标题：A Battery Equalizer with Zero-Current Switching and Zero-Voltage Gap Among Cells Based on Three-Resonant-State LC Converters
作者：Shang, Yunlong; Cui, Naxin; Zhang, Qi; Zhang, Chenghui
作者机构：[Shang, Yunlong; Cui, Naxin; Zhang, Qi; Zhang, Chenghui] Shandong Univ, Sch Control Sci & Engn, Jinan 250061, Peoples R China.
会议名称：32nd IEEE Annual Applied Power Electronics Conference and Exposition (APEC)
会议日期：MAY 26-30, 2017
来源：2017 THIRTY SECOND ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC)
关键词：Battery equalizers; battery management systems; switched capacitor; converters (SCCs); zero-voltage gap (ZVG); modularization; electric; vehicles (EVs)
摘要：For the conventional switched capacitor converter (SCC) based equalizers, it is difficult to achieve the full equalization among cells due to the inevitable voltage fall across MOSFET switches. Particularly, when the voltage gap among cells is larger, the balancing efficiency is lower, but the balancing speed gets slower as the voltage gap gets smaller. In order to soften these downsides, this paper proposes a battery equalization topology with zero-current switching (ZCS) and zero-voltage gap (ZVG) among cells based on three-resonant-state SCCs. An additional resonant path is built to release the charge of the capacitor into the inductor in each cycle, which lays the foundations to obtain ZVG among cells, improves the balancing efficiency at a large voltage gap, and increases the balancing speed at a small voltage gap. A four-lithium-ion-cell prototype is applied to validate the theoretical analysis. Experiment results show the proposed topology demonstrates good balancing performance with ZCS and ZVG among cells.