Battery monomer, battery and electric device

The utility model discloses a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery cell comprises: a housing comprising a first wall body; the pressure relief mechanism is arranged on the first wall body; the electrode assembly is arranged in the shell, the electrode assembly comprises a main body part, a first tab and a second tab, and the main body part is connected with the first tab and the second tab; the heating film is located in the shell and is in heat conduction connection with the electrode assembly, the heating film is configured to electrically heat the main body part, and the heating film is provided with a first connecting wire and a second connecting wire; and the connecting part is configured to be heated and melted, so that the first tab is electrically connected with the first connecting wire. When thermal runaway happens to the single battery or is about to happen, the heating film can be electrified, and the heating film h