State-of-Charge Estimation with State-of-Health Calibration for Lithium-Ion Batteries
AbstractThis research is focused on state-of-charge (SOC) estimation with state-of-health (SOH) calibration for lithium-ion batteries on the basis of the coulomb counting method. The proposed approach intends to present an easy-to-use solution with high accuracy for estimating battery statuses without the need for demanding calculations or hard-earned databases. To estimate the SOC of an aged battery more accurately, the degradation of its full capacity has to be taken into account. By scheduling the battery’s charging/discharging current and monitoring the battery’s status, the existing full capacity can be updated regularly by regular calibration or occasionally by partial calibration, in which the charging/discharging rates are normalized with the latest updated full capacity to agree with the battery’s statuses. To exclude the misestimation caused by current measuring error, the SOC is reset to 0% when the battery is exhausted and 100% for a fully charged battery. With an updated SOH, the battery C-rate is re-scaled accordingly. Experimental tests are carried out to demonstrate that the proposed approach can provide an accurate online indication of batteries’ SOCs. With an implanted error of 0.3% in current measuring, the SOC estimation error can always be less than 1.905% after a number of SOH calibrations. View Full-Text
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Wu, T.-H.; Moo, C.-S. State-of-Charge Estimation with State-of-Health Calibration for Lithium-Ion Batteries. Energies 2017, 10, 987.
Wu T-H, Moo C-S. State-of-Charge Estimation with State-of-Health Calibration for Lithium-Ion Batteries. Energies. 2017; 10(7):987.Chicago/Turabian Style
Wu, Tsung-Hsi; Moo, Chin-Sien. 2017. "State-of-Charge Estimation with State-of-Health Calibration for Lithium-Ion Batteries." Energies 10, no. 7: 987.
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