Abstract
Electrostatic capacity C and internal resistance R are two most important parameters that characterize the electric behavior of EDLC （electric double layer capacitor）. Since the charge and discharge characteristic of EDLC depends on the product of R and C，RC，an appropriate representation of the equivalent circuit of EDLC becomes very important. Previously we developed an equivalent circuit model taking account of pseudo capacitance. Following this circuit model, we came to have an assumption that if the volume and width of the used material of EDLC are kept constant，then a shorter and thicker EDLC might have a relatively larger C and smaller R，that is a favorable feature as a power storage device. To verify this supposition，we have made various experiments on the three different shapes of EDLCs in terms of length and thickness，while the volume and width of these EDLCs are kept constant. In this paper，we first discuss how the values of R and C depend on the shape of EDLC using a proposed equivalent circuit model and then，comparing the theoretically analyzed results with those of experiments，we confirm the favorable shape of EDLC with regard to R and C values.
