Energy storage device for an electrically powered motor vehicle

The invention relates, inter alia, to an energy storage device () for an electrically powered motor vehicle. A first support element () is arranged between one end () of a stiffening strut () and a battery housing (). The first support element () supports the stiffening strut () on the battery housing (), wherein a cross-section of the first support element () increases from the end () of the stiffening strut () towards the battery housing (). A second support element () is arranged between a battery cell stack end side () and the battery housing (). The second support element () supports the battery cell stack () on the battery housing (), wherein a cross-section of the second support element () decreases from the battery cell stack end side () towards the battery housing ().