The invention relates to the field of
lithium ion batteries, and discloses a button type
lithium ion battery and a shell. The shell comprises: a negative
electrode shell comprising a negative
electrode top cover and a negative
electrode shell wall, and the negative electrode shell wall surrounds the edge of the negative electrode top cover, is perpendicular to the negative electrode top cover andis located on one surface of the negative electrode top cover; the sealing ring is sleeved on the negative electrode shell; the positive electrode shell comprises a positive electrode top cover and apositive electrode shell wall, and the positive electrode shell wall surrounds the edge of the lower bottom shell, is perpendicular to the positive electrode top cover and is located on one surface ofthe positive electrode top cover; wherein the
anode shell wall is sleeved outside the
cathode shell wall, the sealing ring is arranged between the
anode shell and the
cathode shell at intervals, thetail end of the
anode shell wall is an anode shell thick-wall annular section, the anode shell thick-wall annular section is bent and pressed outside the anode shell to form an annular seal, and the wall thickness of the anode shell thick-wall annular section is greater than that of other positions of the anode shell. By adopting the technical scheme, the
air tightness of the shell is ensured on the basis of improving the capacity of the button
lithium ion battery.