Health state estimation of lithium ion battery based on TWP-SVR

doi:10.19799/j.cnki.2095-4239.2022.0184

Abstract

Abstract:

State of Health (SOH) is an important index for evaluating the aging degree and remaining service life of lithium-ion batteries. However, SOH cannot be obtained by direct measurement. This study proposes a method to extract indirect health feature parameters based on time warp profile (TWP) and estimate the SOH using a vector machine regression (SVR) model. First, TWP converts the different cycle charge-discharge voltage curves of a lithium-ion battery into a phase difference curve. Then, four indirect health features are extracted from the phase difference curve. Further, SOH is estimated using the SVR model of the linear kernel function. Finally, it is verified by measured data of energy storage power station and the open-source data sets of NASA, Underwriters Laboratories Inc.-Purdue University (UL-PUR). The experimental results of energy storage power station data show that the sample standard deviation (SSD) of the root mean square error and mean absolute error of the TWP-SVR model is less than 0.0015, and the interquartile range (IQR) is less than 0.0022; the SSD and IQR of mean absolute percentage error are 0.0152 and 0.0220, respectively, indicating that the proposed TWP-SVR method maintains high accuracy and good stability.

Key words: lithium ion battery, status of health, time warp profile, support vector machine regression

CLC Number:

TM 911

Rongyang WEI, Tian MAO, Han GAO, Jianren PENG, Jian YANG. Health state estimation of lithium ion battery based on TWP-SVR[J]. Energy Storage Science and Technology, 2022, 11(8): 2585-2599.

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来源	正极材料	规格	额定容量/mAh	电池数目	实验温度/℃	循环次数范围
NASA^[26]	—	18650	2000	4	24	130～170
UL-PUR^[27]	NCA	18650	3400	21	23	170～800
储能电站	LFP	模组	105000	216	21～30	160

电池	相关系数	间接健康特征
电池	相关系数	F¹	F²	F³	F⁴
5	Pearson	0.9949	0.9978	0.9926	0.9949
	Spearman	0.9725	0.9926	0.9701	0.9826
	Kendall	0.9013	0.9520	0.8959	0.9359
6	Pearson	0.9933	0.9988	0.9948	0.9942
	Spearman	0.9989	0.9990	0.9985	0.9993
	Kendall	0.9805	0.9825	0.9773	0.9859
7	Pearson	0.9891	0.9969	0.9874	0.9872
	Spearman	0.9642	0.9897	0.9637	0.9767
	Kendall	0.8811	0.9397	0.8786	0.9179
18	Pearson	0.9895	0.9972	9.8550	0.9908
	Spearman	0.9951	0.9952	0.9938	0.9971
	Kendall	0.9537	0.9576	0.9490	0.9686

算法	输入数据	特征提取算法	输出特征	拟合模型参数
TWP-SVR	充放电压曲线	TWP	F¹, F², F³, F⁴	1. 核函数：线性核
				2. 惩罚参数：1
				3. 不敏感参数：输出变量的四分位数范围对标准差的十分之一的估计值
TWP-GPR	充放电压曲线	TWP	F¹, F², F³, F⁴	1. 协方差函数：平方指数核
TWP-GPR	充放电压曲线	TWP	F¹, F², F³, F⁴	2. 噪声标准偏差的初始值：输出变量的标准差除以根号二

准确性指标	拟合模型	稳定性指标
准确性指标	拟合模型	样本标准差SSD	四分位差IQR
RMSE	TWP-SVR	0.0046	0.0061
RMSE	TWP-GPR	0.0051	0.0095
MAE	TWP-SVR	0.0044	0.0054
MAE	TWP-GPR	0.0047	0.0092
MAPE	TWP-SVR	0.6886	0.8410
MAPE	TWP-GPR	0.5625	1.0553

参数	采样周期/ms	误差/%	计算周期/s	更新周期/s	备注
电流	25	±0.2	1	60	1秒钟计算一次平均电流，60秒后上传60个电流数据至服务器
电压	50	±0.3	1	60	1秒钟计算一次平均电压，60秒后上传60个电压数据至服务器
电荷量	25	2	1	60	根据电流采样值，使用安时积分法，1秒钟计算一次电荷量，60秒后计上传60个电荷量数据至服务器
SOC	25	2	1	60	根据电荷量计算荷电状态(SOC)，每次放电初始值为100%
SOH	25	2	1	60	根据电荷量计算SOH，电池组装机第一次放电时为100%