NOVELTY - The pressure chamber comprises a receiving space formed in an inner portion of the pressure chamber, and an upper chamber forming the receiving space. First and second edge portions of the upper chamber are coupled to a lower chamber. The first edge portion is pressed against a distal end of a sealing body that is arranged on a side of a bending pattern of a first sealing member. The first sealing member sticks to the inner side of a second edge portion of the lower chamber and is implemented as an O-ring structure in which a central part is opened.    USE - The pressure chamber is useful for a secondary battery (claimed) that is useful in a power tool, an electric vehicle, an electric commercial vehicle, an electric bike, an electric scooter, electric golf cart, and an electric truck consisting of a plug-in hybrid electric vehicle and a hybrid electric vehicle, where the battery is a secondary lithium ion battery.    ADVANTAGE - The pressure chamber has improved sealing force, improves an impregnation property in a main-liquid of the secondary battery, and enhances service life and operational performance of the secondary battery.    DETAILED DESCRIPTION - The pressure chamber comprises a receiving space formed in an inner portion of the pressure chamber, and an upper chamber forming the receiving space. First and second edge portions of the upper chamber are coupled to a lower chamber. The first edge portion is pressed against a distal end of a sealing body that is arranged on a side of a bending pattern of a first sealing member. The first sealing member sticks to the inner side of a second edge portion of the lower chamber and is implemented as an O-ring structure in which a central part is opened. The bending pattern of the top surface of the sealing body is pressurized if the pressing of the first rim portion is bent toward a first inclination angle of a first wing portion. The second edge portion of the upper chamber is present in close contact with an inner surface of a second wing part. The first wing part comprises a protrusion part protruded over a horizontal plane in which a top surface of the sealing body is comprised. The first inclination angle is right angle or obtuse angle. The protrusion part forms a second inclination angle and an obtuse angle with the surface of the sealing body. The pressure chamber further comprises a second sealing member arranged between the first edge portion of the upper chamber and an inner surface of the lower chamber. The second sealing member is O-ring structure and sticks to the inner side of the second edge portion of the lower chamber. The first sealing member has a hardness of 45-55.