Abstract: A method for manufacturing a safety vent on a cover of a lithium-ion battery has punching the cover to form an annular recess and the cover made of aluminum alloy; heating the annular recess to a temperature between 200° C.˜500° C.; cooling the annular recess; and obtaining the safety vent on the cover of the lithium-ion battery.
Abstract: A nail-cleaning tool has a rod, a removing end, a scraping end and a sheath. The scraping end is spatula-shaped. The sheath is an absorbent material mounted over the removing end. Therefore, users can use the removing end to absorb nail polish remover then clean a surface of the nail during removal and application. The users can further use the scraping end to scrap an edge of each nail adjacent to skin. Therefore, the nail can be cleaned thoroughly while minimizing waste and reducing direct skin contact with the nail polish remover.