A MultiWinding Transformer Cell-to-Cell Active Equalization Method for Lithium-Ion Batteries With Reduced Number of Driving Circuits
A MultiWinding Transformer Cell-to-Cell Active Equalization Method for Lithium-Ion Batteries With Reduced Number of Driving Circuits
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DOI：
10.1109/tpel.2015.2482500
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发表时间：
2016-07
影响因子：
6.7
通讯作者：
Y. Chen;Xiaofang Liu;Yangyi Cui;Jiming Zou;Shiyan Yang
中科院分区：
文献类型：
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作者：
Y. Chen;Xiaofang Liu;Yangyi Cui;Jiming Zou;Shiyan Yang
双向电池间均衡方法可以很好地防止串联电池的过充和欠充。然而，以低复杂度实现快速均衡和高均衡效率仍然是一个挑战。为了解决这个问题，我们提出了一种新的双向细胞到细胞的主动均衡方法，使用多绕组Transformer。该方法通过反激或正激方式将能量从最高电压单元直接传递到最低电压单元，平衡路径短，保证了快速的均衡速度。采用低导通损耗的双向开关，均衡效率高。由于双向开关是同时导通或关断的，因此设计了用于双向开关的公共驱动电路，以将驱动电路的数量减少一半。对6个50 Ah锂离子电池组进行了实验，结果表明，我们的新方法在速度、效率和电路复杂度方面都取得了良好的均衡性能。
The bidirectional cell-to-cell equalization methods perform well to prevent the series-connected batteries from overcharging and undercharging. However, it remains a challenge to achieve fast equalization and high equalization efficiency with low complexity. To address the issue, we propose a new bidirectional cell-to-cell active equalization method using a multiwinding transformer. The new method allows the energy to transfer directly from the highest voltage cell to the lowest one by fly-back operation or forward operation which gives a short balancing path and guarantees a fast equalization speed. We adopt the bidirectional switches of low conduction loss for high equalization efficiency. Since the bidirectional switches are turned on or off simultaneously, a common driving circuit for the bidirectional switch has been designed to reduce the number of the driving circuits by half. The experiments with a six 50-Ah Lithium-ion battery strings are conducted and the results have demonstrated that our new approach has achieved a good overall performance of equalization in terms of speed, efficiency, and complexity of the circuit.