Capacitive energy-storage for a mobile working machine

A capacitive energy-storage for storing direct voltage, the capacitive energy-storage comprising:

• a capacitor system comprising at least two electrically interconnected capacitor modules each comprising a cooling duct system, one of the capacitor modules being a first capacitor module, and
• a piping connecting the cooling duct systems of the capacitor modules to each other to enable the capacitive energy-storage to be connected to an external coolant circulation system,
• wherein each of the at least two electrically interconnected capacitor modules comprises:
• a capacitor element configured to be cooled by the cooling duct system of the capacitor module,
• a first voltage terminal connected to a first pole of the capacitor element,
• a second voltage terminal connected to a second pole of the capacitor element, and
• a housing encapsulating the capacitor element and the cooling duct system, the housing comprising
• wiring lead-throughs for the first and second voltage terminals, and
• piping lead-throughs for the cooling duct system,
• wherein at least one of the capacitor modules comprises one or more inductor coils inside the housing of the at least one capacitor module and configured to smooth current of the at least one capacitor module, each of the inductor coils being connected between a pole of the first voltage terminal of the at least one capacitor module and the first pole of the capacitor element of the at least one capacitor module so that the first pole of the capacitor element of the at least one capacitor module is connected to the pole of the first voltage terminal of the at least one capacitor module via the respective inductor coil, and
• wherein walls of the cooling duct system isolate an interior space of the cooling duct system from space surrounding the cooling duct system inside the housing.

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 that comprises:
• a capacitor system comprising at least two electrically interconnected capacitor modules each comprising a cooling duct system, one of the capacitor modules being a first capacitor module, and
• a piping connecting the cooling duct systems of the capacitor modules to each other so as to enable the capacitive energy-storage to be connected to an external coolant circulation system,
• wherein each of the at least two electrically interconnected capacitor modules comprises:
• a capacitor element configured to be cooled by the cooling duct system of the capacitor module under consideration,
• a first voltage terminal connected to a first pole of the capacitor element,
• a second voltage terminal connected to a second pole of the capacitor element, and
• a housing encapsulating the capacitor element and the cooling duct system, the housing comprising
• wiring lead-throughs for the first and second voltage terminals, and
• piping lead-throughs for the cooling duct system,
• wherein at least one of the capacitor modules comprises one or more inductor coils inside the housing of the at least one capacitor module and configured to smooth current of the at least one capacitor module, each of the inductor coils being connected between a pole of the first voltage terminal of the at least one capacitor module and the first pole of the capacitor element of the at least one capacitor module so that the first pole of the capacitor element of the at least one capacitor module is connected to the pole of the first voltage terminal of the at least one capacitor module via the respective inductor coil, and
• wherein walls of the cooling duct system isolate interior space of the cooling duct system from space surrounding the cooling duct system inside the housing.