NON-AQUEOUS ELECTROLYTIC SECONDARY BATTERY

摘要

Provided is a secondary battery using organic solvent electrolyte which possibly prevents thermal influx at both cases when the battery is abnormally heated or overcharged. In the secondary battery using the organic solvent electrolyte where cathode, anode and two kinds of separators are laminated and an electrode wound body formed by winding again and the organic solvent electrolyte are included, the electrode wound body is characterized by using a first separator with 400sec/100cm^2 in a match degree around outer circumference of the cathode and a second separator with below 30% in thermal contraction rate around inner circumference of the cathode.