Cooling device and power supply

A power supply comprising:

• a battery mounted on a vehicle;
• and
• a cooling device for cooling the battery;
• wherein the battery comprises a plurality of unit cells and a battery case containing the plurality of unit cells,
• the cooling device comprises:
• an air supply channel achieving fluid communication between a vehicle interior or an outside of the vehicle and an inner part of the battery case,
• an air supply system for supplying a volume of air via the air supply channel to the inner part of the battery case;
• a filter member disposed in the air supply channel;
• and
• a control system,
• the air supply system comprises a fan and a motor for driving the fan, the motor being driven by a constant voltage system,
• the control system comprises a current value detecting portion and a judging portion,
• the current value detecting portion detects a current value of an electric current supplied to the motor, and
• the judging portion compares the current value detected by the current value detecting portion and a preset reference current value and, when the detected current value is lower than the preset reference current value, judges that a load on the motor has decreased, wherein the judging portion determines from the decreased load on the motor that there is an anomaly in the volume of the air supplied to the battery case and outputs a warning signal, and
• wherein the reference current value is set based on the current value of the electric current supplied to the motor when the fan is driven while an unused filter member is provided.