The present invention relates to an energy storage module (1) for a device for voltage supply, in particular to a motor vehicle, comprising a plurality of prismatic storage cells (10), which are arranged in series, stacked to form at least one row (60, 61), and are braced between two end plates (30, 35) via tensioning elements (40-42), wherein at least one of the two end plates (30, 35) comprises at least one cutout (107) for inserting a fastening means (101) for fastening the energy storage module in the device (100), and wherein the cutout (107) is formed in the interior of the end plate (30, 35).