A plurality of end cap fixing cylinders 401 are integrally disposed on the end shell 400. In FIG. 4, the base fixing cylinders 110 integrally disposed on the base shell 100 are in one-to-one correspondence with the end cap fixing cylinders 401, so as to be fixedly connected by bolts. In FIG. 4, the base insertion edge 112 integrally disposed on the base shell 100 is inserted into the end shell 400, for further fixing. In FIG. 4, the base buckle 111 disposed on the side of the base shell 100 close to the end cap assembly 4 and the end cap snap block 402 on the end shell 400 are snap-fitted with each other, thereby implementing preliminary fixing.

Referring to FIGS. 8 and 9, the locking assembly 5 includes a locking block 500, a locking cover 501, a locking tab 502, a locking slider 503, a locking sliding cylinder 504, a locking sliding column 505, a locking pressure spring 506, and a locking indicator block 507.

The locking block 500 slides on the base shell 100 and locks the lithium battery pack. The locking sliders 503 symmetrically disposed on the base shell 100 are positioned in a locking sliding groove 509, and the locking block 500 is provided with a movement locking groove 510 for the locking slider 503 to slide up and down.