BATTERY PACK

A battery pack of the present disclosure includes: battery cells each including a terminal surface on which an electrode terminal is formed, a top surface which is opposite the terminal surface, and a lateral surface which is between the terminal surface and the top surface; a first tank facing the terminal surfaces of the battery cells; a second tank extending from the first tank and facing the lateral surfaces of the battery cells; and a third tank extending from the second tank and facing the top surfaces of the battery cells, and cavity may be formed in the first to third tanks to extend across the first to third tanks, and the cavity may be filled with a first cooling medium and may be fluidically isolated from outside of the battery pack, and a cooling tube may be accommodated in the third tank to extend across the cavity, and the cooling tube may accommodate flow of a second cooling medium different from the first cooling medium. According to the present disclosure, the battery pack is improved in heat dissipation efficiency by using a liquid cooling medium contained to face different surfaces of the battery pack and is configured to realize high heat dissipation efficiency with low costs through a simple heat dissipation structure.