A Hierarchical Active Balancing Architecture for Lithium-Ion Batteries
A Hierarchical Active Balancing Architecture for Lithium-Ion Batteries
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DOI：
10.1109/tpel.2016.2575844
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发表时间：
2017-04
影响因子：
6.7
通讯作者：
Zhiliang Zhang;Handong Gui;Dong-Jie Gu;Yang Yang-Yang;X. Ren
中科院分区：
文献类型：
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作者：
Zhiliang Zhang;Handong Gui;Dong-Jie Gu;Yang Yang-Yang;X. Ren
提出了一种适用于串联锂离子电池的分层主动平衡结构。该架构的关键是通过将电池组分组成不同的电池组并引入顶层，消除了不同电池组中电池之间的耦合影响，从而减少了所需的平衡时间和能量损失。避免了反复充放电问题，有利于提高电池的健康状态。此外，该架构还可以降低平衡电路的额定电流，从而降低所需成本，提高系统效率。在此基础上，提出了一种利用每个单元的充电状态来实现平衡的控制方法。此外，为了将能量从一个分组双向传输到任何其他分组，提出了一个多向多端口转换器和电流控制方法作为顶层。该变换器不同于传统的三端口变换器，它可以实现任意数量端口的任意电流流向控制。基于24个串联的200 ah锂离子电池的实验结果验证了所提出的结构和平衡电路的优点。平衡后，节省电池组总能量的4.1%。与传统的相邻细胞-细胞结构相比，该结构可将平衡时间和平衡过程中的能量损失分别减少27.6%和44.0%。此外，本架构平衡电路的额定电流和成本仅为其他文献的37.5%和11.5%。
This paper proposes a hierarchical active balancing architecture for the series-connected lithium-ion batteries. The key point of the architecture is that by grouping the battery string into different packs and introducing the top layer, the coupled influence among the cells in different packs is eliminated, which reduces the required balancing time and the energy loss. The repeated charging and discharging problem is avoided, which is beneficial for increasing the state-of-health. Moreover, the proposed architecture can lower the current rating of the balancing circuits, which helps decrease the required cost and improve the system efficiency. On the basis of the architecture, a balancing control using the state-of-charge of each cell is proposed to achieve the balance for all the cells. Furthermore, to deliver the energy from one pack to any other pack bidirectionally, a multidirectional multiport converter along with the current control method is proposed to serve as the top layer. This converter is different from the conventional three-port converter as it can achieve the arbitrary current flow direction control for any number of ports. The experimental results based on 24 series-connected 200-Ah lithium-ion batteries verified the benefits of the proposed architecture and the balancing circuits. After balancing, 4.1% of the total energy of the battery string is saved. Compared to the conventional adjacent cell-to-cell architecture, the proposed architecture can decrease the balancing time and the energy loss during the balancing process by 27.6% and 44.0%, respectively. In addition, the current rating and the cost of the balancing circuits in the proposed architecture is only 37.5% and 11.5% of that in other references.