A battery module effectively prevents the occurrence or spread of fire. The battery module includes a cell assembly including a plurality of secondary batteries stacked on each other; and a module case including a lower plate, a side plate and an upper plate to form an inner space so that the cell assembly is accommodated therein, the module case including a trap unit formed in at least a part of an inner surface of the side plate to be concave outward, the trap unit being formed to be biased in a front or rear direction.