电测与仪表2025，Vol.62Issue(10)：115-120,6.DOI:10.19753/j.issn1001-1390.2025.10.013
基于负极电阻实时监测的锂电池SOC估计方法
Lithium-ion battery SOC estimation method based on real-time monitoring of negative electrode resistance
摘要
Abstract
Compared with the external parameters,the internal parameters of lithium-ion batteries can better reflect the true state of lithium-ion batteries.However,the existing research on the estimation method of the state of charge(SOC)for lithium-ion batteries is basically based on external parameters.During the charging-discharging process of lithium-ion batteries,the negative electrode resistance changes regularly with the variation in lithium insertion a-mount.Based on this factor,a sensing method to monitor the negative resistance in real time is developed in this paper,moreover,a new method for the SOC estimation based on this method and a data-driven approach is pro-posed.Real-time monitoring of negative electrode resistance is achieved by introducing sensing lug in the negative electrode of the battery,and the position and width of the sensing lug are optimized by current density distribution simulation and long-cycle battery experimentation to reduce the influence of the sensing lug on battery performance.A strong correlation between the negative electrode resistance and SOC is verified through experimental data analy-sis.Additionally,combined with the gated recurrent unit(GRU)model,it is demonstrated that after introducing negative electrode resistance as an input feature,the root mean square error(RMSE)of the test set result is re-duced by 1.08％compared with that before the introduction.The results show that the SOC estimation method based on negative electrode resistance has promising application prospects and research significance.关键词
锂离子电池/内部传感/负极电阻/数据驱动/SOC估计Key words
lithium-ion battery/internal sensing/negative electrode resistance/data-driven/SOC estimation分类
信息技术与安全科学引用本文复制引用
郝杰,冯雪松,张晓琨,向勇..基于负极电阻实时监测的锂电池SOC估计方法[J].电测与仪表,2025,62(10):115-120,6.基金项目
四川省科技计划项目(2069998) （2069998）
四川省科技厅项目(2022ZYD0130) （2022ZYD0130）
