Pole piece, winding battery cell and battery

The invention provides a pole piece, a winding battery cell and a battery. The pole piece comprises a current collector, an active material layer and an insulating layer. The current collector comprises two opposite surfaces. At least one of the two surfaces of the current collector is provided with an active material layer. Along the length direction of the current collector, the current collector comprises an empty foil region exceeding the active material layer. The active material layer and the insulating layer are provided in the longitudinal direction. And one part of the insulating layer is lapped with the empty foil region, and the other part is lapped with the active material layer. The insulating layer covers an edge of the active material layer. The pole piece can solve the problem that burrs on the current collector penetrate through the diaphragm to cause short circuit in the battery. 本申请提供一种极片、卷绕电芯以及电池。极片包括集流体、活性物质层和绝缘层。集流体包括相对的两个表面。集流体的两个表面中，至少一者设置有活性物质层。沿集流体的长度方向，集流体包括超出活性物质层的空箔区。活性物质层和绝缘层沿长度方