Research on Active Equalization of Lithium Battery via SOC

Abstract

This paper presents an active equalization method for lithium battery via SOC. The high accuracy of SOC is promised by extended Kalman filter algorithm (EKF) based on the adaptive parameters equivalent-circuit model at all SOC region. Then a small size, low loss resonant soft-switching active equalization circuit is presented. That circuit combined with SOC do precisely balance the battery pack during charge and discharge processes, which can effectively improve the battery pack’s using life.

A multi‐module equalization system for lithium‐ion battery packs

“…As a non-energy consumption equalization, active equalization 16 refers to the transfer of energy through energy storage elements, to reduce the inconsistency of the battery pack. Active balancing circuit transfers energy from cell to pack, 17,18 from pack to cell, 19,20 or between cells, [21][22][23][24][25][26][27] so it has high energy efficiency and supports fast equalization.…”