Battery module, battery pack including battery module, and vehicle including battery pack

A battery module, comprising:

• a plurality of battery cells stacked on one another;
• a cell housing configured to accommodate the plurality of battery cells;
• a top plate configured to cover an entire upper side of the cell housing and electrically connected to one of positive electrodes and negative electrodes of the plurality of battery cells;
• a bottom plate disposed to face the top plate and configured to cover an entire lower side of the cell housing and electrically connected to the other of the positive electrodes and the negative electrodes of the plurality of battery cells;
• a phase change material filled in the cell housing so that the plurality of battery cells are partially submerged therein to a certain level and configured to guide cooling of the plurality of battery cells;
• and
• a heatsink mounted to an upper side of the top plate to cool the plurality of battery cells, wherein the phase change material is vaporized and moves toward the top plate when a temperature of the plurality of battery cells is raised, and is liquefied by the heatsink and moves toward the bottom plate, and
• wherein the battery module further comprises a guide rib provided at an upper side of an inner wall of the cell housing above the certain level to guide movement of the liquefied phase change material toward the bottom plate.