Lithium ion power battery

The utility model discloses a lithium ion power battery which comprises a shell, a central reel is arranged in the shell, a battery cell is wound on the outer wall of the central reel, a positive pole plate and a negative pole plate are respectively arranged at two ends of the battery cell, and a positive pole column and a negative pole column with convex parts are respectively welded and fixed on the positive pole plate and the negative pole plate. And the convex part extends into the central reel, so that the positive pole post, the negative pole post and the battery cell are fixed. According to the lithium ion power battery provided by the utility model, the volume energy of the single battery is relatively low, and the thread structures of the positive pole and the negative pole of the existing battery are arranged into the laser welding boss structures, so that the volume energy density and the mass energy density of the single battery are improved; the defect of a single battery grouping process is impr