SEPARATOR, ELECTRODE ASSEMBLY, SECONDARY BATTERY, AND ELECTRIC APPARATUS

This application provides a separator, an electrode assembly, a secondary battery, and an electric apparatus, where a resilience coefficient k of the separator ranges from 10% to 90%, where k=(H−H)/H×100%, Hrepresents an initial thickness of the separator at 25° C., and Hrepresents a thickness of the separator having the initial thickness Hafter compressed at 25° C. with a load of 0.8 MPa for 60 seconds and then relaxed for 60 s after the load is removed. The separator of this application has excellent resilience performance.