Lithium battery with negative electrode protection structure

The utility model discloses a lithium battery with a cathode protection structure, which comprises a lithium battery body, a cathode bump is arranged at the end part of the lithium battery body, a convex ring is outwards arranged at the end part of the cathode bump, a lithium battery cathode is inserted into the convex ring, a rubber sleeve is sleeved on the peripheral surface of the cathode bump, and the rubber sleeve is sleeved on the peripheral surface of the cathode bump. The rubber sleeve extends along the length direction of the negative pole lug, and the end part of the rubber sleeve is narrowed and covers the joint of the convex ring and the negative pole of the lithium battery. According to the utility model, the rubber sleeve is firmly sleeved on the cathode bump, the cathode bump is used for protecting the peripheral surface of the cathode, and the rubber sleeve is used for forming buffer protection on the cathode bump and the edge of the end surface of the cathode, so that the internal electric co