Cooling sheet, battery module, battery pack, and device including battery pack

A battery pack according to an embodiment of the present invention comprises: a battery module comprising a battery cell stack in which a plurality of battery cells are stacked; a battery pack frame that accommodates the battery module; and a heat sink located between the body of the battery cell stack and the battery pack frame, in which a cooling fin is arranged between two adjacent battery cells, the cooling fin includes a main body in contact with the battery cells and an extension portion extending to an upper side (z-axis) of a body of the battery cell stack and positioned adjacent to the heat sink, and the extension portion has a bent portion formed by bending in a direction different from the upper side (z-axis). 根据本发明的实施例所述的电池组包括：电池模块，所述电池模块包括电池单体堆，多个电池单体被堆叠在所述电池单体堆中；电池组框架，所述电池组框架容纳所述电池模块；和散热器，所述散热器位于所述电池单体堆的本体和所述电池组框架之间，其中，冷却片被布置在两个相邻的电池单体之间，所述冷却片包括与所述电池单体相接触的主体和延伸到所述电池单体堆的本体的上侧(z轴)并且定位成与所述散热器相邻的延伸部分，并且所述延伸部分具有通过在不同于所述上侧(z轴)的方向上弯折而形成的弯折部分。