Cylindrical battery with charging and discharging protection circuit

The utility model belongs to the technical field of batteries, and particularly relates to a cylindrical battery with a charging and discharging protection circuit, which comprises a cylindrical metalshell, a battery cell arranged in the metal shell, a positive electrode cap, a negative electrode cap arranged in one end part of the metal shell, a protection circuit board, a positive electrode tray and a sealing ring, the negative electrode cap, the positive electrode tray and the sealing ring are coaxial with the metal shell; the positive electrode tray is arranged on one surface of the protection circuit board, the positive electrode tray and the protection circuit board are sleeved with the sealing ring, and the outer wall of the sealing ring makes contact with the inner wall of the metal shell. The anode cap is arranged on the other surface of the protective circuit board, and the free end of the anode cap penetrates through the cathode cap and then is located outside the metal shell. Compared with an exis