BATTERY PACK

A battery pack includes: a plurality of battery cells each including a terminal surface on which a terminal unit is arranged, a bottom surface opposite the terminal surface, and first and second side surfaces connecting the terminal surface to the bottom surface; and pack cases accommodating the plurality of battery cells in two rows such that the bottom surfaces face each other, and including a flow path plate which is between the bottom surfaces of the battery cells in the two rows, and including a plurality of flow paths accommodating a flow of a cooling medium, and first and second tank plates which define first and second connection tanks, respectively, that are fluidly connected to the plurality of flow paths, and which extend across the flow path plate from upper and lower portions of the flow path plate, respectively, to cover the first and second side surfaces.