Generalized Peukert Equations Use for Finding the Remaining Capacity of Lithium-Ion Cells of Any Format

• Main Authors: Nataliya N. Yazvinskaya, Nikolay E. Galushkin, Dmitriy V. Ruslyakov, Dmitriy N. Galushkin
• Format: Article
• Language: English
• Published: MDPI AG 2021-08-01
• Series: Energies
• Subjects: Peukert equation; lithium-ion; capacity; discharge current; cell
• Online Access: https://www.mdpi.com/1996-1073/14/16/5009

In many studies, for predicting the remaining capacity of batteries belonging to different electrochemical systems, various analytical models based on the Peukert equation are used. This paper evaluates the advantages and disadvantages of the most famous generalized Peukert equations. For lithium-ion batteries, the Peukert equation cannot be used for estimation of their remaining capacity over the entire range of discharge currents. However, this paper proves that the generalized Peukert equations enable estimation of the capacity released by lithium-ion batteries with high accuracy. Special attention is paid to two generalized Peukert equations: <i>C = C_m</i>/(1 + (<i>i/i0</i>)<i>ⁿ</i>) and <i>C = C_m</i>erfc((<i>i-i0)/n</i>))/erfc(-<i>i0/n</i>). It is shown that they correspond to the experimental data the best.