POWER STORAGE APPARATUS

The storage battery cell unit includes a lower battery module including a plurality of battery cells, an upper battery module including a plurality of battery cells, a battery module case for housing the lower battery module and the upper battery module, and an upper battery module floor configured to divide an internal space of the battery module case into an upper housing space for housing the upper battery module and the lower housing space for housing the lower battery module. A gap is formed in the upper battery module floor for releasing gas generated in one of the upper housing spaces or the lower housing space to the other one of the housing spaces.