peer-review and evaluation purposes. Data Availability: The complete discharge datasets will be made publicly available after official acceptance of the associated manuscript. Preview Content: The repository currently includes discharge figures for review purposes. Viewing Figures Without Download Reviewers who wish to inspect figures without downloading any files may do so directly via the GitHub web interface. All images and preview materials can be viewed online by following this GitHub-link. 1. Status & Data Availability Current Status: All materials provided in this repository are preliminary and intended exclusively for peer review, evaluation, and supplementary inspection. Raw Data Publication Policy: The raw datasets will only be made publicly available after formal acceptance of the associated manuscript by the target journal. Current Content: This repository contains preview materials only. 2. Redistribution & Reuse The preview materials may be viewed and used for evaluation and review purposes only. Redistribution, reuse, or republication of the data, figures, or analysis workflows beyond this scope is not permitted while the data is under embargo (i.e., prior to manuscript acceptance and public release). For any intended reuse beyond review purposes, please contact the corresponding author. 3. No Warranty & Liability The materials are provided “as is”, without warranty of any kind, express or implied. The authors assume no liability for any direct or indirect damages arising from the use, interpretation, or application of the provided content. 4. Sample Overview This study comprises two independent datasets of commercially available electric double-layer capacitors (EDLCs), designed to investigate voltage-dependent capacitance behavior and manufacturer-level variability. Dataset 1 – 50 F Validation Set Devices: Eight (8) × 50 F, 3.0 V EDLCs Manufacturer: Vishay Batch: Single production batch Purpose: Validation of the voltage-dependent capacitance extraction methodology Assessment of batch-level consistency and repeatability Dataset 2 – 25 F Multi-Manufacturer Set Devices: Eighteen (18) × 25 F EDLCs Manufacturers: Eaton, Kyocera, Maxwell, Sech, Vishay, Würth Elektronik Samples: Three (3) devices per manufacturer, all from the same batch Rated Voltage: 3.0 V for all devices except Würth Elektronik (2.7 V) Purpose: Cross-manufacturer comparison of voltage-dependent capacitance behavior Evaluation of parameter consistency across production batches Storage Conditions All samples were stored in a climate-controlled laboratory environment at 21 °C ± 2 °C prior to testing in order to minimize thermal drift and aging-related effects. 5. Test Equipment and Measurement Setup All measurements were conducted in accordance with IEC 62391-1 and IEC 62576 standardized test procedures for capacitance and equivalent series resistance (ESR) characterization. The measurement system consisted of: DC Power Supply – for constant-current charging and voltage holding phases Electronic Load – for controlled constant-current discharges Data Acquisition System (PicoLog) – for high-resolution voltage logging Custom Low-Impedance Test Fixture – featuring four-wire Kelvin connections to minimize parasitic resistances and ensure accurate measurements 6. Measurement Procedure Each test cycle followed the standardized three-phase IEC sequence: Constant-current charging (I₍ch₎) Charging to the rated voltage U_r Voltage holding phase 30 minutes at U_r (IEC Method 1A) 5 minutes for Method 1B Constant-current discharge (I₍dch₎) Discharge at constant current down to a defined lower voltage threshold, typically 0.1 \times U_r All measurements were performed under controlled laboratory conditions with strict adherence to IEC compliance requirements. 7. Test Conditions and Dataset Composition 50 F Dataset (Vishay) Method 1A – Class 2: 0.06 A Method 1A – Class 3: 0.60 A Method 1B – Class 3–4–5: 3.41 A (95% efficiency criterion) Total: 24 discharge curves (8 devices × 3 current levels) 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 devices × 3 current levels) All devices were charged according to IEC specifications with a 95% charge efficiency criterion. Method 1B discharges were intentionally excluded from the multi-manufacturer dataset to ensure cross-device comparability, as Method 1B currents depend on each device’s rated ESR.