SECONDARY BATTERY AND ELECTRONIC DEVICE

The invention discloses a secondary battery and an electronic device. The secondary battery comprises an electrode assembly, a packaging bag and a first bonding piece, the electrode assembly comprises a positive pole piece, a diaphragm and a negative pole piece which are wound. The ending end of the positive pole piece and the ending end of the diaphragm exceed the ending end of the negative pole piece, and the part, exceeding the negative pole piece, of the positive pole piece is provided with a first empty foil area. And the outermost ring of the first straight section comprises a layer of first empty foil area. The inner ring of the first straight section comprises a positive pole piece close to the first empty foil area and at least one layer of diaphragm positioned between the first empty foil area and the positive pole piece. The ending end of the first empty foil area is located on the second straight section. The electrode assembly is accommodated in the packaging bag. The first bonding piece comprise