Torsion testing device and method for sealing performance of cylindrical battery cap

The invention discloses a torsion testing device and method for the sealing performance of a cylindrical battery cap, and relates to the technical field of battery production and detection.The torsion testing device comprises a bottom plate and a battery cell, guide columns are fixedly connected to the four corners of the top of the bottom plate, and the top ends of the four guide columns are fixedly connected with the same top plate; the four guide columns are sleeved with the same movable plate in a sliding mode, an upper clamp is arranged on the top plate, and the upper clamp is matched with the movable plate. The top of the bottom plate is rotatably connected with a turntable connecting shaft, the top end of the turntable connecting shaft is rotatably connected with a turntable, the top of the turntable is provided with a mounting groove, a permanent magnet is fixedly mounted in the mounting groove, and the top end of the turntable connecting shaft is fixedly mounted at the bottom of the permanent magnet;