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Enhanced coulomb counting method for estimating state-of-charge and state-of-health of lithium-ion batteries |
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| Authors: | Kong Soon Ng Chin-Sien Moo Yi-Ping Chen Yao-Ching Hsieh |
| Affiliation: | 1. Dept. of Electrical Engineering, National Sun Yat-sen University, No. 70, Lien-hai Rd., Kaohsiung City, Taiwan, ROC;2. Lighting Research Laboratory, Industrial Technology Research Institute, No. 195 Chung Hsing Rd., Sec. 4 Chu Tung, Hsin Chu, Taiwan, ROC;3. Dept. of Electrical Engineering, National Dong Hwa University, No. 1, Sec. 2, Da-hsueh Rd., Shoufeng, Hualien, Taiwan, ROC |
| Abstract: | The coulomb counting method is expedient for state-of-charge (SOC) estimation of lithium-ion batteries with high charging and discharging efficiencies. The charging and discharging characteristics are investigated and reveal that the coulomb counting method is convenient and accurate for estimating the SOC of lithium-ion batteries. A smart estimation method based on coulomb counting is proposed to improve the estimation accuracy. The corrections are made by considering the charging and operating efficiencies. Furthermore, the state-of-health (SOH) is evaluated by the maximum releasable capacity. Through the experiments that emulate practical operations, the SOC estimation method is verified to demonstrate the effectiveness and accuracy. |
| Keywords: | Coulomb counting method Lithium-ion battery State-of-charge State-of-health |
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