Capacitor module

A capacitor module for a vehicle, wherein the module comprises:

• a capacitor comprising a plurality of capacitor cells operatively connected to each other,
• a first port for being connected to a power supply arrangement,
• a second port for being connected to an electric machine for cranking an internal combustion engine, and
• a third port for being connected to ground, and
• wherein the capacitor module comprises a first electrical device connected between the first port and the capacitor and wherein the first electrical device is adapted for allowing a current to flow out from the capacitor module via the first port for providing power to at least one load during operation in case of a sudden voltage drop in the power supply from the power supply arrangement,
• wherein the first electrical device is arranged for providing a low resistance against the current in one direction and a high resistance in the other direction,
• wherein the first electrical device forms a switch, which is adapted to be automatically controlled based on a parameter indicative of voltage or current, and
• wherein the first electrical device is adapted to be automatically switched off if an inrush current to the capacitor exceeds a certain pre-defined threshold value but allow any discharge current from the capacitor to the electrical system.