Battery shell and preparation method thereof, secondary battery and power utilization device

The invention provides a battery shell and a preparation method thereof, a secondary battery and an electric device. The battery shell comprises a shell body, wherein an insulating protective layer is arranged on at least part of the surface of the shell body; the bending fracture angle of the insulation protection layer is 20 degrees to 60 degrees, and the anti-impact height of the insulation protection layer is 0.2 m to 2 m. The preparation method comprises the following steps: coating at least part of the surface of the shell with a resin prepolymer coating, and then carrying out cross-linking curing; the resin prepolymer coating comprises a prepolymer and a toughening agent. According to the invention, the problem that the insulating layer on the battery shell is easy to crack and fall off is solved. 本申请提供了一种电池外壳及其制备方法、二次电池、用电装置。一种电池外壳包括壳体，所述壳体的至少部分表面设有绝缘防护层；所述绝缘防护层的弯曲断裂角度为20°~60°，抗冲击高度为0.2~2m。其制备方法包括：在壳体的至少部分表面上涂布树脂预聚体涂料，之后交联固化；所述树脂预聚体涂料包括预聚体和增韧剂。本申请解决了电池外壳上绝缘层容易开裂、脱落的问题。