BATTERY PACK, BATTERY RACK COMPRISING SAME, AND POWER STORAGE SYSTEM

Disclosed is a battery pack with reduced risk of fire propagation or explosion. To achieve the above-described object, the battery pack according to the present disclosure includes at least one cell assembly including a plurality of secondary batteries stacked in a direction, a module housing having an internal space in which the at least one cell assembly is received, and a spacer member interposed between the plurality of secondary batteries, and configured to press the plurality of secondary batteries in two directions to space the plurality of secondary batteries apart when a temperature of at least one of the plurality of secondary batteries is equal to or higher than a predetermined temperature.