Lithium-ion battery

A lithium-ion battery, comprising an anode plate, a cathode plate, a separator and electrolyte, wherein the separator is arranged between the anode plate and the cathode plate, the anode plate comprises an anode current collector and an anode active material layer, the anode current collector is provided with an anode coating area and an anode blank area, and the anode active material layer is coated on the anode coating area;

• the cathode plate comprises a cathode current collector and a cathode active material layer, the cathode current collector is provided with a cathode coating area and a cathode blank area, and the cathode active material layer is coated on the cathode coating area, wherein when both the anode blank area and the cathode blank area are coated with a polymer layer, the two polymer layers are mutually contacted;
• when one of the anode blank area and the cathode blank area is coated with a polymer layer, the polymer layer is contacted with the other blank area.