Battery Cell, Battery and Electric Device

A battery cell, wherein the battery cell comprises:

• a positive electrode plate, wherein the positive electrode plate comprises a positive electrode inner ring, a positive electrode current collector, and a positive electrode outer ring arranged sequentially from inside to outside;
• a negative electrode plate, wherein the negative electrode plate comprises a negative electrode inner ring, a negative electrode current collector, and a negative electrode outer ring arranged sequentially from inside to outside;
• a separator, wherein the separator is located between the positive electrode plate and the negative electrode plate, and the positive electrode plate, the separator, and the negative electrode plate are wound together to form the battery cell;
• wherein, a surface density of the positive electrode inner ring is less than that of the positive electrode outer ring, and/or a surface density of the negative electrode inner ring is less than that of the negative electrode outer ring;
• wherein, when the positive electrode outer ring and the negative electrode inner ring are facing each other, a ratio of an areic capacity of the negative electrode inner ring to an areic capacity of the positive electrode outer ring is from 1.1 to 1.5;
• and when the positive electrode inner ring and the negative electrode outer ring are facing each other, a ratio of an areic capacity of the negative electrode outer ring to an areic capacity of the positive electrode inner ring is from 1.1 to 1.5.