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

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

1
Department of Electrical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, Korea
2
Department of Creative IT Excellence Engineering and Future IT Innovation Laboratory, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, Korea
*
Author to whom correspondence should be addressed.
Received: 1 August 2013 / Revised: 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)
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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. View Full-Text
Keywords: Li-ion battery; second-order discrete sliding mode observer; dynamic resistance; state of charge Li-ion battery; second-order discrete sliding mode observer; dynamic resistance; state of charge
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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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.

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