Aluminum shell cylindrical battery with directional pressure relief at bottom

The utility model relates to the field of batteries, in particular to an aluminum shell cylindrical battery with directional pressure relief at the bottom. The collector comprises a top cover part, abottom cover part, a side wall, a pole group, an upper collector plate and a lower collector plate, wherein the top cover part, the bottom cover part and the side wall define a battery shell, the upper current collecting disc is arranged at the lower end of the top cover part, the lower current collecting disc is arranged at the upper end of the bottom cover part, and a pole group is arranged in acavity defined by the upper current collecting disc, the lower current collecting disc and the side wall. When the internal pressure of the battery exceeds a set value, internal gas passes through the aluminum pore plate and acts on the thin aluminum sheet, so that the thin aluminum sheet deforms towards the outside of the battery, a current path between the bottom cover and the aluminum pore plate is disconnected, all ch