Onboard charging system including a heat exchanger

An onboard charging system comprising:

• an onboard battery that is configured to be mounted on a vehicle and used to drive the vehicle;
• a vehicle-side coupling unit that is configured to make a charging current path to an outside-vehicle power feeding apparatus by being coupled to an apparatus-side coupling unit of the outside-vehicle power feeding apparatus;
• a heat exchanger that is provided in the vehicle-side coupling unit and configured to perform heat exchange between the vehicle-side coupling unit and the apparatus-side coupling unit;
• a second heat exchanger that is provided in the apparatus-side cooling unit and configured to perform heat exchange between the vehicle-side coupling unit and the apparatus-side coupling unit;
• a controller that is configured to perform ON/OFF control of a function of the heat exchange performed by the heat exchanger;
• and
• a charger that is configured to charge the onboard battery by using the charging current path,
• wherein a function of the heat exchange performed by the controller includes reversing a flow of the heat exchange between the heat exchanger and the second heat exchanger,
• wherein a vehicle-side temperature sensor that is configured to measure a temperature of the heat exchanger is provided,
• wherein an apparatus-side temperature sensor that is configured to measure a temperature of the second heat exchanger is provided, and
• wherein the controller chances the flow between the heat exchanger and the second heat exchanger such that the flow is in a direction from the one of the heat exchanger and the second heat exchanger having a higher temperature.