The present invention relates to an energy storage module for an apparatus for supplying voltage of a motor vehicle, wherein the energy storage module comprises a plurality of prismatic storage cells which are stacked in at least one row, are arranged one behind the other and are braced between at least two end plates by means of at least one tie rod, wherein at least one of the end plates has a layer structure comprising at least three successive layers, wherein two outer layers surround at least one inner layer, and wherein the inner layer has a wavy and/or diffuse structure.