Patent ID: 8691419

Claim:
A cylindrical secondary battery, comprising: a wound electrode assembly comprising a cathode plate, an anode plate, and a separator interposed between the cathode and anode plates; a ceramic layer coated on at least one of the cathode and anode plates, having a thickness of more than 6.0 μm, wherein the ceramic layer is in direct contact with the separator, the ceramic layer comprising at least one material selected from the group consisting of: silica (SiO 2 ), alumina (Al 2 O 3 ), zirconium oxide (ZrO 2 ), and mixtures thereof; and insulating nitrides, hydroxides, and ketones, of zirconium, aluminum, silicon, or titanium, and mixtures thereof; a center pin inserted into the center of the electrode assembly, having a wall thickness of 0.05 mm to 0.1 mm; and a cylindrical can to house the electrode assembly.