Abstract
To mitigate the pressure on energy storage and enhance the flexibility of the power system, lithium-ion batteries are widely utilized in large-scale energy storage in smart grids due to their superior charging and discharging performance and energy storage characteristics. Whereas the inconsistency of lithium battery cells has become a key issue that limits the overall performance of the battery pack. A novel flexible equalization converter is proposed to handle this issue. This converter is combined with a staggered parallel topology and jumper switched, which enables an energy transfer path to exist between any cell to the rest pack and any substring to the rest substring. The electromagnetic transient model and its small-signal model of the proposed converter have been developed in MATLAB to prove its effectiveness. Finally, the conclusion could be arrived at that the proposed topology shows a better performance compared to the traditional method.
Highlights
The gradual establishment and realization of the global energy Internet put forward higher requirements for the sustainable supply management and deployment of future electric energy, in which the large-scale energy storage technology is the cornerstone and plays a vitally important role in the modern industry (Wei et al, 2019a)
The cell to pack (CP) mode and pack to pack (PP) mode are implemented on the equalization separately
Our contribution could be summarized as follows: 1) The jumper switches enable another energy path that could directly release the energy of the overcharged battery to the rest packs
Summary
The gradual establishment and realization of the global energy Internet put forward higher requirements for the sustainable supply management and deployment of future electric energy, in which the large-scale energy storage technology is the cornerstone and plays a vitally important role in the modern industry (Wei et al, 2019a). An independent battery needs to be connected in series or paralleled into groups to output the required power in industrial applications due to its electrochemical limitations. Individual batteries are subject to certain inconsistencies due to the manufacturing process and operating environment factors (Dai et al, 2021). This inconsistency gradually accumulates, thereby increasing the gap in individual recyclable capacity and reducing the overall performance of the battery packs. Once this issue is ignored, it will probably lead to serious safety accidents such as spontaneous combustion or even explosion, especially during the charging and discharging process.
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