ISOLATION FILM, SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND ELECTRICAL APPARATUS

Provided in the present application are an isolation film, a secondary battery, a battery module, a battery pack and an electrical apparatus. The isolation film sequentially comprises a first area, a main area and a second area in a first direction, wherein at least one surface of the first area and/or at least one surface of the second area are/is provided with a fluorescent coating, and the fluorescent coating is used for identifying whether the isolation film is folded. By means of the present application, an isolation film can be identified in a timely manner after being folded, such that a folded isolation film is prevented from being made into a lithium ion battery, thereby facilitating the improvement of the yield of the lithium ion battery. Sont décrits dans la présente demande un film isolant, une batterie secondaire, un module de batterie, un bloc-batterie et un appareil électrique. Le film isolant comprend séquentiellement une première zone, une zone principale et une seconde zone dans une première