Waterproof lithium ion battery

The utility model discloses a waterproof lithium ion battery. The lithium ion battery comprises a shell, a battery cell, a positive electrode pin, a negative electrode pin and a packaging cover, the packaging cover is a transparent silica gel cover. A first annular groove is formed in the outer wall of the packaging cover; the inner wall of the shell seals the first annular groove; a positive electrode hole and a negative electrode hole are formed in the packaging cover; the positive electrode guide pin penetrates through the positive electrode hole; a second annular groove is formed in the inner wall of the positive electrode hole; wherein the first annular groove is sealed by the outer wall of the positive electrode pin, the second annular groove is sealed by the outer wall of the positive electrode pin, the negative electrode pin penetrates through the negative electrode hole, a third annular groove is formed in the inner wall of the negative electrode hole, the third annular grooveis sealed by the outer w