The utility model relates to an overvoltage protection electricity core, including square aluminum hull, wrap up aluminum cover board on square aluminum hull of electric core main part in square aluminum hull, fixed connection, set up positive pole and negative pole and anodal connecting plate and negative pole connecting plate on aluminum cover board, being connected with the metal on the positive pole and visiting the board, its lower extreme terminal surface of aluminum cover board is provided with visits the corresponding thin metal shell fragment of board with the metal, and the negative pole connecting plate includes that the negative pole upper plate be connected with the negative pole and one end passes through the fuse and connect in the negative pole hypoplastron of electric core main part with the other end that the negative pole upper plate is connected. The utility model discloses an overvoltage protection electricity core, the thin metal shell fragment of electricity core continuation work when being used for preventing through the setting that electric core internal pressure from rising, when electric core take place to overcharge or other can arouse the situation that electric in -core portion atmospheric pressure rises the time, thin metal shell fragment epirelief put through the metal of connecting in the positive pole visit the board and then and make electric core it is anodally put through with the negative pole is direct, fuse on the negative pole connecting plate that fuses guarantees that electric core is safe in utilization.