METHOD FOR MANUFACTURING SECONDARY BATTERY, SECONDARY BATTERY, ENERGY STORAGE SYSTEM, AND ELECTRIC DEVICE

A method for manufacturing a secondary battery, a secondary battery manufactured by the method, an energy storage system, and an electric device are provided. The method includes: providing an electrode sheet; measuring an actual porosity of the electrode sheet; determining whether the electrode sheet is qualified based on the actual porosity of the electrode sheet; in response to the electrode sheet being determined to qualified, forming the secondary battery using the electrode sheet; in response to the electrode sheet being determined to be unqualified, performing laser processing to form laser-formed pores on the electrode sheet, and repeating the measuring operation and the determining operation until the electrode sheet is qualified. In this way, the uniformity of electrode sheet porosity is improved, the wettability of the electrode sheet is enhanced, and the electrical performance of the secondary battery is improved.