SECONDARY BATTERY

摘要

In order to increase battery capacity and high-energy density, operation of a safety valve is definitively performed within the limited internal battery space of a large-capacity secondary battery having excellent safety for quickly discharging gas produced within the battery. The present invention is a high-capacity secondary battery with a battery capacity of 100Ah or greater and having a cleavage valve (10) formed in a manner such that the opening pressure thereof is a value between 0.2 and 1.5MPa. The region (safety valve region) in which the cleavage valve (10) is provided has the cleavage valve (10) configured in a manner such that each 1Ah of battery capacity has an area of 0.025-0.066cm2.