The invention relates to the field of lithium ion batteries, and discloses a button lithium ion battery, a shell thereof and a buckle type laminated lithium ion battery. The shell comprises a first pole shell comprising a first annular shell sheet, an opening is formed at the end thereof, and a first end cap is sealed at the other end thereof. A second pole shell comprising a second annular shellsheet having an opening formed at an end thereof and a second end cap sealed at the other end; An insulating sealing ring including a first annular insulator and a second annular insulator surroundingthe first annular insulator; The sealing ring is sleeved on the second annular shell, and the second annular shell is sleeved between the first annular insulator and the second annular insulator, andthe first pole shell and the second pole shell are oppositely sleeved and connected to form a sealed cavity, and the first annular shell and the second annular shell are sleeved in parallel. The application of the technical scheme is conducive to improving the capacity of the buckle type lithium ion battery.