Intelligent winding technology of power batteries

doi:10.19799/j.cnki.2095-4239.2024.0167

Abstract

Abstract:

In the realm of wound cell quality control, tab alignment accuracy stands as a paramount yet intricate factor influencing multiple stages of the production process. To address the challenges associated with the alignment accuracy of multiple tabs in cells, this paper introduces a tab position model coupled with an edge closed-loop control algorithm. This approach facilitates the detection, correction, and control of various parameters impacting alignment accuracy, thus providing a theoretical foundation for enhancing existing control technologies and ensuring precise control over tab alignment. Furthermore, the tab position model elucidates the effects of diverse parameters on tab positioning and the manifestation of tab misalignment. This enables research and development personnel to gauge the impact of these parameters on misalignment and devise corrective strategies articulated through control methodologies. The synergy of simulation analysis and empirical control evaluations underscores the control method's adaptability in refining tab positioning, with the model accurately depicting the tab's positional dynamics. Additionally, this study delves into a logical framework for realizing a comprehensive closed-loop system in intelligent winding, aiming to optimize the control loop throughout the winding process. The insights gleaned hold substantial relevance for achieving a quality-centric closed-loop in winding operations, thereby enhancing battery performance and production efficiency.

Key words: power battery, tabs misalignment, intelligent winding, edge closed-loop, overall closed-loop

CLC Number:

TB 112

Ao KE, Rukun YANG, Xueke WU. Intelligent winding technology of power batteries[J]. Energy Storage Science and Technology, 2024, 13(4): 1176-1187.

Figures/Tables 18

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References 5

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根据正态分布计算 calculate based on normal distribution			根据平均数计算 calculate based on mean
正极厚度偏差/mm	负极厚度偏差/mm	概率	上隔膜厚度偏差/mm	下隔膜厚度偏差/mm	概率
0.003	0.003	1.15%	0.001	0.001	33.33%
0.002	0.002	7.85%	0	0	33.33%
0.001	0.001	23.85%	-0.001	-0.001	33.33%
0	0	34.30%	—	—	—
-0.001	-0.001	23.85%	—	—	—
-0.002	-0.002	7.85%	—	—	—
-0.003	-0.003	1.15%	—	—	—

情况占比	极组总体厚度偏差/mm	卷针直径变化量(最优)/mm	正极耳错位量(绝对值)(ABS)/mm	负极耳错位量(绝对值)(ABS)/mm	可行性 (小于7 mm)	合格率	可行性 (小于6 mm)	合格率
0.001%	0.008	-0.345	10.89	10.67		99.60%		97.95%
0.023%	0.007	-0.3	9.4	9.6
0.174%	0.006	-0.258	8.11	8.12
0.826%	0.005	-0.215	6.7	6.77	√
2.729%	0.004	-0.175	5.61	5.35	√		√
6.627%	0.003	-0.13	4.06	3.93	√		√
12.230%	0.002	-0.085	2.64	2.86	√		√
17.525%	0.001	-0.044	1.35	1.35	√		√
19.732%	0	0	0	0	√		√
17.525%	-0.001	0.044	1.35	1.35	√		√
12.230%	-0.002	0.085	2.64	2.86	√		√
6.627%	-0.003	0.13	4.06	3.93	√		√
2.729%	-0.004	0.175	5.61	5.35	√		√
0.826%	-0.005	0.215	6.7	6.77	√
0.174%	-0.006	0.258	8.11	8.12
0.023%	-0.007	0.3	9.4	9.6
0.001%	-0.008	0.338	10.89	10.67

情况占比	总体厚度偏差范围/mm	正极厚度变化范围/mm	正负极极耳错位边界范围/mm
0.13%	0.005	-0.0057～-0.0042	(-6.84/-5.60)～(5.17/6.41)
1.13%	0.004	-0.0047～-0.0032	(-6.53/-5.60)～(5.47/6.41)
4.78%	0.003	-0.0037～-0.0022	(-6.38/-5.60)～(5.63/6.41)
11.98%	0.002	-0.0028～-0.0012	(-6.87/-6.41)～(5.78/6.41)
20.09%	0.001	-0.0018～-0.0002	(-6.71/-6.41)～(6.10/6.41)
23.78%	0	-0.0008～0.0008	(-6.41/-6.41)～(6.16/6.41)
20.09%	-0.001	0.0008～0.0018	(-6.10/-6.41)～(6.71/6.41)
11.98%	-0.002	0.0012～0.0027	(-5.79/-6.41)～(6.22/5.60)
4.78%	-0.003	0.0022～0.0037	(-5.63/-6.41)～(6.38/5.60)
1.13%	-0.004	0.0032～0.0047	(-5.48/-6.41)～(6.53/5.60)
0.13%	-0.005	0.0042～0.0057	(-5.17/-6.41)～(6.84/5.60)

整体偏差值(除正极外) deviation (except for anode)	正极偏差值 anode deviation	极耳偏移量(＋/-) tab misalignment	卷针直径调节(最优) diameter change	调节后极耳偏差值(+/-) adjusted tab misalignment
0.006	-0.0042	14.42/12.85	-0.076	2.95/-2.88
0.007	-0.0042	22.43/20.86	-0.114	4.52/-4.12
0.008	-0.0042	30.44/28.56	-0.158	5.62/-5.71
0.009	-0.0042	38.45/36.25	-0.199	7.19/-7.09
-0.006	0.0038	-17.62/-16.05	0.09	-3.49/3.41
-0.007	0.0038	-25.64/-24.06	0.133	-4.74/4.80
-0.008	0.0038	-33.65/-31.76	0.175	-6.15/-6.25
-0.009	0.0038	-41.66/-39.46	0.216	-7.73/7.63

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