Current collecting plate, battery, battery device and electric equipment

The utility model discloses a current collecting disc, a battery, a battery device and electric equipment. The current collecting disc comprises a disc body and a convex piece, the tray body has a tray surface; the protruding part is arranged on the disc surface, the protruding part comprises a first end surface and a second end surface which are opposite to each other, the first end surface is connected with the disc surface, the protruding part is used for penetrating into the tab, the area of the first end surface is S1, the area of the second end surface is S2, and S2/S1 is larger than or equal to 0 and smaller than or equal to 0.75; when S2/S1 = 0, the top, far away from the disc surface, of the protruding piece is provided with a sharp angle A, and A is larger than or equal to 10 degrees and smaller than or equal to 120 degrees. No chippings are generated when the collector plate and the tab are assembled.