Abstract
Abstract SOC (State Of Charge) estimation based battery management is important for HEV (Hybrid Electric Vehicle) applications. There are many difficulties in SOC estimation of HEV NiMH (Nickel Metal Hydroxide) batteries, for example, gassing at charge, self discharge, hysteresis and relaxation of OCV (Open Circuit Voltage), memory effect during charge-discharge cycling, and so on. In this paper, a modeling of hysteresis and relaxation of HEV NiMH battery is investigated. Model structure is simple, and model parameters are fitted by using voltage and current measurements. Accuracy of modeling is evaluated by using experimental results of 7.2V, 6.5Ah NiMH battery module.
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