Abstract: This application discloses a battery cell, a battery, and an electric apparatus. The battery cell includes an electrode assembly. The electrode assembly includes a positive electrode plate, a negative electrode plate, a separator, an insulation layer, and an adhesive layer. The positive electrode plate, the separator, and the negative electrode plate are stacked and wound, and the electrode assembly has bent regions. At least a portion of the insulation layer and at least a portion of the adhesive layer are disposed in the bent region, and the insulation layer is adhered to the positive electrode plate or the negative electrode plate through the adhesive layer. In a thickness direction of the insulation layer, a projected area of the adhesive layer is smaller than a projected area of the insulation layer.

Abstract: This application discloses a battery cell, a battery, and an electric apparatus. The battery cell includes at least one electrode assembly. The electrode assembly includes a positive electrode plate, a negative electrode plate, a separator, and a porous insulation layer. The positive electrode plate, the separator, and the negative electrode plate are stacked and wound. At least a portion of the porous insulation layer is disposed in a bent region of the electrode assembly, and the porous insulation layer is disposed between the positive electrode plate and the separator or disposed between the negative electrode plate and the separator. Based on the above structure, the service life of the battery cell can correspondingly be prolonged, and the safety of the battery cell can correspondingly be improved.

Abstract: This application provides an expansion tape for battery packaging, where the expansion tape includes a substrate, an expansion layer, and a primer layer. The substrate has opposite first surface and second surface. The expansion layer is provided on the first surface of the substrate. The expansion layer includes an organic adhesive and a temperature expansion material. The temperature expansion material is a material capable of volume expansion after heat treatment. The primer layer is provided on the second surface of the substrate. The primer layer has adhesion.

Abstract: A primer adhesive for a dry electrode includes following components in parts by mass: 30-70 parts of a modified polyolefin resin and 10-60 parts of a conductive material, where the modified polyolefin resin is a copolymer formed by polymerization of maleic anhydride, polyolefin, and a petroleum resin.