Patent ID: 8420248

Claim:
An electrode assembly of a secondary battery comprising: a positive electrode plate comprising a positive electrode active material applied to a positive electrode collector, wherein a first positive electrode non-coating portion is formed on a winding end of the positive electrode plate, and a second positive electrode non-coating portion is formed on an end of the positive electrode plate opposite the winding end; a negative electrode plate comprising a negative electrode active material applied to a negative electrode collector; a separator disposed between the positive electrode plate and the negative electrode plate; and a ceramic layer to prevent a short-circuit between the positive electrode plate and the negative electrode plate, disposed along the positive electrode plate, and extending from the winding end of the positive electrode plate, along between about 40% and about 90% of the length of the positive electrode plate, wherein the winding end is located at an outer ring of the electrode assembly, and the positive electrode plate, the negative electrode plate, the ceramic layer, and the separator are wound together.