BATTERY PACK AND AIRCRAFT

In a battery pack, a housing includes an exhaust portion provided on an upper side in a gravity direction with respect to a housing portion that houses a live part. The exhaust portion includes: a storage portion configured to store a liquid; a first communication portion that communicates between an interior of the housing portion and an interior of the exhaust portion; and a second communication portion that communicates between an outside of a housing and an inside of the exhaust portion. When the battery pack is viewed from the upper side in the gravity direction, an opening of the second communication portion on an inner side of the exhaust portion is provided at a position that overlaps the storage portion and that does not overlap an opening of the first communication portion on the inner side of the exhaust portion.