BATTERY MODULE

A battery module includes: one or more cell assemblies; a main housing comprising a main boundary portion surrounding an accommodation space in which the one or more cell assemblies are positioned; a first plate comprising a first boundary portion coupled with the main boundary portion and a first exposure portion exposed from the main boundary portion and defining a side of a cooling fluid passage for cooling the accommodation space; and a second plate facing the first plate and comprising a second boundary portion coupled with the main boundary portion and a second exposure portion exposed from the main boundary portion and defining an other side of the cooling fluid passage.