Battery cell packaging aluminum-plastic membrane, preparation method thereof, and battery

The invention relates to a battery cell packaging aluminum-plastic membrane, which comprises an aluminum-plastic membrane body, and a coating(s) is/are coated on a first surface or/and a second surface of the aluminum-plastic membrane body. Each coating is prepared from a phase-change material with double phase-change points. The battery cell packaging aluminum-plastic membrane provided by the invention has phase-change characteristics of two phase-transition temperature zones of high-temperature phase change and low-temperature phase change, so that compared with an aluminum-plastic membranecoated with a single phase-chage point material, the battery cell packaging aluminum-plastic membrane provided by the invention has a sensitive high temperature and low temperature double-adjustment ability, a surface temperature range of a battery cell is remarkably reduced, and the battery cell is protected to work normally. The invention also comprises a method for preparing the battery cell packaging aluminum-plastic