Detachable lithium ion battery

The utility model discloses a detachable lithium ion battery which comprises a tubular shell and a battery cell, one end of the shell is provided with a shell opening, the battery cell is provided with a positive electrode lead needle and a negative electrode lead needle, the free ends of the positive electrode lead needle and the negative electrode lead needle extend towards the shell opening, an adhesive piece and a PCB cover plate are arranged in the shell opening, the adhesive piece is used for sealing the shell opening, and the PCB cover plate is used for covering the shell opening. A first wire and a second wire are arranged on the side, away from the gluing piece, of the PCB cover plate, the first wire is electrically connected with one of the positive electrode pin and the negative electrode pin, the second wire is electrically connected with the other one of the positive electrode pin and the negative electrode pin, the first wire is provided with a first contact, the first contact is located at the