The utility model relates to the field of lithium ion batteries, and discloses a shell for a button lithium ion battery and a button laminated lithium ion battery, the shell comprises a first pole shell comprising a first annular shell sheet, an opening is formed at the tail end of the first annular shell sheet, and a first end cover is plugged at the other end part of the first annular shell sheet; The second pole shell comprises a second annular shell piece, an opening is formed in the tail end of the second annular shell piece, and the other end of the second annular shell piece is blockedby a second end cover; The insulation sealing ring comprises a first annular insulator and a second annular insulator surrounding the first annular insulator, and the first annular insulator and the second annular insulator are integrally designed; The sealing ring is sleeved on the second annular shell sheet; the second annular shell sheet is sleeved on the first annular insulator; Between the second annular insulators, Openings of the first pole shell and the second pole shell are oppositely connected in a sleeved mode to form a sealed cavity, the first annular shell piece and the second annular shell piece are connected in parallel in a sleeved mode, and the insulating sealing rings are arranged between the first annular shell piece and the second annular shell piece and between the tail end of the first annular shell piece and the second end cover at intervals. By applying the technical scheme, the capacity of the button lithium ion battery can be improved.