A battery module, comprising: a module body including a cell assembly stack formed by stacking a plurality of cell assemblies and a module case configured to accommodate the cell assembly stack; and a pair of heatsinks disposed at an upper portion and a lower portion of the module body to dissipate heat transferred from the module case, wherein the cell assembly includes: at least one battery cell being a pouch-type battery cell that includes an electrode assembly, a pouch case, a pair of electrode leads, and a pair of sealants interposed between an inner surface of the pouch case and the electrode lead; a cartridge configured to accommodate the battery cell; and a pair of thermally conductive resin layers filled in empty spaces formed between a top end of the battery cell and the cartridge and between a bottom end of the battery cell and the cartridge, wherein the cartridge has a rectangular parallelepiped frame shape with both open sides and an empty inside to accommodate one battery cell or a cell stack formed by stacking the at least one battery cells, and an outer surface of the battery cell or of the cell stack is in contact with an inner surface of the cartridge or an insulation sheet is interposed between an outer surface of the battery cell or of the cell stack and an inner surface of the cartridge, wherein the top end and the bottom end of the battery cell are in contact with the thermally conductive resin layer, and wherein the battery module further comprises a pair of thermal interface material layers interposed between the module body and the heatsink in order to completely fill the empty space between the module body and the heatsink. a module body including a cell assembly stack formed by stacking a plurality of cell assemblies and a module case configured to accommodate the cell assembly stack; and a pair of heatsinks disposed at an upper portion and a lower portion of the module body to dissipate heat transferred from the module case, wherein the cell assembly includes: at least one battery cell being a pouch-type battery cell that includes an electrode assembly, a pouch case, a pair of electrode leads, and a pair of sealants interposed between an inner surface of the pouch case and the electrode lead; a cartridge configured to accommodate the battery cell; and a pair of thermally conductive resin layers filled in empty spaces formed between a top end of the battery cell and the cartridge and between a bottom end of the battery cell and the cartridge, wherein the cartridge has a rectangular parallelepiped frame shape with both open sides and an empty inside to accommodate one battery cell or a cell stack formed by stacking the at least one battery cells, and an outer surface of the battery cell or of the cell stack is in contact with an inner surface of the cartridge or an insulation sheet is interposed between an outer surface of the battery cell or of the cell stack and an inner surface of the cartridge, wherein the top end and the bottom end of the battery cell are in contact with the thermally conductive resin layer, and wherein the battery module further comprises a pair of thermal interface material layers interposed between the module body and the heatsink in order to completely fill the empty space between the module body and the heatsink. at least one battery cell being a pouch-type battery cell that includes an electrode assembly, a pouch case, a pair of electrode leads, and a pair of sealants interposed between an inner surface of the pouch case and the electrode lead; a cartridge configured to accommodate the battery cell; and a pair of thermally conductive resin layers filled in empty spaces formed between a top end of the battery cell and the cartridge and between a bottom end of the battery cell and the cartridge, wherein the cartridge has a rectangular parallelepiped frame shape with both open sides and an empty inside to accommodate one battery cell or a cell stack formed by stacking the at least one battery cells, and an outer surface of the battery cell or of the cell stack is in contact with an inner surface of the cartridge or an insulation sheet is interposed between an outer surface of the battery cell or of the cell stack and an inner surface of the cartridge, wherein the top end and the bottom end of the battery cell are in contact with the thermally conductive resin layer, and wherein the battery module further comprises a pair of thermal interface material layers interposed between the module body and the heatsink in order to completely fill the empty space between the module body and the heatsink.