Battery module, battery pack and energy storage system

The embodiment of the invention discloses a battery module, a battery pack and an energy storage system, relates to the technical field of energy, and solves the problems of high cost and large occupied space when temperature equalization of battery cells in the battery module is realized. According to the specific scheme, the battery module is provided, and the battery module comprises a heat conduction part and a plurality of battery cells. Wherein the heat conduction part is attached to the surfaces of at least two battery cells in the plurality of battery cells, and the area of the heat conduction part is smaller than that of the attaching surfaces of the at least two battery cells. 本申请实施例公开了一种电池模组、电池包和储能系统，涉及能源技术领域，解决了实现电池模组中电芯的均温时，成本高占用空间多的问题。具体方案为，提供一种电池模组，该电池模组包括导热部件和多个电芯。其中，导热部件与多个电芯中至少两个电芯的表面贴合，且导热部件的面积小于至少两个电芯贴合面的面积。