<p>A battery module (200) comprises: a plurality of unit cells respectively further comprising discharge units which eject gas which is emitted within the cells; a heat transmission member (220) further comprising a plurality of cylindrical housing units which house the plurality of unit cells; and a lid body (270) which covers the discharge units of the plurality of unit cells and forms an internal space with the heat transmission member (220). The discharge units communicate with the internal space. The heat transmission member (220) further comprises a ventilation path between the plurality of housing units which is parallel to the axial direction of the housing units. One end side of the ventilation path communicates with the internal space, and the other end side thereof communicates with the outside.</p>
