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| Multi-physical Simulation and Degradation Analysis of Lithium-ion Battery Pack under Dynamic Conditions |
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| DOI：10.7643/issn.1672-9242.2023.06.014 |
| KeyWord:lithium-ion battery pack multi-physics dynamic condition coupling simulation SEI film formation capacity degradation |
| Author | Institution |
| XIA Quan |
Beihang University, Beijing , China |
| REN Yi |
Beihang University, Beijing , China |
| SUN Bo |
Beihang University, Beijing , China |
| YANG De-zhen |
Beihang University, Beijing , China |
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| Abstract: |
| The work aims to propose a simulation analysis method for capacity degradation under actual complex dynamic conditions to improve the accuracy of SOH evaluation of the lithium-ion battery pack. A multi-physical coupling simulation model of the lithium-ion battery pack was established by coupling the P2D electrochemical and thermal model of multiple battery cells and the series parallel equivalent circuit, thermal and fluid dynamic model of the battery pack. A generalized dynamic load spectrum of the lithium-ion battery pack was constructed by analyzing the dynamic characteristics of current, temperature and other operating conditions in the actual use of the battery system. The model validation and the multi-physical simulation analysis of a typical 3 parallel-5 series lithium-ion battery pack were carried out. Then the capacity degradation model based on the SEI film formation mechanism was coupled to analyze the capacity and SoH degradation of each cell in the battery pack under dynamic conditions. The life weak links of the battery pack were obtained. The results showed that the degradation trajectory of the lithium-ion battery was highly nonlinear under dynamic conditions. The battery pack degraded rapidly with the increase of ambient temperature from 25 ℃ to 60 ℃, but the maximum temperature difference inside the battery pack decreased. The proposed method can well quantify the impact of actual complex dynamic conditions on degradation of the lithium-ion battery pack, and provide technical support for its reliability design and operation management. |
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