Energies 2013, 6(10), 5538-5551; doi:10.3390/en6105538
Article

Second-Order Discrete-Time Sliding Mode Observer for State of Charge Determination Based on a Dynamic Resistance Li-Ion Battery Model

1email, 1email, 1email, 1email and 1,2,* email
Received: 1 August 2013; in revised form: 4 October 2013 / Accepted: 11 October 2013 / Published: 22 October 2013
(This article belongs to the Special Issue Li-ion Batteries and Energy Storage Devices)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: A second-order discrete-time sliding mode observer (DSMO)-based method is proposed to estimate the state of charge (SOC) of a Li-ion battery. Unlike the first-order sliding mode approach, the proposed method eliminates the chattering phenomenon in SOC estimation. Further, a battery model with a dynamic resistance is also proposed to improve the accuracy of the battery model. Similar to actual battery behavior, the resistance parameters in this model are changed by both the magnitude of the discharge current and the SOC level. Validation of the dynamic resistance model is performed through pulse current discharge tests at two different SOC levels. Our experimental results show that the proposed estimation method not only enhances the estimation accuracy but also eliminates the chattering phenomenon. The SOC estimation performance of the second-order DSMO is compared with that of the first-order DSMO.
Keywords: Li-ion battery; second-order discrete sliding mode observer; dynamic resistance; state of charge
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MDPI and ACS Style

Kim, D.; Koo, K.; Jeong, J.J.; Goh, T.; Kim, S.W. Second-Order Discrete-Time Sliding Mode Observer for State of Charge Determination Based on a Dynamic Resistance Li-Ion Battery Model. Energies 2013, 6, 5538-5551.

AMA Style

Kim D, Koo K, Jeong JJ, Goh T, Kim SW. Second-Order Discrete-Time Sliding Mode Observer for State of Charge Determination Based on a Dynamic Resistance Li-Ion Battery Model. Energies. 2013; 6(10):5538-5551.

Chicago/Turabian Style

Kim, Daehyun; Koo, Keunhwi; Jeong, Jae J.; Goh, Taedong; Kim, Sang W. 2013. "Second-Order Discrete-Time Sliding Mode Observer for State of Charge Determination Based on a Dynamic Resistance Li-Ion Battery Model." Energies 6, no. 10: 5538-5551.


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