Casing of lithium ion battery

The invention relates to a battery, in particular to a casing of a lithium ion battery. The casing comprises an outer casing, a cover plate base plate and two rivet holes, wherein an insulation gasket is arranged under the cover plate base plate; pole lug welding bases are respectively arranged at the left side and right side of the lower part of the insulation gasket, and aluminum rivet blocks are respectively arranged under the two pole lug welding bases; the two river holes sequentially penetrate through the cover plate base plate, the insulation gasket, the pole lug welding bases and the left and right aluminum rivet blocks in the vertical direction; two bolts are respectively arranged on each of the two aluminum rivet blocks; an insulation sealing gasket is arranged between each bolt and the corresponding aluminum rivet block; the pole lug welding bases and the bolts are respectively made of copper or aluminum, and a rivet is arranged in each rivet hole. The casing of the lithium ion battery has the adva