| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and a device of measuring the internal resistance R and capacitance C, in an electric double layer capacitor having curvilinear charge/discharge characteristics. <P>SOLUTION: From a measured terminal voltage V, the charge time t<SB POS="POST">ch</SB>and the discharge time t, the difference ΔQ of the charges Q<SB POS="POST">ch</SB>during charge and the charges Q during discharge, and the discharge energy W being discharged from a terminal during discharge are calculated. The internal resistance R is then determined analytically from the ΔQ, and the calculation formulae of divergence energy ΔW, i.e., the difference between the discharge energy W and the discharge energy W<SB POS="POST">0</SB>of linear discharge characteristics. From the internal resistance R and the ΔQ thus calculated, the voltage coefficient α of a component αV<SB POS="POST">c</SB>dependent on the voltage in the capacitance of an electric double layer capacitor is calculated, and then the capacitance C is calculated from the internal resistance R and the voltage coefficient α thus calculated. <P>COPYRIGHT: (C)2013,JPO&INPIT |
