The application relates to a stackable
battery pack, which comprises a rectangular shell and an upper cover, the upper cover covers the top of the rectangular shell, each end corner of the upper cover is provided with a groove for stack connection, each end corner of the bottom of the rectangular shell is provided with a
convex structure for stack connection, the groove and the
convex structure are matched, when a plurality of the battery packs are vertically stacked, the
convex structure of one of the two adjacent battery packs is accommodated in the groove of the other
battery pack. The application sets the groove on the upper cover and the corresponding convex structure on the shell, and the multiple
battery pack units are stably stacked together through vertical stacking instead of side-by-side placement, without additional support frames or fixing devices, which not only saves the installation space and hardware cost, but also significantly improves the stability and safety of the whole
system, has high practicability and economy, and has a wide application range, and can be produced and used as a general product.