Slight overcharging cycling failure of commercial lithium-ion battery induced by the jelly roll destruction

Lithium-ion battery is the main power source of electric vehicles and hybrid electric vehicles due to its excellent properties. However, battery suffers overcharging during its use because of inconsistency among batteries, malfunction of charge control and inappropriate battery management. The failure behaviour, mechanism and diagnosis of battery under slight overcharging cycling are studied in this work. The experimental results indicate that battery capacity is approximately zero after failure. The industrial computed tomography images indicate that the jelly roll is destroyed by internal short circuit. This is the reason of battery failure. Impedances of battery increase much. The results of energy dispersive spectrometer indicate the occurrence of Al3+ ions. It means that the aluminium current collector is corroded. Finally, incremental capacity analysis and resistance estimation can be used to diagnose jelly roll destruction and detect failure battery respectively.