In order to suppress leakage current caused in the traditional multi-cells series Li-ion battery pack protection system, a new battery voltage transfer method is presented in this paper, which uses the current generated in the transfer process of one of the batteries to compensate for the leakage of itself and other cells except the top cell. Based on the 0.18 µm Bipolar and CMOS and DMOS technology, this proposed circuit has been integrated into a 7-cells Li-ion battery charge and discharge protection chip successfully. The experimental results of cell balancing confirm that the balancing algorithm can help with the shortage of the voltage transfer circuit. Furthermore, analysis of 20 samples shows that the new method can greatly suppress the battery leakage. Compared with the traditional solution, the voltage transfer circuit proposed in this paper greatly reduces the leakage current, which helps to extend the service life of the battery.

为了抑制传统的多节串联锂离子电池组保护系统中产生的泄漏电流，本文提出了一种新的电池电压传输方法，该方法利用其中一个电池的传输过程中产生的电流来补偿用于自身和除顶部单元格以外的其他单元格的泄漏。基于0.18 µm的双极型，CMOS和DMOS技术，该电路已成功集成到7节锂离子电池充放电保护芯片中。电池单元平衡的实验结果证明，该平衡算法可以解决电压传输电路的不足。此外，对20个样品的分析表明，该新方法可以极大地抑制电池泄漏。与传统解决方案相比，