A battery pack having improved heat dissipation performance is provided. A battery pack includes battery cells; a module accommodating the battery cells and including heat dissipation members located between neighboring battery cells of the battery cells; and a duct to supply the module with coolant or absorb coolant from the module, and each of the heat dissipation members has a first region and a second region opposite to the first region, the first region having a smaller height than the second region to establish a path of the coolant.