A Charging Equalization Circuit with Odd and Even Module for Li-ion Series-Connected Batteries

A charge equalization scheme with odd and even balance module is proposed in this paper, where all batteries in the pack are marked with odd or even number. The forward balance modules (FBM) are connected with battery indicated even number, while the backward balance modules (BBM) are connected with battery indicated odd number. This deliberate arrangement makes equalization circuit absorb advantage of FBM and BBM. Which can not only instantly realize bi-direction equalization, make the excessive energy current be equalized automatically from two direction, But also largely short the equalization time and efficiently prevent individuals from over charging or discharging. An experiment based on DSP controller is introduced to verify the feasibility of this circuit.