NOVELTY - The battery module comprises: a set of battery cells that are adhered closely with each other; a set of heat transfer members that are separated in a fixed interval and are respectively interposed between battery cells; and a phase change material embedded to the battery cells, where the cells are laminated in both sides. The heat transfer member is divided into multiple parts with spherical shape. The battery cells and the heat transfer members embedded with the phase change material are arranged in an inner portion of a housing of the battery module.    USE - The battery module is useful in a secondary battery that is used as an energy source in a wireless mobile apparatus including mobile phone, an electric vehicle, a hybrid electric vehicle and a plug-in hybrid electric vehicle.    ADVANTAGE - The battery module maintains the heat transmission of the neighboring battery cells, and minimizes the temperature deflection between the neighboring battery cells. The phase change material absorbs the heat generated in the battery cell. The heat transfer member is divided into multiple parts, so that the heat transfer member can be easily installed in a narrow space. The heat flowing into the heat transfer member is transferred into outside, thus maximizing the cooling effect of the battery cells.    DETAILED DESCRIPTION - The battery module comprises: a set of battery cells that are adhered closely with each other; a set of heat transfer members that are separated in a fixed interval and are respectively interposed between battery cells; and a phase change material embedded to the battery cells, where the cells are laminated in both sides. The heat transfer member is divided into multiple parts with spherical shape. The battery cells and the heat transfer members embedded with the phase change material are arranged in an inner portion of a housing of the battery module. An end the heat transfer member is coupled to one side of the inner portion the housing, and the other end is connected with the other side of the inner portion of the housing.