SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a secondary battery having both of an excellent battery characteristic under a low temperature environment and high reliability under overcharging.SOLUTION: A secondary battery 50 comprises an electrode body 10 which is configured so that a positive electrode and a negative electrode are stacked through a separator and then wound around an axial core 12, and electrolytic solution. The separator has a shutdown function. The axial core 12 has a metal material which develops an endothermal reaction in a temperature area which is not less than the shutdown temperature of the separator and lower than the thermal decomposition temperature of the positive electrode. The surface of the axial core 12 is coated with resin material having lower thermal conductivity than the metal material.SELECTED DRAWING: Figure 1