Battery monomer and preparation method thereof, battery device and power utilization device

Abstract

The invention discloses a battery monomer and a preparation method thereof, a battery device and a power utilization device. The battery monomer comprises a negative pole piece, the negative pole piece comprises a negative pole current collector, a first negative pole film layer located on at least one side of the negative pole current collector and a second negative pole film layer located on one side, far away from the negative pole current collector, of the first negative pole film layer, and the second negative pole film layer comprises a main body region and a transition region located between the main body region and the first negative pole film layer; the first negative electrode film layer comprises a first binder, the main body region comprises a second binder, and the transition region comprises the first binder and the second binder; the mass content of the first binder in the first negative electrode film layer is M1%, the mass content of the second binder in the main body area is M2%, the sum of the mass content of the first binder and the mass content of the second binder in the transition area is M3%, and M3 is larger than M2 and smaller than M1. The battery monomer provided by the embodiment of the invention has improved cycle performance.

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