Abstract
Battery state of charge is related with available capacity. Battery available capacity varies with temperature and discharge current. A good way to forecast available capacity is Peukert's equation. In order to verify the practicability of Peukert's equation at room temperature and low temperature, 1/3C, 1C, 2C, 3C rate discharge experiments were undertaken. The result indicates Peukert's equation is suitable for estimating available battery of NiMH battery in 25 C. The result also indicates, at low temperatures, Peukert's equation is practical for NiMH battery at low current and unpractical in high current. Based on the result, a piece-wise Peukert's equation with Temperature Correction Factor to NiMH Battery State of Charge (SOC) estimation has been proposed. The proposed method improves the precision of SOC estimantion.
