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|1. (WO2013125305) SEALED NONAQUEOUS ELECTROLYTE SECONDARY BATTERY|
|Applicants:||TOYOTA JIDOSHA KABUSHIKI KAISHA
|Title:||SEALED NONAQUEOUS ELECTROLYTE SECONDARY BATTERY|
Provided is a sealed nonaqueous electrolyte secondary battery, which is equipped with a current blocking mechanism that is actuated by an increase in the internal pressure of a battery case, and wherein the mechanism quickly and stably operates at the time of overcharging. This sealed nonaqueous electrolyte secondary battery is obtained by having a battery case contain an electrode body, in which a positive electrode (10) and a negative electrode face each other with a separator interposed therebetween, an electrolyte and an overcharge inhibitor. The positive electrode (10) is provided with a positive electrode collector (12) and a positive electrode active material layer (14) that is formed on the collector and contains a positive electrode active material as a main component. In addition, a conductive material layer (16), which contains a conductive material as a main component, is formed between the positive electrode active material layer (14) and the separator, and the conductive material layer (16) has a porosity of from 35% to 55% (inclusive).