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.
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