The invention discloses a housing end cover assembly of a supercapacitor and a power battery, include a front side and a rear side, rear side, a housing body composed of a right side surface and a bottom surface, the shell body is provided with a plurality of pressure grooves, each corner of the four corners of the front side and the four corners of the rear side is provided with a bump 1, The upper part of the front side and the upper part of the rear side are provided with a plurality of grooves, the upper end of the shell body is connected with an end cover, the end cover comprises an end cover body, left and right sides of the end cover body are respectively connected with a positive electrode aluminum plate and a negative electrode aluminum plate, and the middle part of the end coverbody is provided with an explosion-proof valve mounting hole. The casing of the invention has the advantages of good heat dissipation performance, and when gas is accumulated in the casing of the capacitor and the power battery, the gas can expand outwardly against the pressure slot, thereby preventing the casing of the capacitor and the power battery from bulging to cause explosion, thereby improving the service life and strength of the capacitor and the power battery.