Method for sorting the dynamic characteristics of lithium-ion battery consistency based on production line big data

doi:10.19799/j.cnki.2095-4239.2023.0819

Abstract

Abstract:

As lithium-ion battery production rapidly expands, manufacturers urgently require high-precision and high-efficiency sorting methods to improve the consistency, lifespan, safety, and energy density of battery packs. Traditional techniques that rely on capacity and internal resistance address static consistency postgrouping but fail to ensure dynamic consistency within the same group. Addressing this, our study focuses on the dynamic characteristics of the charge-discharge voltage curve to propose a next-generation sorting approach. We extract key dynamic features from the voltage curve during the battery capacity grading process, utilizing big data from the production line, and employ K-means clustering for battery sorting. Furthermore, we assess battery performance consistency by analyzing metrics from the recharging stage postcapacity grading, devising an evaluation method based on the standard deviation of these metrics. Our proposed sorting method demonstrates a 15.65% improvement in the overall performance consistency of batteries compared to conventional approaches.

Key words: lithium-ion battery, battery consistency, battery sorting, clustering algorithm

CLC Number:

TM 912

Ge LI, Xiangdong KONG, Yuedong SUN, Fei CHEN, Yuebo YUAN, Xuebing HAN, Yuejiu ZHENG. Method for sorting the dynamic characteristics of lithium-ion battery consistency based on production line big data[J]. Energy Storage Science and Technology, 2024, 13(4): 1188-1196.

Figures/Tables 9

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References 36

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一致性评价角度	评价指标	符号
dQ/dV曲线一致性	dQ/dV峰值	dQ/dV_peak
dQ/dV曲线一致性	dQ/dV峰值对应电压	V_d_Q_/d_V_peak
端电压一致性	充电起始电压	Volt_start
端电压一致性	充电末端电压	Volt_end
充电电量一致性	恒流与恒压充电电量比值	Rate_cc/cv
电压曲线一致性	恒流电压曲线平均距离	Distance_volt

分选方法	档位1		档位2		档位3		档位4
分选方法	平均值/Ah	标准差/Ah	平均值/Ah	标准差/Ah	平均值/Ah	标准差/Ah	平均值/Ah	标准差/Ah
随机分选	107.571	0.416	107.527	0.457	107.521	0.462	107.538	0.449
容量分选	106.214	0.180	107.142	0.238	107.833	0.258	108.704	0.164
动态分选	107.108	0.324	107.488	0.327	107.689	0.307	108.040	0.344

评价指标	容量分选	动态分选
dQ/dV峰值	0.8855	0.8158
dQ/dV峰值对应电压	0.7819	0.6797
充电起始电压	0.6815	0.5529
充电末端电压	0.7268	0.5621
恒流与恒压充电电量比值	0.6818	0.5886
电压曲线平均距离	0.7235	0.5804
综合性能一致性	0.7468	0.6299

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