Research on safety management strategy for the whole-life-cycle of power batteries in electric vehicles

The whole-life-cycle safety management strategy of batteries is crucial for its in-service as well as cascade utilization. However, there is currently limited research on strategies for the safety management battery with whole-life-cycle. Therefore, this research proposes a comprehensive safety management strategy covering the whole-life-cycle of the battery, addressing safety issues arising from aging as well as after-retirement handling. This paper first summarizes commonly used methods for detecting the battery aging state and proposes a novel approach that combines the evolution of characteristic peaks based on voltage distribution probability density with incremental capacity curves. This method is applied to analyze operational data from real-world vehicles, achieving capacity degradation assessment for the battery before-retirement. Next, a novel multi-dimensional state of health indicator extraction method is introduced for assessing the retired battery. Based on this, a hierarchical management methodology for decommissioned battery application scenarios is established. Finally, a comprehensive life-cycle safety management strategy covering the period before and after battery retirement is developed. This strategy is crucial for ensuring the battery safe operation and environmental protection throughout their whole-life-cycle.