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Battery voltage transfer method for multi-cells Li-ion battery pack protection chips

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Abstract

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.

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Acknowledgments

The research was sponsored jointly by Shaanxi Province Science and Technology Department of China (Project No. 2020CGXNG-001) and Science and Technology on Analog Integrated Circuit Laboratory of the 24th Research Institute of China Electronics Technology Corporation (Project No. 6142802190103).

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Authors and Affiliations

  1. School of Microelectronics, **’an Jiaotong University, **’an, 710049, Shaanxi, China

    Kai-Kai Wu, Hong-Yi Wang, Chen Chen & Tao Tao

  2. Huatech Semiconductor Co. Ltd., **’an, 710049, Shaanxi, China

    Hao Zhang & Kai Wu

  3. School of Electronics and Information, Northwestern Polytechnical, **’an, 710049, Shaanxi, China

    Yu-**n Liu

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  1. Kai-Kai Wu
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Correspondence to Hong-Yi Wang.

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Wu, KK., Wang, HY., Chen, C. et al. Battery voltage transfer method for multi-cells Li-ion battery pack protection chips. Analog Integr Circ Sig Process 111, 13–24 (2022). https://doi.org/10.1007/s10470-021-01836-9

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