Electrode piece and battery

An electrode piece, comprising a current collector and a functional layer arranged on a first surface of the current collector, wherein a tab is further arranged in middle of the first surface, the functional layer on the first surface has a first slope area near the tab and a first normal area away from the tab, and a thickness of the first slope area gradually decreases along a direction towards the tab;

• wherein the functional layer comprises an active material layer and a bottom coating layer arranged between the active material layer and the first surface of the current collector, and the active material layer has the first slope area and the first normal area;
• wherein a minimum distance from a surface of the first slope area to the first surface of the current collector is greater than a maximum distance from a surface of the bottom coating layer to the first surface of the current collector;
• wherein a width of the first slope area is 0.25-3 mm;
• wherein a minimum distance from the active material layer to the tab is m, and a minimum distance from the bottom coating layer to the tab is n, 0≤n−m≤3 mm;
• and
• a stripping force between the bottom coating layer and the current collector is more than 30 N/m.