Power battery health evaluation based on improved TCN model

doi:10.19799/j.cnki.2095-4239.2021.0637

Abstract

Abstract:

The state of heath (SOH) of the power battery of an electric vehicle is one of the key monitoring indicators of its battery management system. Accurate evaluation of it is of great significance for the safe and reliable operation of the vehicle. However, existing power battery SOH evaluation methods have problems such as unsatisfactory evaluation accuracy and high computational complexity. For this reason, a power battery health status evaluation method based on an improved Temporal Convolutional Network (TCN) model is proposed. This method first extracts three health factors of equal voltage rise time, equal current fall time, and voltage rise value from the power battery charging data, and uses Pearson correlation coefficient to verify the correlation between them and the battery capacity; then according to the TCN model The receptive field adjusts the encoder-decoder structure, and uses the trained encoder to extract features of the input sequence to obtain the short-term expression of the long-term sequence; finally, the TCN model is used to capture the characteristic time sequence and the battery SOH. Causality, to achieve accurate assessment of the health status of the power battery. The proposed method is applied to the public battery data set, and the experimental results are compared with the widely used time series analysis methods and methods used in related literature. The results show that the proposed method can reduce the root mean square error and absolute average error by 0.0012 respectively. And 0.0008, the calculation time required for the same training times is reduced by 3.4%.

Key words: power battery, health status, encoder, TCN

CLC Number:

TQ 912

Xiaoyuan ZHANG, Jinhao ZHANG, Yajun JIANG. Power battery health evaluation based on improved TCN model[J]. Energy Storage Science and Technology, 2022, 11(5): 1617-1626.

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电池序号	容量/Ah	放电电流	总循环次数	有效循环次数
CS33	1.1	0.5 C/0.55 A	632	592
CS34	1.1	0.5 C/0.55 A	700	621
CS35	1.1	1 C/1.1 A	716	640
CS36	1.1	1 C/1.1 A	791	636

电池序号	DV_UT	DA_DT	DV_RU
CS33	0.987768	-0.843369	-0.968624
CS34	0.993926	-0.876500	-0.966657
CS35	0.990361	-0.870651	-0.592425
CS36	0.993409	-0.904253	-0.938893

评价指标	电池序号	Encorder-TCN	TCN	GRU	LSTM
MSE/%	CS33	0.0167738	0.0412891	0.1702569	0.0437183
	CS34	0.0256044	0.0277419	0.0290808	0.2298263
	CS35	0.0157313	0.0218908	0.0389273	0.0289350
	CS36	0.0096664	0.0133836	0.2969346	0.0362662
RMSE/%	CS33	1.2951373	2.0319711	4.1262198	2.0908928
	CS34	1.6001361	1.6655911	1.7053086	4.7940201
	CS35	1.2542454	1.4795535	1.9729991	1.7010299
	CS36	0.9831776	1.1568763	5.4491701	1.9043677
MAE/%	CS33	1.0180461	1.7207226	2.7546348	1.6967513
	CS34	0.9839263	1.3964472	1.2849554	3.2334339
	CS35	0.9726970	1.1667483	1.5380482	1.3619463
	CS36	0.7271382	0.8386590	4.3778951	1.3251187

Item	Encorder-TCN	TCN	GRU	LSTM
MSE/%	0.0036	0.0090	0.0366	0.0887
RMSE/%	0.5973	0.9504	1.9127	2.9776
MAE/%	0.3650	0.8336	1.7663	2.6325
平均运行时间/s	24.1708	23.0095	25.0214	25.4493

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