Latest research publication: Supercapacitor Capacity and Circuit Analysis

The EMPHASIS project, in cooperation with MetSuperCap consortium, published a new paper.

The capacity of a supercapacitor (SC) is not constant but varies with the charging voltage and the charging time. The standards (e.g. EN IEC 62391) propose conventional methods for calculating the capacity, usually after a 30 minutes charging and a constant current discharging. This conventional value is considered constant.

Actually, a good electrical representation of a SC must include a small network with two or more branches, otherwise the calculation of the charging, discharging and cycles is only approximate.

In the paper a method is proposed to combine the repeatability of a trained SC, the measurement accuracy of voltage and current and obtain an evaluation of the uncertainty of the equivalent circuit parameters. The method is general, even if in the paper it is applied to a three-branch equivalent circuit.

Find the paper here.