NEGATIVE ELECTRODE SHEET, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK, AND ELECTRIC DEVICE

The present application discloses a negative electrode sheet, a secondary battery, a battery module, a battery pack, and an electric device. The negative electrode sheet disclosed in the present application comprises a negative current collector and an active substance layer arranged on at least one surface of the negative current collector. The active substance layer comprises a first active substance layer and a second active substance layer arranged on the surface of the first active substance layer. The first active substance layer comprises a first active material. The second active substance layer comprises a second active material. The active substance layer meets the following relation: α×CW2≤CW1, wherein α represents the relative factor of the interlayer spacing, (I), and 1≤α≤1.12. According to the secondary battery obtained by using the negative electrode sheet in the present application, both the rate performance and the energy density of the battery can be well improved. La présente demande divulg