Refrigeration system having a cooling body with coolant flowing through it for cooling a battery

The system (1) has a first line (5) for supplying coolant to a heat sink (2) and a second line (12) for discharging coolant from the heat sink. A casing element (6) partially surrounds the first and second lines and a central battery (4), so that a closed volume chamber (7) is formed between the casing element and path of the coolant flowing through the central battery, the first and second lines. The casing element is formed of a thermally insulating material. The casing element includes an element for detection of moisture within the volume chamber.