ELECTRODE ASSEMBLY, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND ELECTRICAL DEVICE

An electrode assembly, secondary battery, battery module, battery pack and electrical device are provided. In some embodiments, the electrode assembly comprises a positive electrode plate, a negative electrode plate and a separator disposed between the positive electrode plate and the negative electrode plate, the positive electrode plate satisfies CAP1=CAP2, in which CAP1 represents capacity of the first positive electrode film layer in Ah, CAP2 represents capacity of the second positive electrode film layer in Ah, and the electrode assembly satisfies |R/R-R/R|>0, in which R represents resistance of the first positive electrode film layer in Ω, R represents resistance of the second positive electrode film layer in Ω, R represents resistance of the first negative electrode film layer in mΩ and R represents resistance of the second negative film layer in mΩ. The present applicant may extend the cycle life of the secondary battery.