Small lithium battery for offshore operation equipment

The utility model discloses a small-sized lithium battery for offshore operation equipment. The small-sized lithium battery comprises a lithium battery cell and a first protective cover, a mounting groove is formed in the first protective cover; the lithium battery cell is inserted into the mounting groove; the side face of the first protection cover communicates with the mounting groove and is fixedly connected with a wire leading-out pipe. A second protection cover is inserted into the mounting groove in a sealing manner; the second protective cover is fixedly connected with a first communicating pipe in a communicating manner; the first communicating pipe is inserted into the second communicating pipe; the second communicating pipe is fixedly connected to the first protective cover in a communicating manner; the lithium battery cell is comprehensively protected by the third protection cover, the first protection cover and the second protection cover, so that the lithium battery cell has higher falling and