Capacitor module for a mobile working machine

A mobile working machine comprising:

• a combustion engine, and
• an electromechanical power transmission chain between the combustion engine and one or more actuators of the mobile working machine,
• wherein the electromechanical power transmission chain comprises a capacitive energy-storage comprising at least one capacitor module that comprises:
• capacitor elements each comprising electrical terminals,
• a cooling structure for cooling the capacitor elements, the electrical terminals of the capacitor elements being mechanically connected to the cooling structure to be in heat-conductive relations with the cooling structure,
• flexible connection elements made of electrically conductive material, at least one of the electrical terminals of each of the capacitor elements being mechanically connected to the cooling structure via one of the flexible connection elements so as to allow the electrical terminal under consideration to move with respect to the cooling structure,
• an electrically insulating membrane between the cooling structure and one or more of the flexible connection elements,
• one or more connection plates made of electrically conductive material and arranged to provide galvanic connections between the capacitor elements so that one ends of the flexible connection elements are pressed between the connection plates and the electrically insulating membrane, and
• one or more insulator plates comprising electrically insulating material, and pressing devices for pressing the insulator plates towards the cooling structure so that the connection plates are pressed between the insulator plates and the ends of the flexible connection elements.