Long-life secondary battery, battery module, battery pack, and power consumption apparatus

A secondary battery, comprising a positive electrode sheet, a negative electrode sheet, and a separator placed between the positive electrode sheet and the negative electrode sheet,

• the positive electrode sheet comprising a positive electrode current collector and positive film layers A1 and B1 respectively provided on two surfaces of the positive electrode current collector, and the negative electrode sheet comprising a negative electrode current collector and negative film layers respectively provided on two surfaces of the negative electrode current collector,
• wherein each of the positive electrode film layers comprises a positive electrode active material selected from a lithium-containing phosphate of an olivine structure and a lithium transition metal oxide,
• wherein each of the negative electrode film layers comprises a negative electrode active material comprising artificial graphite,
• wherein capacities per unit area Cap A1 and Cap B1 of the positive film layers A1 and B1 satisfy 0.7<Cap A1/Cap B1<0.9,
• wherein a negative film layer provided opposite to and separated from the positive film layer A1 by a separator is A2, and capacities per unit area Cap A2 and Cap A1 of the negative film layer A2 and the positive film layer A1 satisfy 1.02<Cap A2/Cap A1≤1.2,
• and the negative electrode current collector of the negative electrode sheet is provided with at least one through hole.