A lithium-ion capacitor (LIC) is a hybrid energy storage device combining the energy storage mechanisms of lithium-ion batteries (LIBs) and electric double-layer capacitors (EDLCs), which incorporates the advantages of both technologies and eliminates their drawbacks. This article presents a novel semi-empirical electro-thermal equivalent circuit model (ECM) for LIC technology up to 500 A and from −20 to +60 °C. The performance of two ECMs, a first- and second-order model, is thoroughly evaluated and compared. The second-order model was selected due to its higher accuracy and superior voltage behaviour prediction for all temperatures. The parameter extraction techniques and governing equations are explained in detail. Since temperature highly affects an LIC's performance and electrochemical behaviour, influencing all presented parameters, a 1D thermal model was combined with the ECM model to further study the effect of temperature. The first order electrical circuit of the 1D thermal model is successfully capable of predicting the thermal behaviour. The thermal model's parameters were extracted and comprehensively explained. Finally, the presented model was validated through experiments for continuous dynamic currents up to 300 A and for pulse currents up to 500 A at different temperatures with an acceptable error of less than 5%.

锂离子电容器（LIC）是一种混合储能设备，结合了锂离子电池（LIB）和双电层电容器（EDLC）的储能机制，结合了这两种技术的优点，并消除了它们的缺点。本文提出了一种适用于LIC技术的新型半经验电热等效电路模型（ECM），该模型的最大工作电流为500 A，温度范围为−20至+60°C。彻底评估并比较了两个ECM（一阶和二阶模型）的性能。选择二阶模型是因为其在所有温度下都具有较高的精度和出色的电压行为预测。详细说明了参数提取技术和控制方程。由于温度在很大程度上影响LIC的性能和电化学行为，因此会影响所有显示的参数，一维热模型与ECM模型相结合以进一步研究温度的影响。一维热模型的一阶电路可以成功预测热行为。提取并全面解释了热模型的参数。最后，通过实验验证了所提出的模型在不同温度下的高达300 A的连续动态电流和高达500 A的脉冲电流，可接受的误差小于5％。