Pole piece and roll core

Abstract

The utility model belongs to power battery technical field discloses a kind of pole piece and roll core.Pole piece includes pole piece main body and first insulating part, pole piece main body includes current collector and the active material layer coated in at least one surface of current collector, pole piece main body includes winding head end and winding tail end oppositely arranged along first direction, current collector includes pole lug side and non-pole lug side arranged along second direction, first direction is perpendicular with second direction;First insulating part covers the part active material layer of non-pole lug side of winding head end and / or winding tail end, and first insulating part is provided with reinforcing structure.Reinforcing structure is provided on first insulating part, the strength of first insulating part can be improved, and the probability of folding of first insulating part is reduced;Utilize first insulating part to reduce the exposed size of active material layer along second direction, to facilitate increasing the A-C Overhang of positive pole piece and negative pole piece, reduce the adverse effect of spin tail, ensure the use safety of power battery.

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