access icon free State-of-charge estimation with aging effect and correction for lithium-ion battery

© The Institution of Engineering and Technology
Received 14/02/2013, Accepted 06/08/2014, Revised 31/08/2013, Published 16/10/2014

This study proposes Lithium-ion battery aging correction state-of-charge (SOC) estimation techniques. Although the battery is aging, the SOC error estimation system maintains the setting range using a low-cost 8 bit micro-controller. The proposed method can track and correct the open-circuit voltage against capacity in the battery management system by comparing the capacity error with the coulomb counting and look-up table methods. The experimental results verify that the SOC estimation error is still lower than 3.5% after 1000 cycles. The SOC estimation verification platform verifies the Sanyo UR18650 W lithium battery. After 300 accelerated aging cycle charge–discharge tests, the test results showed that the SOC prediction precision for an aged battery is as high as 2.67%.

Inspec keywords: ageing; microcontrollers; table lookup; secondary cells; life testing; lithium

Other keywords: lithium-ion battery aging correction; look-up table methods; SOC estimation error; aging effect; accelerated aging cycle charge–discharge tests; SOC error estimation system; SOC estimation verification platform; coulomb counting; state-of-charge estimation; 8 bit micro-controller; capacity error; SOC estimation techniques; open-circuit voltage; Li; battery management system; Sanyo UR18650 W lithium battery

Subjects: Secondary cells; Secondary cells

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