Lithium ion battery and manufacturing method thereof

The invention relates to a lithium ion battery which comprises a cell (1) and a shell (2) containing same. The front end of the cell (1) is connected with a protective plate (3) and a top cover (4), the top cover (4) and the shell (2) are connected through fasteners, and the shell (2) is a plastic shell. With respect to the conventional art, the top cover (4) and the shell (2) are connected and assembled through fasteners, few workstations are thus required to complete the assembly of the whole shell, the structure of the lithium battery is simplified, labor and time are greatly saved, and the production efficiency is improved. The shell body is light and thin, so that the maximum capacity of the battery is realized based on light weight. A method for manufacturing the lithium ion battery is also discloses.