抄録
The objective of this study is to find out a simple, time and cost-effective method for the assessment of state of batteries. In this study, the targets of estimation are NiCd, NiMH batteries that are widely used in portable equipments, but are difficult to estimate exact state. In our previous studies, the mathematical model was successfully derived from short-time measurement of voltage and current of battery using proposed signal processing scheme suitable for batteries characteristics. This paper presents a novel estimation method of state of NiMH battery using parameter fluctuations of internal impedance. In the proposed method, an equation for estimation was obtained as a function of parameters. Using this equation, state-of-charges of NiMH batteries were experimentally estimated with error less than 10%.
