With advancement and increase in usage of Li-ion batteries in sectors such as electronic equipment’s, Electric Vehicles etc battery lifetime is critical for estimation of product life. It is well known that temperature and voltage strongly influence the degradation of lithium-ion batteries and that it depends on the chemical composition and structure of the positive and negative electrodes. Lithium batteries are continuously subjected to various load cycles and ambient temperatures depending on application of battery. Thus, in many applications Cycle aging could be the main contributor or factor for battery degradation, thus reduction in life of product. Thus, there is strong need for researchers and engineers to help improve life of cells or batteries being used in electric vehicles.
In this present work, cycle aging of commercial 18650 cell is studied at ambient temperature. Experimental data shows that about nearly 20 % cell capacity degrades at ambient temperature. A numerical model is built using GT-Auto lion and validation study is conducted.
Further the work is extended numerically for different ambient temperatures. Ambient temperatures of 45degC, 5 degC and 25 deg C have been studied in the present work. Effect of parameters such as ambient temperature on SEI growth of electrode has been studied. Findings provide critical design insight to help cell manufacturers to come up with proper methodology that can be adapted to help prevent capacity degradation of cell. Thus, help improve life span of a product.