An improved reliability assessment method for lithium-ion battery system considering imbalanced current and uneven cooling

Wenhao Zhu, Fei Lei, Hao Zhong and Dongjie Wang

Energy, 2023, vol. 276, issue C

Abstract: The safety and reliability of lithium-ion battery system is the main safeguard promoting widespread applications. However, the reliability assessment of the battery system is still insufficient due to dynamic changes and ageing propagation between cells. To evaluate the reliability of battery system accurately, an improved reliability assessment method integrating the multi-physics model and universal generating function (UGF) method is proposed, taking imbalanced current and uneven cooling into account. In the multi-physics model, an electric-thermal-flow-ageing coupling model is established. The UGF-based method is employed to evaluate the multi-state system reliability of battery system. Based on the reliability method, the interaction influence of imbalanced current and uneven cooling on the reliability of the battery system is analyzed contrastively. To explore the influence of parallel cells on reliability, different redundancy strategies are evaluated and analyzed. Meanwhile, suitable uneven cooling schemes are studied. The results show that the degradation rate of cells is accelerated while incorporated the imbalanced current and uneven cooling. Compared with the traditional reliability assessment, the maximum reliability deviation reaches approximately 1780 cycles. Unlike initial assumption, increasing the parallel cells does not always improve the reliability of battery packs due to the improvement of probability of current imbalance.

Keywords: Reliability; Inconsistency; Multi-physics model; Battery pack; Electric vehicle (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:276:y:2023:i:c:s0360544223008186

DOI: 10.1016/j.energy.2023.127424

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