The application provides a secondary battery and a power utilization device. The secondary battery comprises a positive
electrode, a negative
electrode and an
electrolyte, the
electrolyte comprises an ethoxy-containing additive and a
nitrogen-containing additive; in a
solid electrolyte interface film, 3≤2W O +W N ≤10. The application controls the type of the electrolyte in the secondary battery, and controls the content of
nitrogen elements and
oxygen elements in the
solid electrolyte interface film formed on the surface of the negative
electrode active material layer within a specific range. The
nitrogen-containing compound and the ethoxy-containing compound synergistically act in structure, improve the
fast charging performance and low temperature performance of the battery, inhibit the rupture of the SEI film in the high temperature cycle process, and further prolong the cycle performance of the secondary battery, especially the cycle life and storage performance at high temperature.