Electrode assembly, battery and electrical device

Abstract

Electrode assembly, characterized in that it comprises a straight section and a curved section, wherein the electrode assembly is formed by winding, the curved section being connected to one side of the straight section in the longitudinal direction of the electrode assembly; wherein the electrode assembly further comprises: an electrode foil, wherein the electrode foil is arranged in a wound manner, wherein the electrode foil is provided with a curved corner region, the multilayer curved corner region forming the curved section;a barrier section, wherein the barrier section is arranged on at least one surface at the curved corner region of the electrode foil, wherein the barrier section comprises a base foil layer and an adhesive layer, wherein the barrier section is bonded to the curved corner region by the adhesive layer, wherein the adhesive layer of the barrier section comprises a first adhesive layer and a second adhesive layer, wherein the first adhesive layer is located in a central region of the barrier section, wherein the second adhesive layer is located in at least one edge region of the barrier section, wherein the thickness of the first adhesive layer is greater than the thickness of the second adhesive layer, wherein the thickness of the first adhesive layer is a µm, the thickness of the second adhesive layer is b1 µm, wherein the difference between a and b1 is M;wherein the ratio of the dimension of the curved section arranged on one side of the straight section to the dimension of the straight section along the longitudinal direction of the electrode assembly is N; where M and N satisfy: 17.24 ≤ M / N ≤ 975.61.;