Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (8): 2600-2611.doi: 10.19799/j.cnki.2095-4239.2022.0225

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Parameter design of lithium-ion batteries based on a three-dimensional electrochemical thermal coupling lithium precipitation model

Yong MA1(), Xiaohan LI1, Lei SUN1, Dongliang GUO1, Jinggang YANG1, Jianjun LIU1, Peng XIAO1, Guangjun QIAN2()   

  1. 1.State Grid Jiangsu Electric Power Co. , Ltd. Research Institute, Nanjing 211103, Jiangsu, China
    2.State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
  • Received:2022-04-25 Revised:2022-05-14 Online:2022-08-05 Published:2022-08-03
  • Contact: Guangjun QIAN E-mail:ma.y@foxmail.com;qguangjun@163.com

Abstract:

Lithium deposition on the negative electrode of lithium-ion batteries may induce thermal runaway that can lead to safety accidents. The occurrence of lithium precipitation side reactions can be reduced effectively by optimizing the battery design parameters. Therefore, this study proposes a parameter design optimization method for lithium-ion batteries based on a three-dimensional electrochemical, thermal coupled lithium precipitation model. First, the model parameters were classified, and the corresponding parameters were obtained using experiments, exact measurements, literature searches, and parameter identification, respectively. The reversible lithium re-embedding mechanism and heat production model were added to establish a three-dimensional electrochemical, thermal coupling lithium precipitation model. After constructing the model, the accuracy of the model was verified. The verification results showed that the model could simulate the changes in the terminal voltage of the battery at room temperature and low temperature and could quantitatively describe the nonhomogeneous phenomena, such as the degree of lithium precipitation and temperature distribution inside the battery during low temperature large rate charging. Finally, the effects of the battery design parameters on nonhomogeneous lithium precipitation were investigated by analyzing the electrode size and lug position. The simulation results showed that increasing the electrode length would increase the temperature difference in the electrode area and the inconsistency of the current density. The combined effect would advance the lithium precipitation time of the battery slightly, but the effect on the overall degree of lithium precipitation of the battery was relatively small. When the position of the battery tab was on the opposite side of the axis in the longitudinal direction, it could effectively alleviate lithium deposition on the negative electrode, and the relative lithium precipitation degree was reduced by 16.7%.

Key words: lithium-ion battery, three-dimensional electrochemical thermal coupling, re-embedding mechanism, lithium precipitation model

CLC Number: