Battery sealing inspection method

摘要

A battery (1) which has undergone initial charging and discharging is placed inside a sealed vessel (3), which is evacuated by a vacuum pump (9). After this evacuated state has been maintained for a while, the density of hydrogen gas within the sealed vessel (3) is measured by a hydrogen density sensor (11), based on which the presence or absence of a gas escape from the battery is determined. The battery may be heated instead of subjecting it to charging and discharging.