Battery-Cooling Apparatus, and Method for Detecting a Thermal Runaway of a Battery Cell Via Said Battery-Cooling Apparatus

A battery-cooling apparatus for a motor vehicle includes a temperature-control circuit for circulation of coolant for temperature control of battery cells, a coolant expansion tank which is incorporated into the temperature-control circuit, and an excess-pressure-detection device which is arranged at least partially in and/or on the coolant expansion tank and which detects exceedance of a particular pressure in the coolant expansion tank. A method detects a thermal runaway of a battery cell via the battery-cooling apparatus.