Abstract
An energy-storage scheme with hierarchical equalization charging topology applied in a series-connected battery system is proposed in this paper. The proposed hierarchical equalization charging topology (HECT), which combines an equalizer-within module (EWM) and an equalizer between the modules (EBM), is able to rapidly achieve charging balance among a large number of cells in battery modules. The EWM is composed of a buck–boost converter, while a flyback converter constitutes the EBM. Besides, the voltage of each cell in battery modules can be accurately monitored by utilizing the proposed HECT control architecture. In addition, fewer circuit elements are required in the proposed battery equalization system and a faster balancing speed can be achieved. Satisfactory experimental results were obtained by using 12 LiFePO4 batteries, and the performance was improved by about 50% in reducing the battery voltage deviation realized in the proposed battery balancing system, which verified the function of the proposed HECT scheme.
Highlights
IntroductionEnergy conservation and reduction of carbon dioxide to avoid the greenhouse effect are the goals of clean and green energy promoted by countries all over the world today
LiFePO4 batteries with uneven battery voltage are applied to the proposed batper s, and theD,total batteryinbalancing time is
This paper proposes a power conversion technique with a hierarchical equalization charging topology, which is suitable for series-connected battery systems
Summary
Energy conservation and reduction of carbon dioxide to avoid the greenhouse effect are the goals of clean and green energy promoted by countries all over the world today. Batteries are an important part of clean and green energy technology and are consistent with this goal. The battery pack supplies power to the DC load through the DC bus, and supplies power to the AC load through the inverter. Due to the high conversion efficiency of batteries, which is far better than the internal combustion engine of gasoline vehicles (GV) [1], the electric vehicle (EV) industry has developed rapidly and has become a hot topic in recent years. Portable and wearable storage products are popular development trends for electronic products. Batteries are necessary and indispensable components in mobile devices and wearable devices, and their importance is self-evident
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