A battery pack comprising: a plurality of cartridges configured to be stackable in a vertical direction, each cartridge of the plurality of cartridges extending in a longitudinal direction perpendicular to the vertical direction; and a plurality of battery cells that are vertically arranged in contact with adjacent battery cells, wherein each battery cell is disposed in a cartridge of the plurality of cartridges, wherein each cartridge of the plurality of cartridges includes: a battery cell contact body that is configured to contact a battery cell of the plurality of battery cells and support the battery cell, and at least one duct (D1, D2) that is configured to transmit heat from the battery cell contact body to air by passing air through the at least one duct (D1, D2), and wherein each duct (D1, D2) of the plurality of cartridges is configured to communicate air with another duct (D1, D2) of an adjacent cartridge, and wherein the battery cell contact body includes: a pair of contact portions (23, 24) protruding from the ducts (D1, D2) and a pair of bridges (25, 26) connecting the contact portions (23, 24), wherein the contact portions (23, 24) are in contact with a pair of battery cells, such that the battery cell contact body can receive heat from the battery cells. a plurality of cartridges configured to be stackable in a vertical direction, each cartridge of the plurality of cartridges extending in a longitudinal direction perpendicular to the vertical direction; and a plurality of battery cells that are vertically arranged in contact with adjacent battery cells, wherein each battery cell is disposed in a cartridge of the plurality of cartridges, wherein each cartridge of the plurality of cartridges includes: a battery cell contact body that is configured to contact a battery cell of the plurality of battery cells and support the battery cell, and at least one duct (D1, D2) that is configured to transmit heat from the battery cell contact body to air by passing air through the at least one duct (D1, D2), and wherein each duct (D1, D2) of the plurality of cartridges is configured to communicate air with another duct (D1, D2) of an adjacent cartridge, and wherein the battery cell contact body includes: a pair of contact portions (23, 24) protruding from the ducts (D1, D2) and a pair of bridges (25, 26) connecting the contact portions (23, 24), wherein the contact portions (23, 24) are in contact with a pair of battery cells, such that the battery cell contact body can receive heat from the battery cells. a battery cell contact body that is configured to contact a battery cell of the plurality of battery cells and support the battery cell, and at least one duct (D1, D2) that is configured to transmit heat from the battery cell contact body to air by passing air through the at least one duct (D1, D2), and wherein each duct (D1, D2) of the plurality of cartridges is configured to communicate air with another duct (D1, D2) of an adjacent cartridge, and wherein the battery cell contact body includes: a pair of contact portions (23, 24) protruding from the ducts (D1, D2) and a pair of bridges (25, 26) connecting the contact portions (23, 24), wherein the contact portions (23, 24) are in contact with a pair of battery cells, such that the battery cell contact body can receive heat from the battery cells. a pair of contact portions (23, 24) protruding from the ducts (D1, D2) and a pair of bridges (25, 26) connecting the contact portions (23, 24), wherein the contact portions (23, 24) are in contact with a pair of battery cells, such that the battery cell contact body can receive heat from the battery cells.