BATTERY

A battery, including an electrode assembly and a packaging bag configured to accommodate the electrode assembly, where the packaging bag includes a nylon layer, the nylon layer includes a coloring material, an average of color difference values L of the nylon layer is greater than or equal to 6 and less than or equal to 12, and a standard deviation of the color difference values L of the nylon layer is σ and satisfies σ≤0.2. The nylon layer includes the coloring material, and during fabrication of the nylon layer, through adjusting an amount of the coloring material and a thickness of a nylon material, a color difference of the nylon layer can be adjusted.