BATTERY PACK

A battery pack (1) is provided with: a battery module (10) having a cell stack (20) configured by stacking a plurality of cells; and a cooling mechanism (90) for cooling the battery module (10). The cooling mechanism (90) is a refrigerant flow passage (91) through which a liquid medium (W) passes. The cell stack (20) and the refrigerant flow passage (91) are arranged with a bottom plate (60) interposed therebetween. A plurality of protrusions (61) are provided on the lower surface (60a) of the bottom plate (60). The plurality of protrusions (61) are arranged in a staggered pattern along the stacking direction of the cells. 一种蓄电池封装体(1)，其具备：蓄电池模块(10)，其具有通过层叠多个单体而构成的单体层叠体(20)；以及冷却机构(90)，其冷却蓄电池模块(10)。冷却机构(90)是供液状介质(W)通过的冷却介质流路(91)，单体层叠体(20)及冷却介质流路(91)夹着底座板(60)而配置。在底座板(60)的下表面(60a)设置有多个凸部(61)，多个凸部(61)沿着单体的层叠方向以交错状配置。