Modeling of a Lithium-Ion Capacitor and Its Charging and Discharging Circuit in a Model-Based Design

Abstract

For several years now, electric vehicles (EVs) have been expected to become widely available in the micro-mobility field. However, the insufficiency of such vehicles' battery-charging and discharging performance has limited their practical use. A hybrid energy storage system, which comprises a capacitor and battery, is a promising solution to this problem; however, to apply model-based designs, which are indispensable to embedded systems, such as the electronic control units used in EVs, a simple and accurate capacitor model is required. Within this framework, a lithium-ion capacitor (LIC) model is proposed, and its charging and discharging performances are evaluated against an actual LIC. The model corresponds accurately to the actual LIC, and the results indicate that the proposed LIC model will work well when used with Model-Based Design (MBD).

A Comprehensive Review of Lithium-Ion Capacitor Technology: Theory, Development, Modeling, Thermal Management Systems, and Applications

“…Figure 8 b depicts a classical ECM for which a parallel resistor is added to the previous ECM to consider the self-discharge phenomenon [ 53 ]. Figure 8 c illustrates the same topology, in which the overall resistance was split up to the charge/discharge resistances, while three capacitors (C 0 , C 1 , C 2 ) are available in the model in parallel connection [ 54 ].…”

Electrical Circuit Modelling of Double Layer Capacitors for Power Electronics and Energy Storage Applications: A Review

“…This is because the leakage resistance is much larger than the series resistance, therefore it has no significant effect on the performance of the model for an analysis lasting for a short duration. Another derivation from the classical equivalent circuit model was done by Nakajo et al [57]. The authors replaced the capacitance C in the classical equivalent circuit model with a variable capacitor.…”