Long-term energy storage assembly comprising an intermediate connection part

A method for assembling an electrical energy storage assembly comprising an envelope having a so-called side wall and two bottom walls each positioned at one end of the side wall, and a capacitive element intended to be contained in the envelope,

• wherein the method comprises at least the following steps:
• first positioning an electrically conductive intermediate connection part on the capacitive element, the intermediate connection part comprising a covering plate including at least one vent for the passing of a fluid, the intermediate connection part being positioned so that the covering plate covers the end of the capacitive element, then joining the covering plate to the capacitive element in particular by welding;
• secondly positioning a part of the envelope comprising a bottom wall of the envelope, in particular a cover on the intermediate connection part and joining the intermediate connection part to the part of envelope so as to allow deformation of the bottom wall relative to the intermediate connection part, in particular by gluing, brazing or welding,
• these steps being performed so that the intermediate connection part is placed between the capacitive element and the bottom wall.