POLISHED ALUMINUM SHEET FOR LITHIUM BATTERY, TOP COVER, AND LITHIUM BATTERY

The present application relates to the technical field of lithium battery structures, in particular to a polished aluminum sheet for a lithium battery, a top cover, and a lithium battery. The polished aluminum sheet for a lithium battery comprises: a polished aluminum sheet body provided with an explosion-proof hole suitable for mounting an explosion-proof valve therein; a first reinforcing portion protruding or recessed from one surface of the polished aluminum sheet body and continuously or discontinuously surrounding the explosion-proof hole, the first reinforcing portion being spaced apart from the explosion-proof hole; and a second reinforcing portion protruding or recessed from the other surface of the polished aluminum sheet body and continuously or discontinuously surrounding the explosion-proof hole, the second reinforcing portion being spaced apart from the explosion-proof hole. According to the polished aluminum sheet for a lithium battery, the top cover, and the lithium battery which are provided in the present application, the local strength at the position on the polished aluminum sheet where the explosion-proof valve is mounted can be enhanced, such that the explosion-proof valve is prevented from deforming.