Electrode sheet, battery cell, battery, battery pack and electrical device

Abstract

Electrode sheet (100), characterized in that it comprises: a current collector (110), wherein the thickness of the current collector (110) is D2; an active material layer (120), wherein the active material layer (120) covers at least one surface of the current collector (110), several grooves (121) are arranged on a side of the active material layer (120) facing away from the current collector (110), a minimum distance between two adjacent grooves (121) is Q, the thickness of the active material layer (120) is D1, and the unit of Q, D1, and D2 is each µm; wherein 0.67 μm ≤ QD1 ÷ D2 ≤ 75 μm.