Lithium-Ion Battery SoC Equilibrium: An Artificial Potential Field-Based Method

Abstract

Battery balance methods are the key technology to ensure the safe and efficient operation of the energy storage systems. Nevertheless, convenient balance methods experience slow convergence and difficult to adapt to quick charging applications. To solve the problem, in this paper, an artificial potential field-based lithium-ion battery balance method is proposed. Firstly, a cyber-physical model of the battery equalization system is proposed, in which the physical layer models the circuit components and the cyber layer represents the communication topology between the batteries. Then the virtual force function is established by artificial potential field to attract the voltage and state-of-charge of each cell to nominal values. With a feedback control law, the charging current of the battery is reasonably distributed to realize the rapid balance among batteries. The experimental results verify the effectiveness and superiority of the proposed method.

Switched-Resistor Passive Balancing of Li-Ion Battery Pack and Estimation of Power Limits for Battery Management System

“…Since this equalizer does not rely on capacitors, it can be used in battery banks that span a wide voltage range [40]. Each cell's voltage and charge is brought back to their normal values by a virtual force function [41] generated by the artificial potential field. A feedback control law evenly distributes the battery charge current to quickly achieve balance among the batteries.…”