Power battery shell with self-locking positioning function and combined power battery shell

The utility model discloses a power battery shell with a self-locking positioning function and a combined power battery shell. The shell comprises a shell body, the shell body comprises a lower shelland an upper shell which are integrally formed, a spigot of the upper shell is connected to the lower shell in a matched mode, the lower shell is composed of a first side face, a second side face opposite to the first side face, a third side face connected between the first side face and the second side face and a bottom face, and the upper shell is a top cover; wherein the top cover is provided with a positive pole and a negative pole which are respectively led out from the positive pole plate and the negative pole plate, the first side surface and the second side surface are rectangular, bosses are uniformly distributed on the first side surface and the second side surface, clamping grooves and convex buckles are respectively arranged on diagonal lines of the first side surface and the second side surface, and t