wound battery core, battery and power-consuming device

Abstract

A wound battery core, characterized in that it comprises an electrode plate (200) and a separator (100), wherein the electrode plate (200) comprises a current collector extending in a first direction, wherein an active substance layer and a non-active substance region (201) are provided on at least one surface of the current collector, wherein the active substance layer and the non-active substance region (201) are arranged along a second direction, wherein the wound battery core has a curved part (230) and a straight part (240), wherein the curved part (230) is formed by bending the electrode plate (200);wherein the wound battery core further comprises a protective adhesive tape (300), wherein the protective adhesive tape (300) is at least partially adhered to the surface of the active substance layer and is at least partially arranged on the curved part (230), wherein the protective adhesive tape comprises a substrate layer (310) and an adhesive layer (320), wherein the adhesive layer (320) and the non-active substance area (201) are at least partially adhesively bonded to each other;wherein in the second direction the ratio of the dimension d1 of the non-active substance area (201) to the dimension d2 of the electrode plate (200) is designated as K, wherein the second direction is arranged perpendicular to the first direction, wherein along the first direction the distance from the front end (203) of the electrode plate (200) to the protective adhesive tape (300) is designated as L, wherein the dimension of a single protective adhesive tape (300) along the first direction is designated as D, wherein K, L, D satisfy the relationship 1.2×10-4≤ (D×K) / L ≤ 460×10-4.;