The utility model discloses a
lithium battery top cover structure, which relates to the technical field of
lithium batteries, comprises a top cover provided with an explosion-proof hole, and is characterized in that the explosion-proof hole is sequentially provided with a protective cover, an explosion-proof membrane and a deformation layer from top to bottom, and the protective cover, the explosion-proof membrane and the deformation layer are all connected onto the top cover; the surface of the protective cover is provided with air holes, the deformation layer is of a downward arched structure, the deformation layer comprises a first
metal layer and a second
metal layer arranged on the first
metal layer, the
thermal expansion coefficient of the first metal layer is larger than that of the second metal layer, and the
thermal expansion coefficient of the second metal layer is larger than that of the first metal layer. A plurality of sharp knives are uniformly distributed on the surface of the second metal layer; according to the utility model, the safety reaction can be performed at the initial stage of battery heating, the corresponding reaction can be continuously performed according to the heating condition of the battery, the
accident risk of battery heat is effectively avoided, the structure is simple, and the
safety coefficient is higher.