标题：An Optimized Mesh-Structured Switched-Capacitor Equalizer for Lithium-Ion Battery Strings
作者：Shang Y.; Zhang Q.; Cui N.; Duan B.; Zhang C.
作者机构：[Shang, Y] School of Control Science and Engineering, Shandong University, Jinan, 250061, China.;[ Zhang, Q] School of Control Science and Engineering 更多
来源：IEEE Transactions on Transportation Electrification
关键词：Capacitors; Electric vehicles (EVs); Equalizers; equalizers; Lithium-ion batteries; lithium-ion batteries; mesh structures; Reliability; switched capacitors (SCs); Switches; Transportation
摘要：The existing switched-capacitor (SC)-based equalizers either have slow equalizing speed and low efficiency or have bulky volume and low reliability. Therefore, an optimized mesh-structured switched-capacitor (SC) equalizer (MSSCE) is introduced to achieve a trade-off between the equalization performances and size as well as cost. The proposed MSSCE achieves all the shortest balancing paths from one cell to any cell in a battery string, significantly improving the equalization speed and efficiency. The switching impedance of the proposed MSSCE is derived and analyzed, which provides a design guidance for the switching frequency and the capacitance. A four-cell prototype was set up. Experiment results confirm that the proposed MSSCE enhances the balancing speed with a high efficiency of 91.7%, moreover which is robust to the imbalanced cell voltages. IEEE