Separator, battery cell, battery and electrical apparatus

Abstract

The present application provides a separator, a battery cell, a battery and an electrical apparatus. The separator comprises a separator body and a polymer layer arranged on at least one surface of the separator body. The polymer layer comprises an aldehyde ketone polymer. The aldehyde ketone polymer is made into a sheet-like structural body; the sheet-like structural body is subjected to a dynamic frequency scanning test at (Tm+20)° C. to obtain an elastic modulus G′−loss modulus G″ curve, and the elastic modulus G′−loss modulus G″ curve has a slope of K, wherein 0.8≤K<∞, and Tm° C. represents a melting temperature of the aldehyde ketone polymer.

Dependencies are inferred from the claim text.