A battery pole piece protective bracket n is entirely of a cylindrical shape. A wire passage is defined in the battery pole piece protective bracket and is axially extended through the same. At least one end surface of the battery pole piece protective bracket is provided with a protective trough recessed from the end surface for preventing contact of the battery pole piece with an external element thus further avoiding short circuit. By using entirely cylindrical shaped and axially extended wire passage, and by using a protective trough recessed from one end surface for preventing contact of the battery pole piece with an external element thus further avoiding short circuit, the battery pole piece is good insulated from external environment, no risk of short circuit exists, there is no need for attaching high temperature resistant adhesive tape or applying electric hot melt adhesive, and electronic cigarette assembling rate is increased.