SECONDARY BATTERY AND ELECTRIC DEVICE

The embodiment of the invention provides a secondary battery and a power utilization device, the secondary battery comprises an electrode assembly, the electrode assembly comprises a main body part and a tab extending from the main body part, the main body part comprises a negative pole piece, and the negative pole piece comprises a positive pole piece and a negative pole piece; the negative electrode piece comprises a negative electrode current collector and a negative electrode film layer arranged on at least one surface of the negative electrode current collector, the negative electrode film layer comprises a first area and a second area arranged on at least one side of the first area in the extending direction of the tab, the first area comprises a first negative electrode active material, and the second area comprises a second negative electrode active material. The first area comprises a first negative electrode active material, the second area comprises a second negative electrode active material, the powder OI value of the first negative electrode active material is marked as OIa, the powder OI value of the second negative electrode active material is marked as OIb, and the negative electrode film layer meets the condition that OIa is smaller than OIb.