BATTERY CELL, BATTERY AND ELECTRICAL DEVICE

A battery cell, a battery and an electrical device, and relates to the technical field of batteries. The battery cell includes a shell and a pressure relief component; the shell includes a first wall portion; the pressure relief component is arranged on the first wall portion, a first weak portion of the pressure relief component defines at least one predetermined pressure relief region, and the pressure relief component is configured to be capable of rupturing along at least part of the first weak portion when the battery cell is subjected to pressure relief; the sum of the areas of the predetermined pressure relief regions is S, the first weak portion includes at least one first weak section, and the area of the cross section, perpendicular to an extension direction, of the first weak section is S, 300 mm≤S≤1500 mm, 0.006 mm≤S≤0.15 mm.