An electrochemical assembly of the type comprising a first stack of electrochemical elements provided with a first electrical connection tab with a first polarity, the first stack of electrochemical elements extending along a stacking plane, a first common connection element adapted to electrically connect the first electrical connection tab to an electrical connection terminal with the first polarity, the first common connection element comprising a first electrical connection rib fastened to the first electrical connection tab, the electrochemical assembly comprising a first support element, the first electrical connection tab being arranged between the first electrical connection rib and the first support element, the electrochemical assembly comprising a second stack of electrochemical elements provided with a second electrical connection tab with the first polarity, the second stack of electrochemical elements extending along the stacking plane, the first common connection element electrically connecting the first electrical connection tab and the second electrical connection tab and is suitable for connecting the second electrical connection tab to the electrical connection terminal with the first polarity, the first common connection element comprising a second electrical connection rib fastened to the second electrical connection tab, the electrochemical assembly comprising a second support element, the second electrical connection tab being arranged between the second electrical connection rib and the second support element, characterized in that the electrochemical assembly comprises a first support element which forms the first support element and the second support element and which comprises at least one central core arranged between the first support element and the second support element. a first stack of electrochemical elements provided with a first electrical connection tab with a first polarity, the first stack of electrochemical elements extending along a stacking plane, a first common connection element adapted to electrically connect the first electrical connection tab to an electrical connection terminal with the first polarity, the first common connection element comprising a first electrical connection rib fastened to the first electrical connection tab, the electrochemical assembly comprising a first support element, the first electrical connection tab being arranged between the first electrical connection rib and the first support element, a second stack of electrochemical elements provided with a second electrical connection tab with the first polarity, the second stack of electrochemical elements extending along the stacking plane, the first common connection element electrically connecting the first electrical connection tab and the second electrical connection tab and is suitable for connecting the second electrical connection tab to the electrical connection terminal with the first polarity, the first common connection element comprising a second electrical connection rib fastened to the second electrical connection tab, the electrochemical assembly comprising a second support element, the second electrical connection tab being arranged between the second electrical connection rib and the second support element, characterized in that the electrochemical assembly comprises a first support element which forms the first support element and the second support element and which comprises at least one central core arranged between the first support element and the second support element.