Lower plastic, top cover assembly, energy storage device and electric appliance

Abstract

The application provides a lower plastic, a top cover assembly, an energy storage device and an electric equipment. The lower plastic comprises a plastic body and a mesh structure. The plastic body comprises a first side and a second side opposite in a thickness direction Z of the plastic body, and has an explosion-proof valve area. The explosion-proof valve area is used for corresponding to an explosion-proof valve of the energy storage device. The plastic body is provided with a through hole at the explosion-proof valve area, and the through hole penetrates the first side of the plastic body and the second side of the plastic body. The mesh structure is arranged on the second side of the plastic body or in the through hole, and a projection of the mesh structure covers a projection of the through hole in a plane perpendicular to the thickness direction Z of the plastic body. The mesh structure is a multilayer mesh structure, and comprises an outer ring group, a middle ring group and an inner ring group which are sequentially and spacedly arranged from an outer layer to an inner layer. The middle ring group is connected with the outer ring group through a first connecting part, the inner ring group is connected with the middle ring group through a second connecting part, and the connecting strength of the first connecting part is greater than that of the second connecting part.

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