Battery penetration device for fighting fires in electric vehicle

The object of the invention is to provide a device to reduce the temperature in a battery pack installed in an electrical vehicle, such that a fire hazard can be reduced by cooling the battery pack. The present invention addresses this by providing a battery penetration device for reducing the temperature in at least one battery in a battery pack. The battery penetration device comprises a tube having a fluid inlet for fluid, and a nail is arranged in a first end of said tube. The nail is configured to rotate relative to a longitudinal axis of said tube, such that the nail is capable of entering said battery pack. The nail has at least one fluid outlet. The fluid inlet is in fluid communication with said fluid outlet, such that fluid is capable of entering said battery pack and thereby reducing the temperature inside the battery pack when cooling the battery pack with said fluid.