The present application relates to the field of Li-ion battery production technologies and, particularly, relates to a top cover of a power battery and the power battery. The top cover plate of a power battery includes a top cover plate, a first electrode unit and a second electrode unit, the top cover plate is provided with a deformable plate connecting hole and a first connecting portion integrated with the top cover plate as a whole, the first electrode unit includes the deformable plate, a conductive plate and an insulation piece, the insulation piece is provided with a second connecting portion and a conductive plate connecting portion, the deformable plate seals the deformable plate connecting hole, the conductive plate is located underneath the deformable plate, and is electrically connected with the deformable plate, the insulation piece is fixed underneath the top cover plate through cooperation of the first connecting portion and the second connecting portion, the conductive plate is insulated from and fixed with the top cover plate through the conductive plate connecting portion. The power battery includes the top cover of the power battery. The power battery provided by the present application can effectively prevent breaking, losing efficacy or deformation of the conductive plate during the using process.