A connecting plug 205 is mounted on one side of the connecting box 200 away from the lithium battery pack 3, and the connecting box 200 is provided with a connecting receptacle 210 for inserting and limiting the connecting plug 205. The connecting plug 205 is fitted with a connecting conductive sheet 206, and the connecting conductive sheet 206 and the lithium battery pack 3 communicate with each other, thereby realizing electrical conduction.

A connection mounting cover 208 for covering the connecting plug 205 is further mounted on the mounting box, a connection positioning strip 207 is integrally provided on one side of the connecting plug 205 away from the connecting box 200, and a connection positioning groove 211 for mounting the connection positioning strip 207 is provided on the connection mounting cover 208.

Referring to FIGS. 7 and 8, the end cap assembly 4 includes an end shell 400, an end cap fixing cylinder 401, an end cap snap block 402, an end cap charging head 403, an end cap mounting plate 404, an end cap positioning post 405, an end cap mounting box 406, and an end cap plug 407.