The health factor extraction and SOH prediction of lithium battery based on douglas-peucker fusion minkowski distance

doi:10.19799/j.cnki.2095-4239.2022.0188

Abstract

Abstract:

To solve the problem of the low prediction accuracy of state of health (SOH) caused by the difficulty in extracting health factors of lithium-ion batteries, a feature-extraction algorithm of lithium-ion battery health factors based on the Douglas-Peucker fusion Min distance is proposed. The algorithm is used to extract the battery data feature under constant current and voltage charging, as well as constant power discharge strategies, to realize the SOH prediction of lithium batteries. First, the characteristic engineering is established for the measured experimental data, and the evaluation index is established using the Min distance. The battery health factor is extracted based on the Douglas-Peucker algorithm, and then the 34-dimensional health factor is obtained. For the extracted health factors, DBSO (difference-mutation brainstorm optimization) algorithm is used for optimization to eliminate irrelevant and redundant features, avoid overfitting of the model and improve model performance. Finally, the SVM (support vector machines) and its optimization model were used to predict the SOH of the battery. The experimental results show that the goodness of fit of the health factors extracted using feature engineering is greater than 0.96 in each SVM model. The DBSO-SVM model has the highest prediction accuracy and the best prediction effect, and the MSE (mean square error) value is less than 3. The proposed feature-extraction algorithm is verified on NASA data using different charging and discharging strategies; the results show that on the SVM model, the goodness of fit of B0005, B0006, and B0007 reaches 0.99, and the RMSE (root mean square error) values are lower than 6%. Compared with the various optimization algorithms, the DBSO-SVM model demonstrated the best performance.

Key words: douglas-peucker algorithm, SOH, minkowski distance, DBSO algorithm, SVM model

CLC Number:

TM 910.7

Wanli CHEN, Mei ZHANG, Tao FENG. The health factor extraction and SOH prediction of lithium battery based on douglas-peucker fusion minkowski distance[J]. Energy Storage Science and Technology, 2022, 11(10): 3306-3315.

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项目	规格	项目		规格
外壳材质	镀镍钢	充电方法 (CC/CV) 操作温度	标准	0.5 C_5 A×7.5 h
标称容量	1300 mAh		快速	1 C_5 A×2.5 h
额定容量	3.7 V		充电	0～45 ℃ 32～113 °F
最大充电电压	4.2 V		充电	0～45 ℃ 32～113 °F
放电截止电压	2.7 V		放电	-15～60 ℃ 5～140 °F
最大充电电流	1 C₅A		放电	-15～60 ℃ 5～140 °F
最大放电电流	3 C₅A		贮存	-20～60 ℃ -4～113 °F
内阻(Max at 1000 Hz)	≤25 mΩ		贮存	-20～60 ℃ -4～113 °F

模型	R²	MSE	RMSE	SSE
DBSO-SVM	0.981	2.858	1.691	277
BSO-SVM	0.979	4.378	2.092	425
ABC-SVM	0.978	8.501	2.916	825
SVM	0.963	76.15	8.73	7386

数据编号	方法	实际寿命	预测寿命	AE	R²	RMSE	SSE
B0005	DBSO-SVM	129	129	0	0.99	0.0012	0.000123
	BSO-SVM		129	0	0.99	0.0066	0.003584
	ABC-SVM		137	8	0.99	0.0163	0.022011
	SVM		141	12	0.99	0.0292	0.070760
B0006	DBSO-SVM	113	113	0	0.99	0.0036	0.001049
	BSO-SVM		113	0	0.99	0.0073	0.004466
	ABC-SVM		116	3	0.99	0.0199	0.032895
	SVM		127	14	0.99	0.0553	0.254118
B0007	DBSO-SVM	126	126	0	0.99	0.0021	0.000383
	BSO-SVM		127	1	0.99	0.0051	0.002195
	ABC-SVM		130	4	0.99	0.0115	0.010924
	SVM		132	6	0.99	0.0208	0.035861
B0018	DBSO-SVM	97	97	0	0.94	0.0108	0.006590
	BSO-SVM		98	1	0.93	0.0114	0.007220
	ABC-SVM		100	3	0.92	0.0183	0.018775
	SVM		120	23	0.81	0.0368	0.075779

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