Top cover, cover cap assembly and battery

The utility model provides a top cover, a cover cap assembly and a battery. The top cover comprises a supporting outer ring, at least two slope angle connecting pieces and an external welding piece which are connected in sequence, and a pressure relief channel for pressure relief is formed between every two adjacent slope angle connecting pieces; the plane where the supporting outer ring is located is defined as a slope angle reference plane, each slope angle connecting piece comprises a vertical extending part and a slope angle extending part, the slope angle extending parts are connected to the vertical extending parts and the external welding pieces respectively, and the ends, away from the slope angle extending parts, of the vertical extending parts are connected to the supporting outer ring. A slope angle is formed between the surface extension direction of the end part, connected to the vertical extension part, of the slope angle extension part and the slope angle reference surface, and the slope angle