GAS MEASUREMENT METHOD AND DEVICE UTILIZING THIS METHOD

摘要

PROBLEM TO BE SOLVED: To measure gas generated in a cell of a secondary battery with high accuracy. SOLUTION: In a sealed space having a known volume, this is equipped with a vacuum process to make the space as a vacuum atmosphere in a state that the cell of the secondary battery is housed, an exhaust process in which the inner gas is exhausted into the open air by disassembling the cell, a gas volume measurement process in which the filled gas pressure is measured and the gas volume under the atmospheric pressure is calculated from this gas pressure and the space volume, and a component measurement process in which gas components are measured after adding a dilution gas to the gas.