Investigation on the impact of high-temperature calendar and cyclic ageing on battery overcharge performance
2022-01-0872
03/29/2022
- Event
- Content
- With the degradation of lithium-ion batteries, the battery safety performance changes, which further influences the safe working window. In this paper, pouch ternary lithium-ion battery with a rated capacity of 4.2 Ah is used as the research object to investigate the impact of high-temperature calendar and cyclic aging on the tolerance performance. The overcharge-to-thermal-runaway test is performed on the fresh cell and aged cell (90% SOH). the inflection point of voltage for aged cell appears earlier than that of fresh cell, while the voltage corresponding to the inflection point is the same for them, which means that the voltage at which lithium plating occurs is the same. However, the voltage plateau and the crest voltage before thermal runaway of aged cell is significantly higher than that of fresh cell. Besides, for the thermal runaway triggering, ohmic heat, reversible heat, and side reaction heat all make contribution, among them, the side reaction heat plays a dominant role. Moreover, the ratio of heat generated by side reactions increases with aging. Compared with fresh cell, the thermal runaway triggering temperature of high-temperature aging cell is increased, however, the duration of high-temperature cyclic aging cell is reduced, while the duration of high-temperature calendar aging cell is increased. Furthermore, although the maximum temperature of aged cell has not changed significantly, the maximum temperature rise rate is significantly reduced, which may be caused by the loss of active materials. The purpose of this paper is to provide a reference for the design of battery safety management system.
- Citation
- Zhang, G., Chen, S., Zhu, J., Dai, H. et al., "Investigation on the impact of high-temperature calendar and cyclic ageing on battery overcharge performance," SAE Technical Paper 2022-01-0872, 2022, .