▎ 摘　　要

NOVELTY - Electrode assembly comprises a positive pole piece (10), a negative pole piece (12) and an isolation film (11) which is arranged between positive pole piece and negative pole piece. The capacity per unit area of negative pole piece is mAh/cm2, 0.97 not less than a not less than 8.84, and half-charge shrinkage rate of separator is st, st=(L0-L1)/L0, where L0 is initial length of isolation film in electrode assembly, L1 is length of isolation film when the electrode assembly is charged to 3.7-4.0V, 0.5% not less than st not less than 5%, and a and st satisfy 19.4 not less than a/st not less than 1768. USE - Electrode assembly used in an electrochemical device and an electronic device (all claimed). ADVANTAGE - The electrode assembly has reduced deformation, and improves cycle stability of electrochemical device. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of electrode assembly. Positive pole piece (10) Isolation film (11) Negative pole piece (12)