Compact thermal modeling of Electric Double-Layer-Capacitors

Self-heating of electric double-layer-capacitors during charge and discharge current cycles has a strong influence on performance, reliability and safety. This paper presents a compact thermal modelling of electric double-layer-capacitors suitable for determining static and dynamic temperature under cycling, at any point of the active components, as a function of topology, materials properties, and operating conditions. Thermal circuits have been created by combining different branches of multi-ports matrix elements referring to each direction of heat transport. Circuits were developed by considering a uniform volume heat generation and, for each branch, a one-directional thermal transport. Performance of the modelling has been investigated in terms of accuracy and computational cost. Compact models were found in good agreement with simulations by the finite-elements method. Deviation did not exceed 8 %.