Connecting structure for testing hard-shell lithium ion battery

The utility model discloses a connecting structure for testing a hard-shell lithium ion battery. The connecting structure comprises a battery shell and a connecting piece, an anti-explosion hole is formed in the surface of the battery shell; the connecting piece comprises a circular sealing piece and a protruding column arranged on one end face of the sealing piece, and the connecting piece is provided with a gas channel penetrating through the sealing piece and the protruding column in the axial direction. The other end face of the sealing piece is connected to the periphery of the anti-explosion hole in a sealed mode, and the anti-explosion hole is communicated with the gas channel. And the convex column is used for hermetically connecting an air pressure transmitter. The end face of the sealing piece is connected to the periphery of the explosion-proof hole in a sealed mode, the connecting piece is connected with the battery shell in a sealed mode, the protruding column can be connected with the air pressu