Battery pack

A battery pack comprising:

• a battery block including a plurality of battery cells and a lead plate connecting the plurality of battery cells to one another, each of the plurality of battery cells including an exhaust valve;
• and
• a cover disposed on an outer periphery of the battery block, the cover including a gas exhaust port configured to exhaust an ejection substance from the exhaust valve to outside, wherein
• in the battery block, the plurality of battery cells are parallel to one another, the plurality of battery cells have respective electrode end surfaces disposed in a same direction, and the lead plate is connected to the respective electrode end surfaces,
• the lead plate has a transmission gap configured to allow the ejection substance to transmit through the transmission gap,
• the cover includes an outer peripheral wall disposed at a periphery of the battery block, a closing plate closing an opening of the outer peripheral wall, and an exhaust duct disposed between the closing plate and the battery block, the exhaust duct being configured to exhaust the ejection substance,
• the exhaust duct is partitioned into a spreading duct and an outer peripheral duct by a partition rib,
• the partition rib demarcates the outer peripheral duct along an outer periphery of the spreading duct and has a communication opening therein configured to allow the ejection substance to flow from the spreading duct to the outer peripheral duct, and
• the gas exhaust port is configured to exhaust the ejection substance from the exhaust valve of the each of the plurality of battery cells passing through the transmission gap of the lead plate, the spreading duct, and the outer peripheral duct, and is exhausted to outside from the gas exhaust port of the cover.