A battery module includes a housing that includes an internal space, a cell stack accommodated in the internal space and including a plurality of battery cells stacked in a first direction and a plurality of thermal blocking members disposed between battery cells in the plurality of battery cells, a plurality of electrically conductive members electrically connected to the plurality of battery cells, and a frame supporting the plurality of electrically conductive members. Each battery cell includes an electrode assembly and an electrode accommodating portion accommodating the electrode assembly. At least one of the thermal blocking members includes: a body portion configured to face the electrode accommodating portion and blocking heat propagation between the plurality of battery cells, and one or more blocking portions extending from the body portion in a second direction perpendicular to the first direction, and configured to at least partially block gas flow in the first direction.