The invention provides a battery component which comprises a battery main body, auxiliary devices on two sides of the battery main body and a loop antenna which is arranged on the battery main body and is in a surrounding shape formed by a continuous transmission line from outside to inside, wherein the battery main body comprises a front side, a back side opposite the front side and a lateral side connected with the front side and the back side; the loop antenna comprises a first output terminal, a surrounding portion extending from the first output terminal and a second output terminal extending from the surrounding portion, and the first output terminal and the second output terminal are placed on the lateral side; the surrounding portion comprises a first portion and a second portion and a third portion which extend from two ends of the first portion, the first portion is arranged on the lateral side of the battery main body, the second portion is arranged on the front side, and the third portion is arranged on the back side of the battery main body. The antenna of the battery component is easy to weld with external circuits.